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Heat treatment method capable of improving performance stability of medium/high-tonnage smelted CuNiSiCr alloy

A heat treatment method and technology for stability, applied in the field of heat treatment that can improve the performance stability of CuNiSiCr alloys smelted in medium and high tonnage, can solve the problems of deterioration of mechanical properties such as strength, high output capacity requirements, and small post-processing space, so as to maintain high strength High conductivity, strong operability, reducing the effect of precipitation and coarsening

Active Publication Date: 2017-09-01
深圳市卡德姆科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the preparation of medium and high tonnage CuNiSiCr alloys, especially when the monomer mass exceeds 1t, traditional melting and casting has become a more feasible method, but it faces serious problems of composition and structure uniformity. Existing common problems, this inhomogeneity makes the local area of ​​large parts become a weak point, and it is easier to fail first and then expand to the whole under the action of external conditions, causing huge losses
[0005] Generally speaking, homogenizing annealing at high temperature for a long time on castings is beneficial to alleviate and solve the inhomogeneity in the composition and structure of castings, but it often causes the structure to be too coarse, which will also lead to the deterioration of mechanical properties such as strength, while After homogenizing annealing at high temperature for a long time, forging and other treatments are carried out to break the coarse grain structure. From the perspective of operational feasibility, on the one hand, the forging of large-scale copper alloy components has high requirements on the output capacity of the forging equipment itself, which is not easy to meet. On the other hand, On the one hand, the forging temperature of large parts is high, and when the residence time exceeds a certain limit, it is easy to cause the precipitation and coarsening of CuNiSiCr alloy precipitates, which makes it difficult for the alloy to return to a higher performance level after forging, and the post-processing space is small

Method used

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  • Heat treatment method capable of improving performance stability of medium/high-tonnage smelted CuNiSiCr alloy
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  • Heat treatment method capable of improving performance stability of medium/high-tonnage smelted CuNiSiCr alloy

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Experimental program
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Effect test

Embodiment 1

[0037] Embodiment 1 (CuNiSiCr alloy)

[0038] 1) For a 25mm thick smelted CuNiSiCr solid solution alloy plate, solid solution at 950°C for 2h, water quenching, the average grain size is 100μm;

[0039] 2) Cold rolling is used to cold deform the CuNiSiCr alloy plate, and the deformation amount is about 50%;

[0040] 3) Recrystallize the cold deformed alloy at 840°C for 1 hour;

[0041] 4) Observe the recrystallized grains. The average grain size is about 50 μm, which meets the service requirements and does not need repeated recrystallization;

[0042] 5) Aging the recrystallized CuNiSiCr alloy at 450-540°C for 3 hours.

[0043] Such as figure 1 As shown, the average grain size of the ex-factory state is about 75 μm, and it can be seen that the precipitated phase particles are obvious, and the solid solution state is not good;

[0044] Such as figure 2 As shown, after solid solution at 950°C for 2 hours, the precipitated phase particles have been greatly reduced, indicatin...

Embodiment 2

[0046] Embodiment 2 (CuNiSiCr alloy)

[0047] 1) For a 25mm thick smelted CuNiSiCr solid solution alloy plate, solid solution at 950°C for 2h, water quenching, the average grain size is 100μm;

[0048] 2) Cold rolling is used to cold deform the CuNiSiCr alloy plate, and the deformation amount is about 50%;

[0049] 3) Recrystallize the cold deformed alloy at 870°C for 1 hour;

[0050] 4) Observe the recrystallized grains. The average grain size is about 50 μm, which meets the service requirements and does not need repeated recrystallization;

[0051] 5) Aging the recrystallized CuNiSiCr alloy at 450-540°C for 3 hours.

[0052] Such as figure 1 As shown, the average grain size of the ex-factory state is about 75 μm, and it can be seen that the precipitated phase particles are obvious, and the solid solution state is not good;

[0053] Such as figure 2 As shown, after solid solution at 950°C for 2 hours, the precipitated phase particles have been greatly reduced, indicatin...

Embodiment 3

[0055] Embodiment 3 (CuNiSiCr alloy)

[0056] 1) For a 25mm thick smelted CuNiSiCr solid solution alloy plate, solid solution at 950°C for 2h, water quenching, the average grain size is 100μm;

[0057] 2) Cold rolling is used to cold deform the CuNiSiCr alloy plate, and the deformation amount is about 50%;

[0058] 3) Recrystallize the cold deformed alloy at 900°C for 1 hour;

[0059] 4) Observe the recrystallized grains. The average grain size is about 50 μm, which meets the service requirements and does not need repeated recrystallization;

[0060] 5) Aging the recrystallized CuNiSiCr alloy at 450-540°C for 3 hours.

[0061] Such as figure 1 As shown, the average grain size of the ex-factory state is about 75 μm, and it can be seen that the precipitated phase particles are obvious, and the solid solution state is not good;

[0062] Such as figure 2 As shown, after solid solution at 950°C for 2 hours, the precipitated phase particles have been greatly reduced, indicatin...

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Abstract

The invention discloses a heat treatment method capable of improving the performance stability of a medium / high-tonnage smelted CuNiSiCr alloy. Due to the sufficient utilization of the reasonable coordination between solution temperature and time as well as appropriate cold deformation and recrystallization temperature in the method, on one hand, the component uniformity of large parts can be promoted as much as possible, and on the other hand, the amplitude of material performance lowering caused by crystal grain and precipitated phase coarsening is also reduced; and the process is beneficial to the guarantee that a large CuNiSiCr alloy structural member has relatively good production repeatability and performance stability, and the alloy performance can be still kept at a relatively high level. By using the heat treatment method, the relatively high solution temperature and relatively long solution time can be guaranteed, the uniformity of components and structures in large structural members can be sufficiently promoted, and the influence proportion and degree of weak areas caused by nonuniformity problems in the large structural members are reduced; and the technical method designed by the invention is simple, feasible and high in operability.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of heat treatment technology and relates to a heat treatment method capable of improving the performance stability of CuNiSiCr alloy smelted with medium and high tonnage. [0003] 【Background technique】 [0004] In the preparation of medium and high tonnage CuNiSiCr alloys, especially when the monomer mass exceeds 1t, traditional melting and casting has become a more feasible method, but it faces serious problems of composition and structure uniformity. The common problem exists. This inhomogeneity makes the local area of ​​the large part a weak point. Under the action of external conditions, it is easier to fail first and then expand to the whole, causing huge losses. [0005] Generally speaking, homogenizing annealing at high temperature for a long time on castings is beneficial to alleviate and solve the inhomogeneity in the composition and structure of castings, but it often causes the structure to be too ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/08C22F1/02
CPCC22F1/002C22F1/02C22F1/08
Inventor 江峰吴亚科鲁军勇孙军
Owner 深圳市卡德姆科技有限公司
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