45 results about "Austempering" patented technology

A method for manufacturing a wave gear device comprises: a hot forming step of hot forming an alloy steel composed of nickel, copper, molybdenum, and silicon into a first molded product having a silk hat-type housing shape at a first temperature of 950 to 1300°C; a normalizing step of isolating the first molded product at the first temperature for a predetermined time and, after the isolating time has elapsed, slowly cooling the first molded product to a second temperature of 750 to 900°C; an austempering step of isolating the first molded product at the second temperature and then cooling it to a third temperature of 250 to 400°C to form residual austenite in the first molded product; a heat treatment step of isolating the first molded product that has undergone the austempering step at the third temperature and then cooling it at room temperature to stabilize the microstructure of the first molded product; and a gear forming step of turning and toothing the first molded product that has undergone the heat treatment step to form a second molded product having a soluble external gear shape. The method comprises a step and a trip step of applying impact to the surface of the second molded product to induce a processing-induced transformation in some of the austenite remaining in the second molded product, thereby transforming the surface of the second molded product into martensite.

The invention provides a steel wire rod for a 2300MPa-grade steel-cored aluminum strand and a production method of the steel wire rod. The method sequentially comprises the following steps of molten iron pre-desulfurization, converter smelting, external refining, continuous casting, casting blank heating, high-speed wire rolling and online isothermal quenching and tempering, and the steel wire rod is obtained. On the basis of adjustment of chemical components of the wire rod and control over production processes such as continuous casting, rolling and online quenching-tempering treatment, the homogeneity of steel is improved, the metallographic structure of the wire rod prepared through the production method is mainly sorbite, the sorbite rate is larger than or equal to 97%, and the sorbite lamellar spacing is 45-65 nm; the tensile strength is 1620 to 1700 MPa, and the percentage reduction of area is 35 to 44 percent; the steel wire rod is drawn, galvanized and twisted into a galvanized steel strand which can be used for a steel core of a steel-cored aluminum strand.

The invention discloses a heat treatment process of an M62 material for an X-ray tube bearing. The heat treatment process comprises the following steps: S1, preparing the M62 material; s2, the M62 material is subjected to high-temperature annealing process machining, and the M62 material subjected to high-temperature annealing process machining is subjected to turning treatment to obtain a bearing turning part; s3, the bearing turning part is subjected to third-time preheating machining, and the bearing turning part subjected to third-time preheating machining is subjected to quenching heat preservation treatment; s4, on the basis of the step S3, isothermal quenching machining is conducted on the bearing turning part subjected to quenching and heat preservation treatment; and S5, based on the step S4, low-temperature tempering machining is conducted on the bearing turning part subjected to isothermal quenching machining, and high-temperature tempering machining is conducted on the bearing turning part subjected to low-temperature tempering machining twice. The method solves the problems of low cutting efficiency caused by high annealing hardness after heat treatment of the traditional M62 material, high material performance dispersity and shortened service life caused by non-uniform heating of the internal structure of the alloy, and overhigh hardness and insufficient toughness after heat treatment.

The application belongs to the technical field of laser additive manufacturing, and particularly relates to a laser additive manufacturing CrNiMo steel and a preparation method and application thereof. The application is prepared through secondary isothermal quenching treatment, specifically, under the temperature of 320 DEG C to 380 DEG C, heat preservation for 20 min to 45 min, so that the undercooled austenite occurs lower bainite phase transformation, and the first isothermal quenching treatment is completed; the sample after the first isothermal quenching treatment is preserved at 240 DEG C to 300 DEG C for 10 min to 20 min, fine lath-shaped martensite is obtained, and the second isothermal quenching is completed; and during the two isothermal quenching processes, nano-scale precipitates are dispersedly precipitated at the lath interface, significant strengthening is generated, the optimal organizational morphology of lower bainite + martensite + a small amount of dispersed carbide + residual austenite is realized, and the balance of high strength and high toughness is achieved. Compared with the prior art, the tensile strength of the CrNiMo steel prepared by the application is increased by more than 60%, and the impact toughness is increased by more than 100%.

The invention discloses a cyaniding-composite isothermal quenching synergistic strengthening and high strengthening and toughening method for 18Cr2Ni4WA steel, and relates to the technical field of heat treatment of high-strength alloy steel. The method can effectively reduce the core hardness on the premise of ensuring the surface hardness and wear resistance, and comprises the following steps: 1, quenching and tempering; 2, carbonitriding treatment is carried out; 3, composite isothermal quenching; and 4, carrying out ice-cooling treatment and low-temperature tempering treatment. According to the 18Cr2Ni4WA steel cyaniding-composite isothermal quenching synergistic strengthening and high strengthening and toughening method, the surface hardness of the strengthened and high strengthening and toughening 18Cr2Ni4WA steel prepared through the 18Cr2Ni4WA steel cyaniding-composite isothermal quenching synergistic strengthening and high strengthening and toughening method is 750 HV0.2 or above, meanwhile, the core hardness is lower than 420 HV0.2, the tensile strength is higher than 1600 MPa, the surface hardness and the core hardness are both considered, and meanwhile the mechanical property is enhanced. According to the method, the strengthened 18Cr2Ni4WA steel with high toughness can be obtained.

The invention relates to the technical field of manufacturing of metal composite materials, and discloses a corrosion-resistant and wear-resistant bimetal composite cylinder liner which is prepared through the following steps that the inner wall of an outer-layer matrix steel pipe is pretreated and coated with an interface activation flux; raw materials containing waste steel, ferrochrome and the like are molten, ferrotitanium and ferroboron are sequentially added for alloying, then ferric oxide powder and metal yttrium are added for modification treatment, and inner-layer alloy liquid is obtained; the preheated outer-layer matrix steel pipe is placed in a rotating state, and the inner-layer alloy liquid is poured; and after the to-be-solidified pipe fitting is cooled to the room temperature, the pipe fitting is heated to the austenitizing temperature, heat preservation is conducted, and then isothermal quenching treatment is conducted. According to the method, interface oxides are effectively removed and firm metallurgical bonding is promoted by utilizing the interface activation flux; a core is formed through in-situ reaction of metal yttrium and ferric oxide so as to refine grains; and a lower bainite and retained austenite mixed structure is obtained through isothermal quenching, the comprehensive mechanical property of the cylinder sleeve is improved, and the service life of the cylinder sleeve is prolonged.

The invention relates to the field of ferrous metallurgy, in particular to high-purity, high-homogeneity and fully-quenched GCr20MnMoRE rare earth bearing steel for a large cylindrical roller and a preparation method of the high-purity, high-homogeneity and fully-quenched GCr20MnMoRE rare earth bearing steel. The alloy comprises the following components in percentage by weight: 0.90 to 1.20 percent of C, 0.10 to 0.60 percent of Si, 0.60 to 1.20 percent of Mn, 1.60 to 2.20 percent of Cr, 0.40 to 1.0 percent of Mo, 0.10 to 0.50 percent of Ni, 0.005 to 0.020 percent of RE and the balance of Fe and inevitable impurities. According to the rare earth alloy steel for the large cylindrical roller, through RE + Mo co-alloying, molten steel purification and inclusion modification, liquation is avoided, and the hardenability is improved, so that network carbide, structure consistency and hardness uniformity are controlled. Moreover, the high-purity, high-homogeneity and full-through-quenching large cylindrical roller is obtained through the process technologies of purification smelting, rare earth deep deoxidation, airtight protection pouring, low-oxygen secondary remelting, high-temperature homogenization, uniform large deformation, forging rolling rapid cooling, efficient spheroidizing annealing, isothermal salt bath isothermal quenching, multiple gradient tempering and the like.

The application discloses a heat treatment method for improving the content of residual austenite of high-strength steel and improving low-temperature impact toughness, the quenching temperature is 830-870 DEG C, and the holding time is 10-30 min; the quenching furnace is set as follows: the steel plate heat transmittance of the heating section is 1.4-1.8 min / mm, the heating time is 1.4*h min, wherein h is the thickness of the steel plate, the target temperature of each section is lower than the quenching temperature by 70 DEG C, 50 DEG C, 20 DEG C and 0 DEG C; the quenching cooling process is as follows: after the austenitized steel plate is taken out from the quenching furnace, the steel plate is sent into a quenching machine to perform isothermal quenching, the quenching medium temperature is a constant temperature between 20 DEG C and 200 DEG C, the water amount ratio of each region of the quenching machine is set according to the following table parameters, the quenching machine roller speed is controlled to be 15-25 m / min, and the quenching end temperature is controlled to be 400-500 DEG C; and after quenching, the steel plate is transported to a cooling bed to be air-cooled to room temperature. The application solves the problems of high manufacturing cost and long delivery cycle of high-strength steel plates.

The application discloses a high-strength and high-toughness nodular cast iron crankshaft casting process, which comprises the following steps: step one, component optimization; step two, smelting and pretreatment; step three, spheroidizing and inoculation treatment; step four, pouring system design; step five, solidification control; step six, isothermal quenching; step seven, surface strengthening; step eight, finishing and detection; the application improves the hardenability by nickel element, forms upper bainite through isothermal quenching, combines three times of inoculation to refine graphite, and realizes the balance between strength and toughness. The stepped pouring system and the cold iron layout effectively eliminate shrinkage holes, and the process yield is increased to 75%. The ion nitriding and laser shock superposition significantly improve the surface hardness, wear resistance and fatigue strength, and meet the demand of high-load working conditions. Compared with forged steel crankshafts, the weight is reduced by 12%, the cost is saved by 35%, and the green manufacturing requirement is met.

The invention discloses 15.8 grade ultrahigh strength delayed fracture resistant steel for fasteners and a manufacturing method of the 15.8 grade ultrahigh strength delayed fracture resistant steel. The 15.8 grade ultrahigh strength delayed fracture resistant steel comprises, by mass, 0.40%-0.50% of C, 0.15%-0.35% of Si, 0.50%-1.00% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.010% of S, 0.90%-1.20% of Cr, 0.10%-0.20% of Ni, 0.70%-0.90% of Mo, 0.20%-0.40% of V, 0.02%-0.08% of Nb, 0.010%-0.020% of Ti, 0.020%-0.040% of Al, 0.0040%-0.0080% of N and the balance Fe and inevitable impurity elements. The manufacturing process comprises the steps of converter smelting, LF refining, RH vacuum degassing, continuous casting, heating and cogging, flaw detection and coping, high-speed wire rolling, follow-up treatment and the like, a lower bainite structure is obtained after a wire rod is subjected to annealing, wire drawing, cold heading and isothermal quenching heat treatment, and the mechanical properties of the lower bainite structure are as follows: the tensile strength is 1500-1670 MPa, the yield strength is larger than or equal to 1200 MPa, the ductility is larger than or equal to 9%, and the percentage reduction of area is larger than or equal to 48%; and the material has excellent delayed fracture resistance, and is suitable for high-end fields such as aerospace, rail transit and the like.

The invention belongs to the technical field of metal material heat treatment, and particularly relates to Cu-containing high-carbon bainite complex-phase steel based on isothermal quenching and a preparation technology. The invention relates to a high-temperature-resistant steel plate, which comprises the following chemical components in percentage by mass: 0.65 to 0.70 percent of C; 1.80% to 1.90% of Si; 1.00% to 1.10% of Cr; 1.05% to 1.10% of Ni; cu: 0.52 to 1.12%; 0.38% to 0.42% of Mo; wherein the balance is Fe and inevitable impurities with the total amount smaller than 0.05%. The microstructure of the Cu-containing high-carbon bainite complex-phase steel comprises a superfine bainite ferrite batten, retained austenite and a dispersed epsilon-Cu precipitated phase, and the width of the bainite ferrite batten is smaller than 200 nm. The material adopts high carbon and high silicon, and the complex-phase bainite steel is prepared by austenitizing a steel billet and then carrying out isothermal quenching heat treatment at the temperature above the martensite transformation starting temperature. The Cu-containing high-carbon bainite complex-phase steel has the advantages of high strength, high hardness, good plasticity and good toughness in the aspect of mechanical properties, the preparation process is simple, and industrial production is easy.

The invention relates to the technical field of horizontal continuous casting temperature control, in particular to a continuous casting control method for isothermal quenching ductile iron production, which comprises the following steps: acquiring the temperature of each preset position in a heating furnace in real time, and acquiring the heating power of the heating furnace and the temperature of a casting in real time; for the Smith predictor used for temperature control in the heat preservation stage in the austenitizing process and the isothermal quenching process, the time constant of a reference model in the Smith predictor is adjusted, and the temperature is controlled based on the adjusted Smith predictor; the process of adjusting the time constant comprises the following steps of: obtaining a temperature distribution factor, thermal response lag time and a power influence factor at each acquisition moment; and further obtaining a heat transfer compensation coefficient at each acquisition moment, and adjusting a time constant of a reference model in the Smith predictor. The invention aims to improve the accuracy of temperature control and avoid temperature fluctuation in the heat preservation stage.

The application relates to the field of aluminum alloy materials, and provides a manufacturing method of a high-strength thin-wall aluminum alloy extrusion casting part, and aims to solve the problems of insufficient strength and large heat treatment deformation of the existing aluminum alloy extrusion casting part. The method adopts an Al-Si-Mg-Cu-Zn series casting alloy with a specific component proportion, and through steps of an optimized extrusion casting process, solid solution treatment, precooling treatment and isothermal quenching, an organizational structure containing 1.0-3.5 vol% Al5Mg8Si6Cu2 strengthening phase is formed, the strengthening phase forms a semi-coherent interface with a matrix during precipitation, and the mechanical properties of the casting are effectively improved. The casting prepared by the application has a tensile strength of greater than or equal to 368 MPa, a yield strength of greater than or equal to 316 MPa, and a flatness deviation of 0.1-0.25 mm / 100 mm, is suitable for manufacturing thin-wall structural parts with high requirements for high strength and high dimensional accuracy, and has a wide engineering application prospect.

The application discloses a kind of multilayer gradient heat treatment processes of hydraulic shears blade, belong to metal heat treatment technical field.The present heavy blade toughness mutual repulsion and subsurface easy peeling problem, the application includes the following steps: the whole preheating blade after pretreatment is heated to 900~920 DEG C;Through time sequence interlock logic control high frequency power supply, and combine dynamic coupling algorithm accurate control high-frequency pulse time, make blade cross section form from inside to outside austenite solid solubility level difference;Subsequently, high-pressure pure nitrogen pulse precooling is used, and is put into double-groove ladder nitrate bath with air transfer to carry out isothermal quenching, realize spatial staggered peak change;Finally, cryogenic and multiple gradient tempering are carried out.The application successfully builds triple microstructure gradient of high toughness self-tempering martensite in the heart, high alloy lower bainite in transition zone and surface ultrafine martensite in the blade, completely eliminates the structure stress mutation, greatly improves the service life and fatigue peeling resistance of the blade.

The invention relates to the technical field of alloy steel processing, in particular to high-bearing-capacity high-precision surface strengthened steel and a micro-deformation heat treatment process thereof, and the high-bearing-capacity high-precision surface strengthened steel comprises carbon, chromium, silicon, manganese, nitrogen, boron, oxygen, sulfur, phosphorus, nickel, molybdenum and other metal elements. According to the method, a semi-finished product is subjected to surface severe deformation microalloying treatment, surface carbonitriding treatment, isothermal quenching (including waste heat austenitizing, water isothermal quenching and deep cooling), acid pickling and blackening treatment, and the final product is obtained. By adopting the design of reducing the carbon content component, the core part of the bearing has higher toughness, and the surface has high strength and high hardness after surface carburization, so that a part product with good core part toughness and high surface strength is finally obtained. According to the technology, the deformation of a final product is extremely low, the precision is improved, and the subsequent machining procedure can be removed. The amount of retained austenite in the surface structure of the final product is less than 3%, the surface hardness is not less than 63 HRC, and the lowest hardness of the core part is not greater than 45 HRC.

This invention discloses a multi-layer gradient heat treatment process for hydraulic scissor blades, belonging to the field of metal heat treatment technology. Addressing the problems of strong-toughness mutual repulsion and easy subsurface spalling in existing heavy-duty blades, this invention includes the following steps: preheating the pretreated blade to 900-920℃; controlling the medium and high-frequency power supply through timing interlock logic and precisely controlling the high-frequency pulse time using a dynamic coupling algorithm, creating a gradient of austenite solid solubility from the inside to the outside of the blade cross-section; subsequently, precooling with high-pressure pure nitrogen pulses and isothermal quenching in a double-groove stepped nitrate bath with air transfer to achieve spatially staggered phase transformation; finally, deep cryogenic treatment and multiple gradient tempering. This invention successfully constructs a triple microstructure gradient within the blade: high-toughness self-tempered martensite in the core, high-alloy lower bainite in the transition zone, and ultrafine martensite on the surface, completely eliminating abrupt changes in microstructure stress and significantly improving the blade's service life and resistance to fatigue spalling.

This invention belongs to the field of metal heat treatment technology and discloses a heat treatment process for end-tooth gauges. First, 9CrWMn material is quenched and heated to a high temperature of 800–880°C. The quenching and holding time is determined based on the effective wall thickness of the end-tooth gauge and the heating equipment. Then, the quenched and held 9CrWMn material is rapidly transferred to isothermal quenching oil for isothermal quenching at a temperature of 190–230°C. After isothermal quenching, the 9CrWMn material is transferred to a cold environment for cooling for more than 2 hours. After cooling, the 9CrWMn material is returned to the isothermal quenching oil for tempering. The tempering oil temperature is the same as the isothermal quenching oil temperature in step two, and the tempering time is determined based on the effective wall thickness of the end-tooth gauge. Through the above process, 9CrWMn end tooth gauges with an effective wall thickness ≤40mm can be thoroughly quenched, with both the surface and core hardness ≥HRC62. At the same time, the parts do not crack during quenching. This invention can make the hardness of 9CrWMn after quenching reach up to HRC65~67, which can significantly improve the wear resistance and dimensional stability of the parts.

The invention discloses a heat treatment method for reducing decarburized layers and improving hardness of a 30CrMnSiNi2A alloy steel material, and the heat treatment method comprises the following steps: S1, placing a to-be-treated alloy steel material in a controllable atmosphere furnace, and carrying out purging treatment by adopting inert gas; s2, the controllable atmosphere furnace is started, isothermal quenching treatment is conducted on the alloy steel material, and inert gas is introduced in the heating stage and the heat preservation stage of isothermal quenching treatment correspondingly; s3, the quenched alloy steel material obtained after isothermal quenching treatment is transferred into a nitrate tank to be subjected to decarburization treatment; and S4, the decarburized alloy steel material obtained after decarburization treatment is placed in a tempering furnace to be subjected to tempering treatment. Compared with a traditional isothermal quenching process method, the heat treatment method disclosed by the invention not only reduces the thickness of an incompletely decarburized layer, but also remarkably improves the hardness value of the surface layer of the material and greatly improves the use performance of the 30CrMnSiNi2A alloy steel material under the condition of conforming to HB6735, so that the mechanical property requirement is met.

The present application relates to wear-resistant steel, more particularly to a high-hard-tough quenched-carbon partition wear-resistant steel and a preparation method thereof. The present application is aimed at the low hardness-toughness matching and high production cost of the existing metal material under the medium stress impact abrasive wear working condition, and the low alloy steel mainly composed of martensite and supplemented with a certain amount of metastable residual austenite is obtained by optimizing the alloy composition and adopting the process of isothermal quenching at the martensite transformation temperature (Ms), and the low alloy steel is simple and easy to control, such as smelting, casting forming, normalizing, isothermal quenching and tempering, and is low in cost and beneficial to popularization. The low alloy steel has good toughness matching while maintaining high hardness, and is suitable for the preparation of wear-resistant parts under the medium stress impact abrasive wear working condition.

This invention relates to the field of heat treatment technology for metallic materials, and discloses an isothermal quenching process for preparing a corrosion-resistant and oxidation-resistant infiltration layer for pipelines. The method involves first pre-treating the metal workpiece by degreasing and derusting to obtain a clean surface, then sequentially coating it with an inner layer of rare-earth modified aluminoborosilicate glass, a middle layer of core-shell structured composite powder and nano-reinforcing phase, and an outer layer of aluminum powder and glass frit, forming a gradient composite coating. After pre-sintering and controlled-temperature austenitization, the workpiece is rapidly transferred to a nitrate bath for isothermal quenching. Finally, residual coatings are removed by sandblasting or mechanical grinding, resulting in a workpiece with a dense, oxidation-resistant infiltration layer. This invention forms an oxidation-resistant composite coating on the workpiece surface through a three-layer gradient synergy; combined with pre-sintering to reduce thermal stress and a controlled-temperature process, it effectively inhibits oxidation and decarburization while achieving uniform bainitic transformation, improving the surface hardness, salt water corrosion resistance, and infiltration layer density of the workpiece. It is suitable for efficient oxidation protection during isothermal quenching of metallic workpieces.

The utility model provides a kind of isothermal quenching equipment for steel belt processing, it is related to steel belt processing technical field, the utility model includes equipment board, four traction rollers are rotatably connected on the equipment board by bearing, four first motors are fixedly connected on the equipment board, the traction roller is rotated by first motor drive, heating chamber is fixedly connected on the equipment board, heating tube is fixedly connected in the heating chamber, heat preservation chamber is fixedly connected on the equipment board, heat preservation plate is fixedly connected in the heat preservation chamber, cooling chamber is fixedly connected on the equipment board, annular cooling pipe is fixedly connected in the cooling chamber, the utility model solves the problem that the surface of steel belt exists impurity, in heating stage, impurity will hinder the uniform transmission of heat, and affect the uniformity of austenitizing, uneven austenitizing will make steel belt form uneven structure after quenching, cause mechanical property unstable, and cause local high hardness, local low hardness problem.

The present application relates to the field of overhead transmission line connecting hardware manufacturing, and particularly relates to a self-lubricating connecting hardware material and a preparation method thereof, which comprises the following steps: preparing scrap steel, bread iron or blast furnace molten iron, inoculation-spheroidizing agent, aluminum block and ferrosilicon according to component composition; melting the prepared scrap steel, bread iron or blast furnace molten iron into molten iron, and then adding the aluminum block and ferrosilicon to continue melting to obtain final molten iron; according to horizontal continuous casting process, pouring the final molten iron into a crystallizer of a horizontal continuous casting device after spheroidizing and inoculation treatment by wire feeding method, and continuously casting a profile for connecting hardware; and performing isothermal quenching treatment on the obtained profile for connecting hardware, so that the self-lubricating connecting hardware material is obtained after the isothermal quenching treatment. The present application solves the problem that the poor wear resistance of the galvanized layer of the current connecting hardware leads to the short service life of the hardware due to wear failure, and finally achieves the purpose of prolonging the service life of the connecting hardware in the overhead transmission line.

The application provides a heat treatment method of Bainite / Martensite dual-phase heavy steel rail with fatigue life and toughness, and belongs to the technical field of rail heat treatment.The application can complete the heat treatment by heating the sample to austenitize, and then sequentially performing isothermal quenching, tempering and air cooling on the sample.The process can obtain a Bainite / Martensite dual-phase structure mainly composed of lath-shaped bainite ferrite, accompanied by certain martensite and residual austenite, and through the synergistic regulation of isothermal quenching temperature and tempering system, the optimization of structure scale, phase ratio and residual austenite stability is realized, so that the matching of better strength, impact toughness and fatigue performance is obtained.

This invention belongs to the field of isothermal quenching technology, specifically referring to an isothermal salt bath for the production of isothermal quenched ductile iron materials. It includes a rope-controlled motion assembly, an automatic clamping assembly, an automatic valve assembly, a transfer basket assembly, a protective gas injection assembly, a pulley frame, and a sliding transfer assembly. The rope-controlled motion assembly is symmetrically arranged at both ends of the pulley frame, and the automatic clamping assembly is located within the rope-controlled motion assembly. This invention automatically clamps and releases the wire rope by the relative approach and distance between the sliding clamp and the fixed clamp, thereby achieving lateral movement and lifting / lowering drive of the transfer basket assembly through a single wire rope. Furthermore, the movement of the metal backplate drives the valve plate to slide, thereby achieving the technical objective of releasing protective gas during the transfer process and stopping the release of protective gas at the end.

The application relates to the technical field of isothermal quenching, and proposes an austempering method for prolonging the service life of ADI castings, which comprises the following steps: collecting the thickness and surface area of a casting to be isothermally quenched, preheating the casting, performing first heat preservation treatment, heating the casting to austenitizing temperature, performing second heat preservation treatment, collecting heat flow and the temperature of the casting during isothermal quenching of the casting, marking a target collection time and a prediction basis time, determining a quenching heat release influence coefficient of the target collection time and a prediction weight, combining the temperature of the casting to obtain a casting temperature prediction value of a next adjacent collection time of the target collection time, performing temperature compensation on the isothermal quenching of the casting according to the casting temperature prediction value, performing air cooling operation and cleaning on the casting after the isothermal quenching is completed, and completing the isothermal quenching of the austempered ductile iron. The application can guarantee the smooth progress of the temperature compensation process of the isothermal quenching.

The invention relates to the technical field of isothermal quenching cooling, and discloses a nodular cast iron isothermal quenching cooling method and an isothermal quenching cooling device thereof.The isothermal quenching cooling device comprises a combustion chamber, a common connecting pipe is fixedly connected to one side of the combustion chamber, an absorption bin is fixedly installed at one end of the common connecting pipe, and third air cylinders are hung on the two sides of the bottom of the absorption bin; a lifting cylinder is fixedly connected to the common bottom of the two third air cylinders, a pair of hydraulic oil cylinders is fixedly installed on each of the two sides of the middle in the combustion chamber, a discharging plate is connected to the tops of the hydraulic oil cylinders, a plurality of conveying rollers are rotationally connected to the conveying box and connected together in series through a belt, and a second motor is connected to one end of one conveying roller. According to the spheroidal graphite cast iron isothermal quenching cooling device, workpieces are uniformly cooled, meanwhile, the lifting barrel is driven by the third air cylinder to descend, the water stop plate is matched to control the liquid level of bath salt, and it is ensured that the workpieces are completely immersed. And hot air generated in the cooling process is recycled to the combustion chamber through the output pipe, waste heat recycling is achieved, and energy consumption is reduced.

The application relates to the technical field of isothermal quenching, and discloses an isothermal quenching nodular cast iron salt bath device and a use method thereof, which comprises a salt bath pool and a plurality of stirring mechanisms, a steel rotating shaft is installed on the inner wall of the bottom of the salt bath pool, symmetrical steel supports are installed on the steel rotating shaft, an arc-shaped shell is further fixedly installed on the steel support, long spiral blades are arranged in the arc-shaped shell, a collecting part is further arranged on the steel support, and the collecting part and the arc-shaped shell are connected through a transfer channel. The isothermal quenching nodular cast iron salt bath device is used for enabling the steel support to drive the long spiral blades to perform circumferential motion in the salt bath pool and rotation in the arc-shaped shell at the same time, so that the slag near the long spiral blades is captured, the slag is thrown into the arc-shaped shell under the action of the rotation of the long spiral blades, and the slag is settled in the detachable frame through the transfer channel, so that the slag in the salt bath pool can be effectively collected.

The invention relates to a casting method of an isothermal quenching ductile iron wind power planetary support, the isothermal quenching ductile iron is selected to manufacture the wind power planetary support, the isothermal quenching ductile iron is based on nodular cast iron, and the nodular cast iron comprises the following components in percentage by weight: 3.50-3.70% of C, 2.50-2.70% of Si and 1t of Mn; 0.30%, P: lt; 0.03%, S: lt; the alloy comprises the following components in percentage by weight: 0.02% of Mn, 0.035-0.055% of Mg, 0.01-0.02% of Re, 0.60-0.80% of Cu, 0.30-0.40% of Mo and less than 0.5% of Mn + Mo, so that the service life of the alloy is greatly prolonged. And meanwhile, the purposes of saving energy, reducing weight and saving materials (generally, the weight can be reduced by 1 / 4-1 / 3) can be achieved.

The invention discloses a manufacturing method of high-strength and high-wear-resistance nodular cast iron, and belongs to the technical field of metal material processing. The method comprises the following steps: (1) smelting a nodular cast iron raw material to obtain molten metal liquid; (2) a pre-nucleating agent is added into the molten metal liquid, after a reaction, a nodulizing agent is added into the molten metal liquid, and a mixed reaction is conducted; (3) a nucleating agent is added into the molten metal liquid for a reaction; (4) the molten metal liquid obtained after the reaction is completed is subjected to casting molding, and a molded part is subjected to homogenization treatment; (5) carrying out isothermal quenching treatment on the homogenized molded part; (6) performing gas carburizing treatment on the formed part subjected to isothermal quenching treatment; and (7) sequentially carrying out surface induction quenching and tempering on the molded part subjected to gas carburizing treatment. The spheroidal graphite cast iron is prepared by combining pre-inoculation treatment with gas carburization, induction quenching and other treatment processes, the excellent comprehensive performance is achieved, and the applicability of the spheroidal graphite cast iron is effectively expanded.

The invention belongs to the technical field of alloy materials, and particularly relates to ultrahigh-strength high-toughness martensite / bainite multiphase aging steel and a preparation method thereof. The method comprises the following specific steps: quenching an austenitized sample below an Ms point (martensite transformation starting temperature), carrying out isothermal quenching treatment to obtain a structure of primary martensite + bainite + retained austenite, carrying out oil quenching to room temperature after isothermal quenching, then carrying out subzero treatment to convert part of the retained austenite into martensite, and then returning to the room temperature. And the cryogenic sample is subjected to aging treatment, so that alloy carbides are separated out from the martensite and bainite complex-phase matrix, and then air cooling is conducted to the room temperature. According to the method, bainite is successfully introduced into the high-Co-Ni secondary hardening steel through low-temperature transformation by utilizing the acceleration effect of primary martensite on bainite transformation to obtain a martensite / bainite complex-phase structure, the toughness of the material is improved, and a new thought is provided for obdurability matching of the high-Co-Ni secondary hardening steel.