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Xinghua Tongbu Casting Co., Ltd.

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Relationship between microstructure characteristics of nickel-chromium alloy heat treatment

2019-11-16
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The following structural characteristics of nickel-chromium alloys are the theoretical basis for formulating alloy heat treatment processes.

1) Nickel-chromium alloy is an austenitic solid solution alloy. The purpose of softening the alloy can be achieved by solution treatment.

2) When the chromium carbide in the nickel-chromium alloy is cooled a high temperature, it will precipitate along the austenite grain boundary when the cooling rate is slow, which reduces the plasticity of the alloy increases the strength, which is conducive to cold drawing. In order to improve the distribution of carbides, quick cooling should be performed after solid solution to reduce the adverse effects.

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3) Nickel-chromium alloy grains grow slowly at high temperature, there is no high temperature brittleness. Therefore, the heating temperature holding time during alloy heat treatment are allowed to vary in a wide range.

Since the nickel-chromium alloy possesses the above structural characteristics, it has the following characteristics in the solution treatment process.

1) The solution temperature must ensure that the chromium carbide in the alloy is fully dissolved. The effect of solution treatment corresponds to the complete dissolution of chromium carbide.

2) The grain growth rate is slow when the alloy is at high temperature, it is sensitive to temperature holding time, allowing a wide range of changes.

3) In order to make the distribution of chromium carbide reasonable, it should be cooled quickly during solution treatment.

The above is the relevant content introduced to you by Xinghua Synchronous Casting Co., Ltd., I hope to help everyone.


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