Aging strengthening type Cu-Cr-Re-Mg alloy and preparation device and method thereof

Abstract

The invention provides an aging strengthening type Cu-Cr-Re-Mg alloy and a preparation device and method thereof, and relates to the technical field of high-performance alloys, and the aging strengthening type Cu-Cr-Re-Mg alloy provided by the invention comprises the following element components in percentage by mass: 6-13.5% of Cr, 0.11-0.95% of Re, 0.04-0.45% of Mg and inevitable impurity content tilt. 0.2%, and the balance being Cu. According to the aging strengthening type Cu-Cr-Re-Mg alloy, the trace element Re is introduced into the aging strengthening type Cu-Cr-Re-Mg alloy, a dispersed high-temperature-resistant phase is generated after aging treatment, and the high-temperature-resistant phase and a Cr phase cooperate to strengthen a copper matrix; and meanwhile, an intermetallic compound can be generated by the added Mg element and Cr, and the effect of multiphase precipitation strengthening of a copper matrix is achieved after aging treatment, so that the hardness of the alloy is greatly improved under the condition that the electric conductivity loss is not large.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-performance alloys, and particularly relates to an aging strengthening type Cu-Cr-Re-Mg alloy and a preparation device and method thereof. BACKGROUND

[0002] The Cu-Cr series alloy is an aging strengthening type alloy, and excellent comprehensive performance can be obtained by combining cold working and deformation heat treatment of precipitation strengthening. Chinese patent 202011022673.9 discloses an aging strengthening type Cu-Cr-Zr alloy plate / band, which has high strength, high plasticity and high electrical conductivity, a tensile strength of 580 MPa, and a yield strength of 561 MPa. However, the strength of the Cu-Cr-Zr alloy plate / band provided by the above technical solution is still low.

[0003] Therefore, the present application aims to provide an aging strengthening type Cu-Cr-Re-Mg alloy and a preparation device and method thereof. The aging strengthening type Cu-Cr-Re-Mg alloy provided by the present application has high strength, a tensile strength of 660-860 MPa, and a yield strength of 625-915 MPa. SUMMARY

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] The present application provides an aging strengthening type Cu-Cr-Re-Mg alloy, which comprises the following mass percentage of element components: Cr 6-13.5%, Re 0.11-0.95%, Mg 0.04-0.45%, the sum of unavoidable impurities <0.2%, and the rest is Cu.

[0006] Preferably, the tensile strength of the Cu-Cr-Re-Mg alloy is 660-860 MPa, the yield strength is 625-915 MPa, the elongation is 10-20%, the Vickers hardness is 100-200 Hv, and the electrical conductivity is 75-92% IACS.

[0007] Preferably, the optimal tensile strength of the Cu-Cr-Re-Mg alloy is 720 MPa, the yield strength is 705 MPa, the elongation is 18%, the Vickers hardness is 168 Hv, and the electrical conductivity is 83.5% IACS.

[0008] The present application provides a preparation device of an aging strengthening type Cu-Cr-Re-Mg alloy, which comprises:

[0009] A multi-station vacuum melting and casting unit, comprising a rotary crucible group, a melting furnace and a mechanical arm, the rotary crucible group is respectively preloaded with Cr-Re intermediate alloy, Cr particles, Mg particles and Cu blocks, the mechanical arm comprises a weighing type vacuum manipulator and a water-cooled six-axis mechanical arm, the weighing type vacuum manipulator is used for putting the alloy raw materials after being weighed into the melting furnace with the crucible, and the water-cooled six-axis mechanical arm is used for transferring the cooled ingot from the melting area to the heat treatment area;

[0010] An intelligent heat treatment system, comprising a step-by-step heat treatment furnace and a dynamic temperature control module, the step-by-step heat treatment furnace comprises a homogenization treatment bin and a double aging treatment bin, and the homogenization treatment bin and the double aging treatment bin are both equipped with a nitrogen protection system;

[0011] A rolling-quenching integrated unit, comprising a hot rolling-quenching linkage line and a cold rolling-aging linkage line, the hot rolling-quenching linkage line comprises a three-roll reversible rolling mill group, an online spray quenching system matched with the three-roll reversible rolling mill group for quenching treatment of the alloy, and an integrated rear laser detector for detecting the thickness of the alloy in the quenching process, and the cold rolling-aging linkage line comprises a four-roll precision cold rolling mill group for cold rolling treatment of the alloy after hot rolling treatment;

[0012] A surface treatment unit, comprising a double-sided milling station, the double-sided milling station comprises a numerical control machine tool configured with a diamond cutter, an automatic dust removal and recovery system for collecting metal waste generated in the milling process, and a surface roughness online detector for detecting the alloy.

[0013] The application provides a preparation method of an aging strengthened Cu-Cr-Re-Mg alloy.

[0014] Step one: the rotary crucible group and the Cr-Re intermediate alloy, Cr particles, Mg particles and Cu blocks filled therein are quantitatively weighed and grabbed together by a weighing type vacuum manipulator and then put into a melting furnace for melting and cooling to obtain an alloy ingot; the alloy ingot is transferred to a homogenization treatment bin by a water-cooled six-axis mechanical arm for homogenization heat treatment to obtain a heat-treated ingot;

[0015] Step two: the heat-treated ingot is subjected to hot rolling and online quenching by an online spray quenching system matched with a three-roll reversible rolling mill group to obtain a hot-rolled alloy;

[0016] Step three: the hot-rolled alloy is subjected to face milling treatment by a numerical control machine tool with a diamond cutter to obtain a milled alloy;

[0017] Step four: the milled alloy is subjected to first cold rolling treatment by a four-roll precision cold rolling mill group to obtain a first cold-rolled alloy.

[0018] Step five: the first aging alloy is obtained by aging the first cold-rolled alloy at a first aging temperature through a double aging treatment bin;

[0019] Step six: the second cold-rolled alloy is obtained by second cold-rolling the first aging alloy through a four-roll precision cold-rolling unit;

[0020] Step seven: the aging strengthening Cu-Cr-Re-Mg alloy is obtained by aging the second cold-rolled alloy at a second aging temperature through a double aging treatment bin.

[0021] Preferably, the temperature of the homogenization heat treatment in step one is 920-1080℃, and the time is 2-8h.

[0022] Preferably, the open rolling temperature of the hot rolling in step two is 900-1050℃, and the final rolling temperature is 800-900℃; the temperature of the online quenching is 800-900℃.

[0023] Preferably, the thickness of the first cold-rolled alloy in step four is 0.2-2mm, and the thickness of the second cold-rolled alloy is 0.1-1.5mm.

[0024] Preferably, the temperature of the first aging treatment in step five is 380-480℃, and the holding time is 1-10h.

[0025] Preferably, the temperature of the second aging treatment in step seven is 350-460℃, and the holding time is 1-6h.

[0026] The present application has the following beneficial effects:

[0027] The aging strengthening Cu-Cr-Re-Mg alloy provided by the present application introduces trace element Re, which generates dispersed high-temperature-resistant phase after aging treatment, and cooperates with Cr to strengthen the copper matrix; at the same time, the addition of Mg element can generate an intermetallic compound with Cr, which plays a role in multi-phase precipitation strengthening of the copper matrix after aging treatment, thereby greatly improving the hardness of the alloy without much loss of electrical conductivity. As shown in the examples of the present application, the Cu-Cr-Re-Mg alloy provided by the present application has a tensile strength of 660-860MPa, a yield strength of 625-915MPa, and high strength.

[0028] The present application also provides a preparation device for the aging strengthening Cu-Cr-Re-Mg alloy described in the above technical solution, which integrates the seven preparation steps into a continuous production line, which can improve the production efficiency by more than 40% compared with traditional segmented equipment, while ensuring that the alloy performance meets the production indicators (tensile strength 720MPa, electrical conductivity 83.5%IACS, etc.).

[0029] The application also provides a preparation method of the age-strengthened Cu-Cr-Re-Mg alloy. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 Figure 1 is a schematic diagram of a preparation device of the age-strengthened Cu-Cr-Re-Mg alloy.

[0031] Figure 2 Figure 2 is a schematic diagram of a preparation method flow of the age-strengthened Cu-Cr-Re-Mg alloy. DETAILED DESCRIPTION

[0032] The application provides an age-strengthened Cu-Cr-Re-Mg alloy, which comprises the following mass percentage of element components: Cr 6-13.5%, Re 0.11-0.95%, Mg 0.04-0.45%, unavoidable impurities <0.2% in total, and the rest is Cu.

[0033] In the application, all the raw material components are commercially available goods known by those skilled in the art, unless otherwise specified.

[0034] The age-strengthened Cu-Cr-Re-Mg alloy provided by the application preferably comprises the following mass percentage of element components: Cr 8-12%, more preferably 9-11%; Re 0.25-0.85%, more preferably 0.4-0.6%; Mg 0.08-0.4%, more preferably 0.18-0.27%; unavoidable impurities <0.15%, more preferably <0.1%; and the rest is Cu. The application introduces trace element Re, which generates a dispersed high-temperature-resistant phase after aging treatment, and cooperates with Cr to strengthen the copper matrix; meanwhile, the addition of Mg element can generate an intermetallic compound with Cr, which plays a role in multi-phase precipitation strengthening of the copper matrix after aging treatment, so that the hardness of the alloy is greatly improved without a large loss of electrical conductivity.

[0035] In this invention, the tensile strength of the Cu-Cr-Re-Mg alloy is preferably 660~860MPa, more preferably 700~800MPa, and most preferably 720MPa; the yield strength of the Cu-Cr-Re-Mg alloy is preferably 625~915MPa, more preferably 680~820MPa, and most preferably 705MPa; the elongation of the Cu-Cr-Re-Mg alloy is preferably 10~20%, more preferably 12~19%, and most preferably 18%; the Vickers hardness of the Cu-Cr-Re-Mg alloy is preferably 100~200Hv, more preferably 120~180Hv, and most preferably 168Hv; the electrical conductivity of the Cu-Cr-Re-Mg alloy is preferably 80~90%IACS, more preferably 82~88%IACS, and most preferably 83.5%IACS.

[0036] like Figure 1 As shown, the present invention also provides an apparatus for preparing the age-hardening Cu-Cr-Re-Mg alloy described in the above technical solution, including a multi-station vacuum casting unit, an intelligent heat treatment system, a rolling-quenching integrated unit, and a surface treatment unit.

[0037] In this invention, the multi-station vacuum casting unit includes a rotary crucible group, a melting furnace, and a robotic arm. The rotary crucible group is pre-loaded with Cr-Re master alloy, Cr granules, Mg granules, and Cu blocks. The robotic arm includes a weighing vacuum robotic arm and a water-cooled six-axis robotic arm. The weighing vacuum robotic arm is used to place the alloy raw material, after being borne by the load, into the melting furnace along with the crucible and cool it after melting. The water-cooled six-axis robotic arm is used to transfer the cooled ingot from the melting zone to the heat treatment zone.

[0038] The weighing vacuum manipulator can automatically feed the alloy raw materials, which have been loaded with weight, into the melting furnace along with the crucible. The melting furnace adopts a three-stage heating system (1050℃ / 1350℃ / cooling zone) and is equipped with an infrared thermometer and an electromagnetic stirrer.

[0039] In this invention, the intelligent heat treatment system includes a walking beam heat treatment furnace and a dynamic temperature control module. The walking beam heat treatment furnace includes a homogenization treatment chamber and a dual aging treatment chamber, both of which are equipped with a nitrogen protection system.

[0040] The homogenization chamber has an adjustable processing temperature of 920-1080℃, while the dual aging chamber uses independent temperature control with a processing temperature of 350-480℃. The dynamic temperature control module uses PID control + AI algorithm to achieve ±1℃ accuracy control.

[0041] In this invention, the rolling-quenching integrated unit includes a hot rolling quenching line and a cold rolling aging line. The hot rolling quenching line includes a three-roll reversible rolling mill, an online spray quenching system that works in conjunction with the three-roll reversible rolling mill to quench the alloy, and an integrated laser detector for detecting the alloy thickness during quenching. The cold rolling aging line includes a four-roll precision cold rolling mill that performs cold rolling on the hot-rolled alloy.

[0042] The three-roll reversible rolling mill has an adjustable starting temperature of 900-1050℃, the online spray quenching system has a temperature control range of 800-900℃, and the four-roll precision cold rolling mill has an adjustable cold rolling thickness of 0.1-2mm for alloys.

[0043] In this invention, the surface treatment unit includes a double-sided milling workstation, which includes a CNC machine tool equipped with diamond tools, an automatic dust collection and recycling system for collecting metal chips generated during milling, and an online surface roughness detector for detecting alloys.

[0044] like Figure 2 As shown, the present invention also provides a method for preparing the age-hardening Cu-Cr-Re-Mg alloy described in the above technical solution, comprising the following steps:

[0045] Step 1: Using a weighing vacuum manipulator, a rotary crucible assembly and the Cr-Re master alloy, Cr granules, Mg granules, and Cu blocks inside are quantitatively and weighted together and placed into a melting furnace for melting and cooling to obtain an alloy ingot; the alloy ingot is then transferred to a homogenization treatment chamber by a water-cooled six-axis mechanical transfer for homogenization heat treatment to obtain a heat-treated ingot.

[0046] Step 2: The heat-treated ingot is hot-rolled and then quenched online using an online spray quenching system in conjunction with a three-roll reversible rolling mill to obtain a hot-rolled alloy;

[0047] Step 3: The hot-rolled alloy is milled using a CNC machine tool with diamond tools to obtain a milled alloy.

[0048] Step 4: The milled alloy is subjected to a first cold rolling process using a four-roll precision cold rolling mill to obtain a first cold-rolled alloy;

[0049] Step 5: The first cold-rolled alloy is subjected to a first aging treatment at a first aging temperature through a dual aging chamber to obtain a first aged alloy;

[0050] Step 6: The first aging alloy is subjected to a second cold rolling process using a four-roll precision cold rolling mill to obtain a second cold-rolled alloy;

[0051] Step 7: The second cold-rolled alloy is subjected to a second aging treatment at a second aging temperature through a dual aging chamber to obtain an age-strengthened Cu-Cr-Re-Mg alloy.

[0052] In this invention, the temperature of the homogenization heat treatment is preferably 920~1080℃, more preferably 950~1060℃; the time of the homogenization heat treatment is preferably 2~8h, more preferably 3~7h.

[0053] In this invention, the initial rolling temperature of the hot rolling is preferably 900~1050℃, more preferably 970~1000℃; the final rolling temperature of the hot rolling is preferably 800~900℃, more preferably 820~880℃; and the online quenching temperature is preferably 800~900℃, more preferably 820~880℃.

[0054] In this invention, the thickness of the first cold-rolled alloy is preferably 0.2~2mm, more preferably 0.3~0.6mm. The thickness of the second cold-rolled alloy is preferably 0.1~1.5mm, more preferably 0.15~0.5mm.

[0055] In this invention, the temperature of the first aging treatment is preferably 380~480℃, more preferably 400~460℃; the holding time of the first aging treatment is preferably 1~10h, more preferably 3~8h; the temperature of the second aging treatment is preferably 350~460℃, more preferably 380~430℃; the holding time of the second aging treatment is preferably 1~6h, more preferably 3~5h.

[0056] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0057] Example 1

[0058] Combination Figure 1 and Figure 2 The specific steps of the preparation method of the age-hardening Cu-Cr-Re-Mg alloy provided in this embodiment are as follows:

[0059] The Cr-Re master alloy, Cr granules, Mg granules, and Cu blocks were placed in their respective crucibles and placed in a melting furnace. A small amount of argon gas was introduced, and melting began. The crucibles were heated to 1050°C and held for 3 minutes; then the temperature was increased to 1350°C and held for 30 minutes; finally, the furnace was cooled to obtain the alloy ingot. The obtained alloy ingot was subjected to homogenization heat treatment in a walking beam furnace at 1020℃ for 4 hours to obtain a heat-treated ingot. The heat-treated ingot was then hot-rolled at an initial rolling temperature of 970℃ and a final rolling and online quenching temperature of 850℃. The hot-rolled alloy after hot rolling and quenching was then milled. After milling, a first cold rolling was performed to obtain a first cold-rolled alloy with a thickness of 0.4mm. The first cold-rolled alloy was then subjected to a first aging treatment at 450℃ for 7 hours. After the first aging treatment, a second cold rolling was performed to obtain a second cold-rolled alloy with a thickness of 0.15mm. Finally, the second cold-rolled alloy was subjected to a second aging treatment at 420℃ for 3 hours to obtain an age-strengthened Cu-Cr-Re-Mg alloy.

[0060] The age-hardening Cu-Cr-Re-Mg alloy prepared in this embodiment comprises the following elemental composition by mass percentage: Cr 10%, Re 0.6%, Mg 0.27%, Cu 88.28%, and unavoidable impurities 0.85%.

[0061] The properties of the age-hardened Cu-Cr-Re-Mg alloy obtained in this embodiment were tested, and the test results are as follows: tensile strength 720MPa, yield strength 705MPa, elongation 18%, Vickers hardness 168Hv, and electrical conductivity 83.5%IACS.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An age-hardening Cu-Cr-Re-Mg alloy, characterized in that, The elemental composition includes the following mass percentages: Cr 6~13.5%, Re 0.11~0.95%, Mg 0.04~0.45%, unavoidable impurities total <0.2%, and the remainder is Cu.

2. The age-hardening Cu-Cr-Re-Mg alloy according to claim 1, characterized in that, The Cu-Cr-Re-Mg alloy has a tensile strength of 660~860MPa, a yield strength of 625~915MPa, an elongation of 10~20%, a Vickers hardness of 100~200Hv, and an electrical conductivity of 75~92%IACS.

3. The age-hardening Cu-Cr-Re-Mg alloy according to claim 2, characterized in that, The most preferred tensile strength of the Cu-Cr-Re-Mg alloy is 720 MPa, yield strength is 705 MPa, elongation is 18%, Vickers hardness is 168 Hv, and electrical conductivity is 83.5% IACS.

4. An apparatus for preparing an age-hardening Cu-Cr-Re-Mg alloy, characterized in that, include: A multi-station vacuum casting unit includes a rotary crucible group, a melting furnace, and a robotic arm. The rotary crucible group is pre-loaded with Cr-Re master alloy, Cr granules, Mg granules, and Cu blocks. The robotic arm includes a weighing vacuum robotic arm and a water-cooled six-axis robotic arm. The weighing vacuum robotic arm is used to place the alloy raw material, after being loaded with weight, into the melting furnace along with the crucible and cool it after melting. The water-cooled six-axis robotic arm is used to transfer the cooled ingot from the melting zone to the heat treatment zone. The intelligent heat treatment system includes a walking beam heat treatment furnace and a dynamic temperature control module. The walking beam heat treatment furnace includes a homogenization treatment chamber and a dual aging treatment chamber. Both the homogenization treatment chamber and the dual aging treatment chamber are equipped with a nitrogen protection system. The rolling-quenching integrated unit includes a hot rolling quenching line and a cold rolling aging line. The hot rolling quenching line includes a three-roll reversible rolling mill, an online spray quenching system that works in conjunction with the three-roll reversible rolling mill to quench the alloy, and an integrated laser detector to detect the alloy thickness during the quenching process. The cold rolling aging line includes a four-roll precision cold rolling mill that performs cold rolling on the hot-rolled alloy. The surface treatment unit includes a double-sided milling workstation, which includes a CNC machine tool equipped with diamond tools, an automatic dust collection and recycling system for collecting metal chips generated during milling, and an online surface roughness detector for testing the alloy.

5. A method for preparing an age-hardening Cu-Cr-Re-Mg alloy, comprising the apparatus for preparing an age-hardening Cu-Cr-Re-Mg alloy according to claim 4, characterized in that, Includes the following steps: Step 1: Using a weighing vacuum manipulator, a rotary crucible assembly and the Cr-Re master alloy, Cr granules, Mg granules, and Cu blocks inside are quantitatively and weighted together and placed into a melting furnace for melting and cooling to obtain an alloy ingot; the alloy ingot is then transferred to a homogenization treatment chamber by a water-cooled six-axis mechanical transfer for homogenization heat treatment to obtain a heat-treated ingot. Step 2: The heat-treated ingot is hot-rolled and then quenched online using an online spray quenching system in conjunction with a three-roll reversible rolling mill to obtain a hot-rolled alloy; Step 3: The hot-rolled alloy is milled using a CNC machine tool with diamond tools to obtain a milled alloy. Step 4: The milled alloy is subjected to a first cold rolling process using a four-roll precision cold rolling mill to obtain a first cold-rolled alloy; Step 5: The first cold-rolled alloy is subjected to a first aging treatment at a first aging temperature through a dual aging chamber to obtain a first aged alloy; Step 6: The first aging alloy is subjected to a second cold rolling process using a four-roll precision cold rolling mill to obtain a second cold-rolled alloy; Step 7: The second cold-rolled alloy is subjected to a second aging treatment at a second aging temperature through a dual aging chamber to obtain an age-strengthened Cu-Cr-Re-Mg alloy.

6. The method for preparing an age-hardening Cu-Cr-Re-Mg alloy according to claim 5, characterized in that, The homogenization heat treatment in step one is performed at a temperature of 920~1080℃ for 2~8 hours.

7. The method for preparing an age-hardening Cu-Cr-Re-Mg alloy according to claim 5, characterized in that, In step two, the initial rolling temperature of hot rolling is 900~1050℃, and the final rolling temperature is 800~900℃; the online quenching temperature is 800~900℃.

8. The method for preparing an age-hardening Cu-Cr-Re-Mg alloy according to claim 5, characterized in that, In step four, the thickness of the first cold-rolled alloy is 0.2~2mm, and the thickness of the second cold-rolled alloy is 0.1~1.5mm.

9. The method for preparing an age-hardening Cu-Cr-Re-Mg alloy according to claim 5, characterized in that, The temperature of the first aging treatment in step five is 380~480℃, and the holding time is 1~10h.

10. The method for preparing an age-hardening Cu-Cr-Re-Mg alloy according to claim 5, characterized in that, The temperature for the second aging treatment in step seven is 350~460℃, and the holding time is 1~6h.

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