A cobalt-containing high-speed steel and its preparation method

Abstract

The present invention relates to the technical field of high-speed steel, and specifically relates to a cobalt-containing high-speed steel and a preparation method thereof, comprising the following steps: weighing raw materials according to parts by weight: 55-60 parts of Fe, 2-5 parts of Mo, 2-4 parts of W, 0.5-0.8 parts of V, 0.2-0.5 parts of Co, 0.1-0.2 parts of C, and 0.1-0.2 parts of rare earth elements. The cobalt-containing high-speed steel of the present invention achieves ideal metallographic structure and processing performance technical indicators through precise control of the contents of alloying elements such as C, Mo, W, V, and Co, so as to ensure ideal wear resistance and hardness after heat treatment, optimize the balance and coordination improvement of the wear resistance, impact resistance, and hardness of the product, and significantly improve the corrosion resistance, heat and cold resistance stability of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of high-speed tool steel, and particularly to a cobalt-containing high-speed tool steel and a preparation method thereof. Background Art

[0002] High-speed tool steel is a complex steel type with a carbon content generally between 0.70% and 1.65%. Also known as high-speed steel, it is a high-carbon and high-alloy ledeburite steel mainly used as high-speed cutting tools for machine tools. In order to improve the wear resistance of existing high-speed tool steel products, it is likely to affect the impact resistance of the products. At the same time, it is very difficult to balance and coordinate the improvement of the wear resistance, impact resistance and hardness of the products, and the corrosion resistance, heat and cold stability of the products are poor, which limits the use efficiency of the products. Summary of the Invention

[0003] Aiming at the defects of the existing technology, the purpose of the present invention is to provide a cobalt-containing high-speed tool steel and a preparation method thereof to solve the problems raised in the above background art.

[0004] The present invention adopts the following technical solutions to solve the technical problems:

[0005] The present invention provides a preparation method of cobalt-containing high-speed tool steel, including the following steps:

[0006] Step 1: Weigh raw materials according to parts by weight:

[0007] 55 - 60 parts of Fe, 2 - 5 parts of Mo, 2 - 4 parts of W, 0.5 - 0.8 parts of V, 0.2 - 0.5 parts of Co, 0.1 - 0.2 parts of C, 0.1 - 0.2 parts of rare earth elements;

[0008] Step 2: Completely melt Fe, Mo, W, V, Co and C in Step 1 to form a molten solution, then add rare earth elements and continue melting for 1 - 2 h to obtain a casting solution;

[0009] Step 3: Inject the casting solution into a metal mold preheated to 200 - 250 °C for casting to obtain an ingot blank;

[0010] Step 4: Immerse the ingot blank into a sufficient amount of an immersion conditioner modified based on hydroxyapatite for ultrasonic immersion conditioning treatment. The ultrasonic immersion conditioning power is 350 - 400 W, the ultrasonic time is 20 min. After the immersion conditioning is completed, filter by suction and dry to obtain an immersion-conditioned ingot blank;

[0011] Step 5: Perform solution treatment on the immersion-conditioned ingot blank, and then perform aging treatment;

[0012] Step 6: Coat the surface of the ingot blank treated in Step 5 with a modified liquid until the surface of the ingot blank is wetted, and then perform induction heating treatment to obtain cobalt-containing high-speed tool steel.

[0013] Preferably, the rare earth element is a mixture of neodymium, gadolinium and scandium in a weight ratio of 2:1:1;

[0014] The temperature of the solution treatment is 500-540°C for 1-2 hours; the temperature of the aging treatment is 350-380°C for 10-20 hours;

[0015] Induction heating treatment adopts distributed induction heating treatment. The specific induction heating method is:

[0016] First, induction heating was performed at 790-800°C for 2 h, then the temperature was lowered to 550-560°C at a rate of 1-3°C / min, induction heating was performed for 1 h, and finally air-cooled to room temperature.

[0017] Preferably, the preparation method of the hydroxyapatite-modified infusion agent is:

[0018] S01: First, stir the hydroxyapatite in a sufficient amount of 5% potassium permanganate solution, then wash, filter and dry. Preheat the dried hydroxyapatite to 60°C and keep it warm.

[0019] S02: 3-5 parts of hydroxyapatite treated with S01, 1-2 parts of stearic acid, 0.02-0.03 parts of manganese powder, 0.02-0.03 parts of chromium powder and 5-8 parts of sodium alginate solution are fully mixed, and then filtered and dried to obtain a hydroxyapatite-based conditioning agent;

[0020] S03: heat-treating kaolin at 150-160° C. for 10-20 min, then air-cooling to room temperature, and fully blending 3-5 parts of heat-treated kaolin, 1-3 parts of aluminum borate whiskers, 5-8 parts of chitosan solution, and 2-3 parts of sodium dodecylbenzene sulfonate to obtain a kaolin composite whisker solution;

[0021] S04: ultrasonically treat a hydroxyapatite-based conditioning agent and a kaolin compound whisker solution at a weight ratio of 2:5 to obtain a hydroxyapatite-modified conditioning agent.

[0022] The leaching agent based on hydroxyapatite modification is prepared by activating hydroxyapatite with a potassium permanganate solution, followed by preheating and thoroughly blending with stearic acid, manganese powder, chromium powder, and sodium alginate solution to obtain a hydroxyapatite-based regulator. Through the coordination and adjustment of raw materials and the synergistic enhancement by kaolin complexed with whisker solution, during ultrasonic leaching, combined with solution treatment and aging treatment, the performance of the product is enhanced. The kaolin complexed with whisker solution is obtained by thermally improving lamellar kaolin and then coordinating and adjusting with aluminum borate whisker, chitosan solution, and sodium dodecylbenzenesulfonate. With the whisker structure of aluminum borate whisker, sodium dodecylbenzenesulfonate, chitosan solution, and kaolin are coordinated, and then the obtained kaolin complexed with whisker solution further synergistically improves the hydroxyapatite-based regulator. After leaching the ingot blank with the hydroxyapatite-based leaching agent obtained by the coordination and cooperation of raw materials such as manganese powder and chromium powder, through thermal improvement treatment, the grain refinement and strengthening effect are enhanced, and the performance coordination and stability of the product are further improved.

[0023] Preferably, the mass fraction of the sodium alginate solution is 2 - 5%; the mass fraction of the chitosan solution is 3 - 5%.

[0024] Preferably, the ultrasonic power of the ultrasonic treatment is 450 - 500 W, and the ultrasonic time is 20 - 30 min.

[0025] Preferably, the preparation method of the modification liquid is as follows:

[0026] S101: First irradiate wollastonite in a proton irradiation chamber for 10 - 15 min with an irradiation power of 350 - 400 W. After irradiation, the irradiated wollastonite agent is obtained;

[0027] The irradiated wollastonite agent, lanthanum chloride solution, and silane coupling agent KH550 are uniformly blended in a weight ratio of (3 - 4):5:1 to obtain a wollastonite active liquid;

[0028] S102: Add yttrium oxide to the regulator according to a weight ratio of 2:5, stir and adjust, and after stirring, filter and dry to obtain a regulated yttrium oxide body;

[0029] The regulated yttrium oxide body and the wollastonite active liquid are mixed and ball-milled in a weight ratio of 3:5. The ball-milling speed is 1000 - 1500 r / min, and ball-milling is carried out for 2 h. After ball-milling, the modification liquid is obtained.

[0030] Preferably, the stirring temperature for the stirring and adjustment treatment is 55 - 60 °C, the stirring speed is 350 - 400 r / min, and the stirring time is 1 h; the mass fraction of the lanthanum chloride solution is 2 - 5%.

[0031] Preferably, the regulator includes the following raw materials in parts by weight:

[0032] 2 - 3 parts of nano - titanium dioxide, 3 - 5 parts of 5% mass fraction dopamine hydrochloride solution, 1 - 1.5 parts of urea, 2 - 4 parts of flaky boron nitride, and 4 - 6 parts of 4% mass fraction sodium lignosulfonate solution.

[0033] The modification liquid uses wollastonite irradiated by proton to optimize its activity efficiency, and then is coordinated by lanthanum chloride solution and silane coupling agent KH550. Through the mutual coordination of raw materials, and further promoted by the coordinated yttrium oxide body. The regulated yttrium oxide body is prepared by the mutual blending of nano - titanium dioxide, 5% mass fraction dopamine hydrochloride solution, urea, flaky boron nitride, and 4% mass fraction sodium lignosulfonate solution. Using nano - titanium dioxide and flaky boron nitride as the matrix materials to improve wollastonite, strengthening the performance of the system through the acicular structure of wollastonite. At the same time, the regulated yttrium oxide body is blended, and then improved through induction heating treatment coordination, so that the product performance is further improved.

[0034] Preferably, the layer thickness of the flaky boron nitride is 2 - 3 nm; the sheet diameter is 1 - 3 µm.

[0035] The present invention also provides a cobalt - containing high - speed steel prepared by the preparation method of cobalt - containing high - speed steel.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] For the cobalt - containing high - speed steel of the present invention, through the precise control of the contents of alloying elements such as C, Mo, W, V, and Co, the ideal metallographic structure and processing performance technical indicators are achieved, thus ensuring ideal wear resistance, hardness after heat treatment, optimizing the balance and improvement of the wear resistance, impact resistance, and hardness of the product, and the product has remarkable corrosion resistance, heat and cold stability effects; the application of rare earth elements in high - speed steel has remarkable effects, which can refine grains, improve the wear resistance, hardness, and mechanical properties of high - speed steel, and can significantly enhance the corrosion resistance, heat and cold stability of the material. By immersing the high - speed steel into a sufficient amount of immersion agent modified by hydroxyapatite for ultrasonic immersion treatment and then coating the surface of the steel ingot blank with the modification liquid until the surface of the steel ingot blank is wetted, through the coordination and synergy of process raw materials, the wear resistance, impact resistance, and hardness of the obtained product are balanced and coordinated, and the product has remarkable corrosion resistance, heat and cold stability effects. Specific Embodiments

[0038] The following combines specific embodiments to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0039] A method for preparing a cobalt-containing high-tech steel in this embodiment comprises the following steps:

[0040] Step 1: weigh the raw materials according to weight:

[0041] Fe 55-60 parts, Mo 2-5 parts, W 2-4 parts, V 0.5-0.8 parts, Co 0.2-0.5 parts, C 0.1-0.2 parts, rare earth elements 0.1-0.2 parts;

[0042] Step 2: Smelt the Fe, Mo, W, V, Co and C in step 1 to form a melt, then add the rare earth element and continue smelting for 1-2 hours to obtain a casting liquid;

[0043] Step 3, injecting the casting liquid into a metal mold preheated to 200-250° C. for casting to obtain a steel ingot;

[0044] Step 4, immersing the steel ingot into a sufficient amount of a hydroxyapatite-modified immersion agent for ultrasonic immersion treatment, the ultrasonic immersion power is 350-400W, the ultrasonic time is 20min, and after the immersion is completed, the immersion is filtered and dried to obtain the immersion-treated steel ingot;

[0045] Step 5, performing a solution treatment on the leached steel ingot, and then performing an aging treatment;

[0046] Step six, coating the surface of the steel ingot processed in step five with the modifying liquid until the surface of the steel ingot is wetted, and then induction heating treatment is performed to obtain the cobalt-containing high-tech steel of the present invention.

[0047] The rare earth elements of this embodiment are neodymium, gadolinium, and scandium mixed in a weight ratio of 2:1:1;

[0048] The temperature of the solution treatment is 500-540°C for 1-2 hours; the temperature of the aging treatment is 350-380°C for 10-20 hours;

[0049] Induction heating treatment adopts distributed induction heating treatment. The specific induction heating method is:

[0050] First, induction heating was performed at 790-800°C for 2 h, then the temperature was lowered to 550-560°C at a rate of 1-3°C / min, induction heating was performed for 1 h, and finally air-cooled to room temperature.

[0051] The preparation method of the hydroxyapatite-modified infusion agent of this embodiment is as follows:

[0052] S01: First, stir the hydroxyapatite in a sufficient amount of 5% potassium permanganate solution, then wash, filter and dry. Preheat the dried hydroxyapatite to 60°C and keep it warm.

[0053] S02: Mix 3 - 5 parts of hydroxyapatite treated by S01, 1 - 2 parts of stearic acid, 0.02 - 0.03 parts of manganese powder, 0.02 - 0.03 parts of chromium powder and 5 - 8 parts of sodium alginate solution thoroughly, then filter by suction and dry to obtain a regulator based on hydroxyapatite;

[0054] S03: Heat - treat kaolin at 150 - 160 °C for 10 - 20 min, then air - cool to room temperature. Mix 3 - 5 parts of heat - treated kaolin, 1 - 3 parts of aluminum borate whiskers, 5 - 8 parts of chitosan solution and 2 - 3 parts of sodium dodecylbenzenesulfonate thoroughly to obtain a kaolin complex - adjusted whisker liquid;

[0055] S04: Ultrasonically treat the regulator based on hydroxyapatite and the kaolin complex - adjusted whisker liquid according to a weight ratio of 2:5 to obtain an immersion regulator modified by hydroxyapatite.

[0056] In this example, the mass fraction of the sodium alginate solution is 2 - 5%; the mass fraction of the chitosan solution is 3 - 5%.

[0057] In this example, the ultrasonic power of the ultrasonic treatment is 450 - 500 W, and the ultrasonic time is 20 - 30 min.

[0058] The preparation method of the modified liquid in this example is as follows:

[0059] S101: First irradiate wollastonite in a proton irradiation chamber for 10 - 15 min with an irradiation power of 350 - 400 W. After the irradiation ends, obtain an irradiated wollastonite agent;

[0060] Mix the irradiated wollastonite agent, lanthanum chloride solution and silane coupling agent KH550 evenly according to a weight ratio of (3 - 4):5:1 to obtain a wollastonite active liquid;

[0061] Add yttrium oxide to the regulator according to a weight ratio of 2:5, stir and adjust, then filter by suction and dry to obtain an adjusted yttrium oxide body;

[0062] Mix the adjusted yttrium oxide body and the wollastonite active liquid evenly according to a weight ratio of 3:5, perform ball - milling treatment at a ball - milling speed of 1000 - 1500 r / min for 2 h. After the ball - milling ends, obtain the modified liquid.

[0063] Preferably, the stirring temperature for the stirring and adjusting treatment is 55 - 60 °C, the stirring speed is 350 - 400 r / min, and the stirring time is 1 h; the mass fraction of the lanthanum chloride solution is 2 - 5%.

[0064] The regulator in this example includes the following raw materials in parts by weight:

[0065] 2 - 3 parts of nano - titanium dioxide, 3 - 5 parts of 5% hydrochloric acid dopamine solution by mass fraction, 1 - 1.5 parts of urea, 2 - 4 parts of flaky boron nitride, and 4 - 6 parts of 4% sodium lignosulfonate solution by mass fraction.

[0066] The layer thickness of the flaky boron nitride in this example is 2 - 3 nm; the sheet diameter is 1 - 3 µm.

[0067] The cobalt - containing high - speed steel prepared by the preparation method of cobalt - containing high - speed steel in this example.

[0068] Example 1

[0069] The preparation method of a cobalt - containing high - speed steel in this example includes the following steps:

[0070] Step 1, weigh raw materials according to parts by weight:

[0071] 55 parts of Fe, 2 parts of Mo, 2 parts of W, 0.5 part of V, 0.2 part of Co, 0.1 part of C, 0.1 part of rare earth element;

[0072] Step 2, melt Fe, Mo, W, V, Co, and C in Step 1 completely to form a melt, then add rare earth elements and continue melting for 1 - 2 h to obtain a casting liquid;

[0073] Step 3, pour the casting liquid into a metal mold preheated to 200 °C for casting to obtain an ingot blank;

[0074] Step 4, immerse the ingot blank in a sufficient amount of an immersion agent modified based on hydroxyapatite for ultrasonic immersion adjustment treatment. The ultrasonic immersion adjustment power is 350 W, the ultrasonic time is 20 min. After the immersion adjustment, filter by suction and dry to obtain an immersion - adjusted ingot blank;

[0075] Step 5, perform solution treatment on the immersion - adjusted ingot blank, and then perform aging treatment;

[0076] Step 6, coat the surface of the ingot blank processed in Step 5 with a modification liquid until the surface of the ingot blank is wetted, and then perform induction heating treatment to obtain the cobalt - containing high - speed steel of the present invention.

[0077] The rare earth element in this example is prepared by mixing neodymium, gadolinium, and scandium in a weight ratio of 2:1:1;

[0078] The temperature of the solution treatment is 500 °C for 1 hour; the temperature of the aging treatment is 350 °C for 10 hours;

[0079] The induction heating treatment adopts distributed induction heating treatment. The specific induction heating method is:

[0080] First, the sample was induction heated at 790 °C for 2 h, then cooled to 550 °C at a rate of 1 °C / min, induction heated for 1 h, and finally air-cooled to room temperature.

[0081] The preparation method of the hydroxyapatite-modified infusion agent of this embodiment is as follows:

[0082] S01: First, stir the hydroxyapatite in a sufficient amount of 5% potassium permanganate solution, then wash, filter and dry. Preheat the dried hydroxyapatite to 60°C and keep it warm.

[0083] S02: 3 parts of hydroxyapatite treated with S01, 1 part of stearic acid, 0.02 parts of manganese powder, 0.02 parts of chromium powder and 5 parts of sodium alginate solution are fully mixed, and then filtered and dried to obtain a hydroxyapatite-based conditioning agent;

[0084] S03: heat-treating kaolin at 150°C for 10 min, then air-cooling to room temperature, and fully blending 3 parts of heat-treated kaolin, 1 part of aluminum borate whisker, 5 parts of chitosan solution and 2 parts of sodium dodecylbenzene sulfonate to obtain a kaolin polytuning whisker solution;

[0085] S04: ultrasonically treat a hydroxyapatite-based conditioning agent and a kaolin compound whisker solution at a weight ratio of 2:5 to obtain a hydroxyapatite-modified conditioning agent.

[0086] The mass fraction of the sodium alginate solution is 2%; the mass fraction of the chitosan solution is 3%.

[0087] The ultrasonic power of the ultrasonic treatment in this embodiment is 450W, and the ultrasonic time is 20min.

[0088] The preparation method of the modified liquid of this embodiment is:

[0089] S101: irradiating the wollastonite in a proton irradiation box for 10 minutes at an irradiation power of 350 W, and obtaining an irradiated wollastonite agent after the irradiation is completed;

[0090] The irradiated wollastonite agent, lanthanum chloride solution and silane coupling agent KH550 are uniformly mixed in a weight ratio of 3:5:1 to obtain a wollastonite active solution;

[0091] S102: adding yttrium oxide to the regulator in a weight ratio of 2:5, stirring and regulating, and after stirring, filtering and drying to obtain a regulated yttrium oxide body;

[0092] The adjusted yttrium oxide body and wollastonite active liquid are mixed in a weight ratio of 3:5 and ball-milled at a ball-milling speed of 1000 r / min for 2 hours to obtain a modified liquid.

[0093] Preferably, the stirring temperature for the stirring adjustment treatment is 55 °C, the stirring speed is 350 r / min, and the stirring time is 1 h; the mass fraction of the lanthanum chloride solution is 2%.

[0094] The regulator of this example includes the following raw materials by weight:

[0095] 2 parts of nano-titanium dioxide, 3 parts of 5% hydrochloric acid dopamine solution, 1 part of urea, 2 parts of flaky boron nitride, and 4 parts of 4% lignosulfonate solution.

[0096] The flaky boron nitride in this example has a layer thickness of 2 nm; the sheet diameter is 1 µm.

[0097] Example 2

[0098] A preparation method of cobalt-containing high-speed steel in this example includes the following steps:

[0099] Step 1, weigh raw materials by weight:

[0100] 60 parts of Fe, 5 parts of Mo, 4 parts of W, 0.8 part of V, 0.5 part of Co, 0.2 part of C, 0.2 part of rare earth element;

[0101] Step 2, melt Fe, Mo, W, V, Co, and C in Step 1 completely to form a melt, then add rare earth elements and continue melting for 1 - 2 h to obtain a casting liquid;

[0102] Step 3, pour the casting liquid into a metal mold preheated to 250 °C for casting to obtain an ingot blank;

[0103] Step 4, immerse the ingot blank in a sufficient amount of an immersion regulator based on hydroxyapatite modification for ultrasonic immersion adjustment treatment, with an ultrasonic immersion adjustment power of 400 W and an ultrasonic time of 20 min. After the immersion adjustment is completed, filter and dry to obtain an immersion-adjusted ingot blank;

[0104] Step 5, perform solution treatment on the immersion-adjusted ingot blank, and then perform aging treatment;

[0105] Step 6, coat the surface of the ingot blank processed in Step 5 with a modification liquid until the surface of the ingot blank is wetted, and then perform induction heating treatment to obtain the cobalt-containing high-speed steel of the present invention.

[0106] The rare earth element in this example is prepared by mixing neodymium, gadolinium, and scandium in a weight ratio of 2:1:1;

[0107] The temperature of the solution treatment is 540 °C and the treatment time is 2 hours; the temperature of the aging treatment is 380 °C and the treatment time is 20 hours;

[0108] The induction heating treatment adopts distributed induction heating treatment, and the specific induction heating method is:

[0109] First, induction heating is carried out at a temperature of 800 °C for 2 h, then the temperature is decreased at a rate of 3 °C / min to 560 °C, induction heating is carried out for 1 h, and finally air cooling is carried out to room temperature.

[0110] The preparation method of the dipping agent based on hydroxyapatite modification in this embodiment is as follows:

[0111] S01: First, hydroxyapatite is fully stirred in a sufficient amount of 5% potassium permanganate solution by mass fraction, then washed with water, filtered by suction, dried, and the dried hydroxyapatite is preheated to 60 °C for heat preservation treatment;

[0112] S02: 5 parts of the hydroxyapatite treated in S01, 2 parts of stearic acid, 0.03 parts of manganese powder, 0.03 parts of chromium powder and 8 parts of sodium alginate solution are mixed thoroughly, then filtered by suction and dried to obtain a regulator based on hydroxyapatite;

[0113] S03: Kaolin is heat-treated at 160 °C for 20 min, then air-cooled to room temperature. 5 parts of the heat-treated kaolin, 3 parts of aluminum borate whiskers, 8 parts of chitosan solution and 3 parts of sodium dodecylbenzenesulfonate are mixed thoroughly to obtain a kaolin composite conditioning whisker liquid;

[0114] S04: The regulator based on hydroxyapatite and the kaolin composite conditioning whisker liquid are ultrasonically treated according to a weight ratio of 2:5 to obtain a dipping agent based on hydroxyapatite modification.

[0115] The mass fraction of the sodium alginate solution is 5%; the mass fraction of the chitosan solution is 5%.

[0116] The ultrasonic power of the ultrasonic treatment in this embodiment is 500 W, and the ultrasonic time is 30 min.

[0117] The preparation method of the modification liquid in this embodiment is as follows:

[0118] S101: Wollastonite is irradiated in a proton irradiation chamber for 15 min with an irradiation power of 400 W. After the irradiation is completed, an irradiated wollastonite agent is obtained;

[0119] The irradiated wollastonite agent, lanthanum chloride solution and silane coupling agent KH550 are mixed evenly according to a weight ratio of 4:5:1 to obtain a wollastonite active liquid;

[0120] S102: Yttrium oxide is added to the regulator according to a weight ratio of 2:5 for stirring and adjustment treatment. After the stirring is completed, filtration by suction and drying are carried out to obtain a regulated yttrium oxide body;

[0121] The regulated yttrium oxide body and the wollastonite active liquid are mixed and ball-milled according to a weight ratio of 3:5. The ball-milling speed is 1500 r / min, and the ball-milling is carried out for 2 h. After the ball-milling is completed, a modification liquid is obtained.

[0122] The stirring temperature for the stirring adjustment treatment is 60°C, the stirring speed is 400 r / min, and the stirring time is 1 h; the mass fraction of the lanthanum chloride solution is 5%.

[0123] The regulator in this embodiment comprises the following raw materials in parts by weight:

[0124] 3 parts of nano-titanium dioxide, 5 parts of a hydrochloric acid dopamine solution with a mass fraction of 5%, 1.5 parts of urea, 4 parts of flaky boron nitride, and 6 parts of a sodium lignosulfonate solution with a mass fraction of 4%.

[0125] The flaky boron nitride in this embodiment has a layer thickness of 3 nm; the sheet diameter is 3 µm.

[0126] Example 3

[0127] A preparation method of cobalt-containing high-speed steel in this embodiment comprises the following steps:

[0128] Step 1, weigh the raw materials according to parts by weight:

[0129] 57.5 parts of Fe, 3.5 parts of Mo, 3 parts of W, 0.65 parts of V, 0.35 parts of Co, 0.15 parts of C, and 0.15 parts of rare earth elements;

[0130] Step 2, subject Fe, Mo, W, V, Co, and C in Step 1 to complete melting treatment to form a melt, then add rare earth elements and continue melting for 1 - 2 h to obtain a casting liquid;

[0131] Step 3, inject the casting liquid into a metal mold preheated to 225°C for casting to obtain an ingot blank;

[0132] Step 4, immerse the ingot blank into a sufficient amount of an immersion regulator modified based on hydroxyapatite for ultrasonic immersion adjustment treatment, with an ultrasonic immersion adjustment power of 375 W and an ultrasonic time of 20 min. After the immersion adjustment is completed, filter by suction and dry to obtain an immersion-adjusted ingot blank;

[0133] Step 5, perform solution treatment on the immersion-adjusted ingot blank, and then perform aging treatment;

[0134] Step 6, coat the surface of the ingot blank treated in Step 5 with a modification liquid until the surface of the ingot blank is wetted, and then perform induction heating treatment to obtain the cobalt-containing high-speed steel of the present invention.

[0135] The rare earth elements in this embodiment are prepared by mixing neodymium, gadolinium, and scandium in a weight ratio of 2:1:1;

[0136] The temperature of the solution treatment is 520°C, and the treatment time is 1.5 hours; the temperature of the aging treatment is 365°C, and the treatment time is 15 hours;

[0137] The induction heating treatment adopts distributed induction heating treatment. The specific induction heating method is:

[0138] First, induction heating is carried out at a temperature of 795 °C for 2 h, then the temperature is decreased at a rate of 2 °C / min to 55 °C, induction heating is carried out for 1 h, and finally air cooling is carried out to room temperature.

[0139] The preparation method of the dipping agent based on hydroxyapatite modification in this example is as follows:

[0140] S01: First, hydroxyapatite is fully stirred in a sufficient amount of 5% potassium permanganate solution by mass fraction, then washed with water, filtered by suction, dried, and the dried hydroxyapatite is preheated to 60 °C for heat preservation treatment;

[0141] S02: 4 parts of the hydroxyapatite treated in S01, 1.5 parts of stearic acid, 0.025 parts of manganese powder, 0.025 parts of chromium powder and 6.5 parts of sodium alginate solution are mixed thoroughly, then filtered by suction and dried to obtain a regulator based on hydroxyapatite;

[0142] S03: Kaolin is heat-treated at 155 °C for 15 min, then air-cooled to room temperature. 4 parts of the heat-treated kaolin, 2 parts of aluminum borate whiskers, 6.5 parts of chitosan solution and 2.5 parts of sodium dodecylbenzenesulfonate are mixed thoroughly to obtain a kaolin complex-modified whisker liquid;

[0143] S04: The regulator based on hydroxyapatite and the kaolin complex-modified whisker liquid are ultrasonically treated according to a weight ratio of 2:5 to obtain a dipping agent based on hydroxyapatite modification.

[0144] The mass fraction of the sodium alginate solution is 3.5%; the mass fraction of the chitosan solution is 4%.

[0145] The ultrasonic power of the ultrasonic treatment in this example is 470 W, and the ultrasonic time is 25 min.

[0146] The preparation method of the modification liquid in this example is as follows:

[0147] S101: Wollastonite is irradiated in a proton irradiation chamber for 12.5 min with an irradiation power of 375 W. After the irradiation ends, an irradiated wollastonite agent is obtained;

[0148] The irradiated wollastonite agent, lanthanum chloride solution and silane coupling agent KH550 are mixed uniformly according to a weight ratio of 3.5:5:1 to obtain a wollastonite active liquid;

[0149] S102: Yttrium oxide is added to the regulator according to a weight ratio of 2:5 for stirring and adjustment treatment. After the stirring ends, filtration by suction and drying are carried out to obtain a regulated yttrium oxide body;

[0150] The regulated yttrium oxide body and the wollastonite active liquid are mixed evenly and ball-milled according to a weight ratio of 3:5. The ball-milling speed is 1250 r / min, and ball-milling is carried out for 2 h. After the ball-milling ends, a modification liquid is obtained.

[0151] Preferably, the stirring temperature of the stirring adjustment treatment is 57.5 °C, the stirring speed is 375 r / min, and the stirring time is 1 h; the mass fraction of the lanthanum chloride solution is 3.5%.

[0152] The regulator of this example comprises the following raw materials in parts by weight:

[0153] 2.5 parts of nano-titanium dioxide, 4 parts of 5% hydrochloric acid dopamine solution by mass, 1.25 parts of urea, 3 parts of flaky boron nitride, and 5 parts of 4% sodium lignosulfonate solution by mass.

[0154] The flaky boron nitride of this example has a layer thickness of 2.5 nm; the sheet diameter is 2 µm.

[0155] Comparative Example 1

[0156] It is different from Example 3 in that no rare earth element is added.

[0157] Comparative Example 2

[0158] It is different from Example 3 in that the dipping agent treatment based on hydroxyapatite modification is not adopted.

[0159] Comparative Example 3

[0160] It is different from Example 3 in that the hydroxyapatite-based regulator is not added in the preparation of the dipping agent based on hydroxyapatite modification.

[0161] Comparative Example 4

[0162] It is different from Example 3 in that the hydroxyapatite treated with S01 is not added to the hydroxyapatite-based regulator.

[0163] Comparative Example 5

[0164] It is different from Example 3 in that manganese powder and chromium powder are not added to the hydroxyapatite-based regulator.

[0165] Comparative Example 6

[0166] It is different from Example 3 in that the kaolin complexing whisker liquid is not added in the preparation of the dipping agent based on hydroxyapatite modification.

[0167] Comparative Example 7

[0168] It is different from Example 3 in that heat-treated kaolin is not added to the kaolin complexing whisker liquid.

[0169] Comparative Example 8

[0170] It is different from Example 3 in that aluminum borate whiskers are not added to the kaolin complexing whisker liquid.

[0171] Comparative Example 9

[0172] It is different from Example 3 in that it is not treated with the modification liquid.

[0173] Comparative Example 10

[0174] It is different from Example 3 in that the adjusted yttrium oxide is not added to the modification liquid.

[0175] Comparative Example 11

[0176] It is different from Example 3 in that the regulator is not added to the adjusted yttrium oxide.

[0177] Comparative Example 12

[0178] It is different from Example 3 in that the wollastonite active solution is not added to the adjusted yttrium oxide. The process is specifically as follows: Yttrium oxide is added to the regulator according to a weight ratio of 2:5 and stirred for adjustment treatment. After stirring ends, the adjusted yttrium oxide is obtained, and other process conditions and raw materials remain unchanged.

[0179] Under normal conditions, the products of Examples 1-3 and Comparative Examples 1-12 were tested for wear resistance, impact resistance, hardness, as well as corrosion resistance and thermal stability. The products were placed under 2% hydrochloric acid mist conditions for 12 h, then placed at 70 °C for 12 h, and then transferred to -5 °C for 12 h. The above is one cycle, and the cycle treatment was carried out 10 times. The corrosion resistance and thermal stability of the products were tested, and the test results are as follows:

[0180]

[0181] It can be obtained from Examples 1-3 and Comparative Examples 1-12 that

[0182] The products of Example 3 of the present invention can achieve coordinated improvement in wear resistance, impact resistance and hardness under normal conditions, and at the same time, the corrosion resistance and thermal stability of the products are remarkable;

[0183] When the present invention does not adopt the treatment with the dipping agent modified based on hydroxyapatite and does not adopt the treatment with the modification liquid, the performance of the products deteriorates significantly. By using the two in coordination and synergistic effect, the product performance effect is the most obvious;

[0184] In the preparation of the leaching agent modified based on hydroxyapatite, the hydroxyapatite-based regulator is not added, the hydroxyapatite treated with S01 is not added to the hydroxyapatite-based regulator, manganese powder and chromium powder are not added to the hydroxyapatite-based regulator, kaolin reconditioning whisker liquid is not added in the preparation of the leaching agent modified based on hydroxyapatite, heat-treated kaolin is not added to the kaolin reconditioning whisker liquid, and aluminum borate whiskers are not added to the kaolin reconditioning whisker liquid. The performance of the product shows a trend of varying degrees of deterioration. At the same time, without adding the kaolin reconditioning whisker liquid, the performance stability of the product deteriorates significantly. Without adding the hydroxyapatite treated with S01, the coordination effect of the product performance is poor. In addition, for the leaching agent modified based on hydroxyapatite prepared by combining the hydroxyapatite-based regulator obtained by the specific method of the present invention with the kaolin reconditioning whisker liquid, the performance effect of the product is the most significant, and using other methods instead is not as obvious as the effect of the present invention;

[0185] In the modification liquid, the adjusted yttrium oxide is not added, the regulator is not added to the adjusted yttrium oxide, and the wollastonite activation liquid is not added to the adjusted yttrium oxide. The performance of the product shows a trend of deterioration. For the modification liquid obtained by the specific method of the present invention, the performance effect of the product is the most significant. At the same time, without adding the regulator to the adjusted yttrium oxide, the performance of the product deteriorates significantly.

[0186] Since the regulator has a great influence on the product performance, further research is carried out as follows:

[0187] The regulator includes the following raw materials in parts by weight:

[0188] 2.5 parts of nano-titanium dioxide, 4 parts of 5% hydrochloric acid dopamine solution by mass fraction, 1.25 parts of urea, 3 parts of flaky boron nitride, and 5 parts of 4% sodium lignosulfonate solution by mass fraction.

[0189] In this example, the layer thickness of the flaky boron nitride is 2.5 nm; the particle diameter is 2 µm.

[0190] Experimental Example 1

[0191] The only difference from Example 3 is that nano-titanium dioxide is not added to the regulator.

[0192] Experimental Example 2

[0193] The only difference from Example 3 is that flaky boron nitride is not added to the regulator.

[0194] Experimental Example 3

[0195] The only difference from Example 3 is that urea is not added to the regulator.

[0196] Experimental Example 4

[0197] The only difference from Example 3 is that sodium lignosulfonate solution is not added to the regulator.

[0198] Experimental Example 5

[0199] The only difference from Example 3 is that no dopamine hydrochloride solution is added to the regulator.

[0200]

[0201] It can be seen from Experimental Examples 1-5 that when boron nitride flakes are not added to the regulator, the change trend of product performance is the most affected among the factors of the regulator. Secondly, when nano-titanium dioxide is not added to the regulator. At the same time, when urea is not added to the regulator, when sodium lignosulfonate solution is not added to the regulator, and when dopamine hydrochloride solution is not added to the regulator, the performance of the product shows a deteriorating trend. Only by using the raw material combination of the present invention, the performance effect of the product is the most significant. By using boron nitride flakes in combination with nano-titanium dioxide and then adjusting the specific raw material ratio of the present invention, the performance effect of the product is the most significant. Using other methods to replace it is not as obvious as the effect of the present invention.

[0202] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0203] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for preparing cobalt-containing high-tech steel, characterized in that: The following steps are involved: Step 1: weigh the raw materials according to weight: Fe 55-60 parts, Mo 2-5 parts, W 2-4 parts, V 0.5-0.8 parts, Co 0.2-0.5 parts, C 0.1-0.2 parts, rare earth elements 0.1-0.2 parts; Step 2: Smelt the Fe, Mo, W, V, Co and C in step 1 to form a melt, then add the rare earth element and continue smelting for 1-2 hours to obtain a casting liquid; Step 3, injecting the casting liquid into a metal mold preheated to 200-250° C. for casting to obtain a steel ingot; Step 4, immersing the steel ingot into a sufficient amount of a hydroxyapatite-modified immersion agent for ultrasonic immersion treatment, the ultrasonic immersion power is 350-400W, the ultrasonic time is 20min, and after the immersion is completed, the immersion is filtered and dried to obtain the immersion-treated steel ingot; Step 5, performing a solution treatment on the leached steel ingot, and then performing an aging treatment; Step 6, coating the surface of the steel ingot processed in step 5 with the modifying liquid until the surface of the steel ingot is wetted, and then performing induction heating treatment to obtain cobalt-containing high-tech steel; The preparation method of the hydroxyapatite-modified infusion agent is as follows: S01: First, stir the hydroxyapatite in a sufficient amount of 5% potassium permanganate solution, then wash, filter and dry. Preheat the dried hydroxyapatite to 60°C and keep it warm. S02: 3-5 parts of hydroxyapatite treated with S01, 1-2 parts of stearic acid, 0.02-0.03 parts of manganese powder, 0.02-0.03 parts of chromium powder and 5-8 parts of sodium alginate solution are fully mixed, and then filtered and dried to obtain a hydroxyapatite-based conditioning agent; S03: heat-treating kaolin at 150-160° C. for 10-20 min, then air-cooling to room temperature, and fully blending 3-5 parts of heat-treated kaolin, 1-3 parts of aluminum borate whiskers, 5-8 parts of chitosan solution, and 2-3 parts of sodium dodecylbenzene sulfonate to obtain a kaolin composite whisker solution; S04: ultrasonically treating a hydroxyapatite-based conditioning agent and a kaolin compound whisker solution at a weight ratio of 2:5 to obtain a hydroxyapatite-modified conditioning agent; The mass fraction of the sodium alginate solution is 2-5%; the mass fraction of the chitosan solution is 3-5%; The preparation method of the modified liquid is: S101: irradiating the wollastonite in a proton irradiation box for 10 to 15 minutes at an irradiation power of 350 to 400 W, and obtaining an irradiated wollastonite agent after the irradiation is completed; The irradiated wollastonite agent, lanthanum chloride solution and silane coupling agent KH550 are uniformly mixed in a weight ratio of (3-4):5:1 to obtain a wollastonite active liquid; S102: adding yttrium oxide to the regulator in a weight ratio of 2:5, stirring and regulating, and after stirring, filtering and drying to obtain a regulated yttrium oxide body; The adjusted yttrium oxide body and wollastonite active liquid are mixed and ball-milled in a weight ratio of 3:5, with a ball-milling speed of 1000-1500 r / min for 2 hours, and the modified liquid is obtained after the ball-milling is completed; The mass fraction of the lanthanum chloride solution is 2-5%; The regulator comprises the following raw materials in parts by weight: 2 to 3 parts of nano titanium dioxide, 3 to 5 parts of 5% dopamine hydrochloride solution by mass, 1 to 1.5 parts of urea, 2 to 4 parts of flaky boron nitride and 4 to 6 parts of 4% sodium lignin sulfonate solution by mass.

2. The method for preparing a cobalt-containing high-tech steel according to claim 1, characterized in that: The rare earth elements are neodymium, gadolinium and scandium mixed in a weight ratio of 2:1:1; The temperature of the solution treatment is 500-540°C for 1-2 hours; the temperature of the aging treatment is 350-380°C for 10-20 hours; Induction heating treatment adopts distributed induction heating treatment. The specific induction heating method is: First, induction heating was performed at 790-800°C for 2 h, then the temperature was lowered to 550-560°C at a rate of 1-3°C / min, induction heating was performed for 1 h, and finally air-cooled to room temperature.

3. The method for preparing a cobalt-containing high-tech steel according to claim 1, characterized in that: The ultrasonic power of the ultrasonic treatment is 450-500W, and the ultrasonic time is 20-30min.

4. The method for preparing a cobalt-containing high-tech steel according to claim 1, characterized in that: The stirring temperature of the stirring adjustment treatment is 55-60° C., the stirring speed is 350-400 r / min, and the stirring time is 1 hour.

5. The method for preparing a cobalt-containing high-tech steel according to claim 1, characterized in that: The flake-shaped boron nitride has a layer thickness of 2 to 3 nm and a flake diameter of 1 to 3 μm.

6. Cobalt-containing high-tech steel prepared by the method for preparing cobalt-containing high-tech steel as claimed in any one of claims 1 to 5.

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