冷变形及热处理对GH738镍基合金组织与性能的影响

doi:10.13251/j.issn.0254-6051.2025.03.004

金属热处理 ›› 2025, Vol. 50 ›› Issue (3): 25-31.DOI: 10.13251/j.issn.0254-6051.2025.03.004

冷变形及热处理对GH738镍基合金组织与性能的影响

王畅^1,2, 王良¹, 周培山¹, 申文竹¹, 王斌¹

1.西南石油大学新能源与材料学院, 四川成都 610500;
2.中国第二重型机械集团德阳万航模锻有限责任公司, 四川德阳 618000

收稿日期:2024-10-16 修回日期:2025-01-08 出版日期:2025-03-25 发布日期:2025-05-14
通讯作者: 王斌,教授,博士,E-mail:wangbincn89@163.com
作者简介:王畅(2000—),男,硕士研究生,主要研究方向为高温合金,E-mail:2352754415@qq.com。
基金资助:
四川省科技计划项目(2021YFG0364)

Influence of cold deformation and heat treatment on microstructure and properties of GH738 nickel-based alloy

Wang Chang^1,2, Wang Liang¹, Zhou Peishan¹, Shen Wenzhu¹, Wang Bin¹

1. School of New Energy and Materials, Southwest Petroleum University, Chengdu Sichuan 610500, China;
2. China National Erzhong Group Deyang Wanhang Die Forging Co., Ltd., Deyang Sichuan 618000, China

Received:2024-10-16 Revised:2025-01-08 Online:2025-03-25 Published:2025-05-14

摘要/Abstract

摘要： 对GH738镍基高温合金进行3种变形量(10%、20%、30%)的冷变形及1040 ℃×0.5 h退火+800 ℃×8 h时效+600 ℃×8 h时效热处理,探索不同工艺下合金的微观组织与力学性能变化。结果表明,GH738镍基合金主要由γ′相、γ相、TiC和Cr₂₃C₆相组成。随着变形量的增加,热处理态GH738镍基合金的晶粒尺寸逐渐减小,由固溶态的44.41 μm逐渐减小至22.03 μm;析出相γ′相逐渐回溶于基体,其尺寸趋于统一并由165 nm减小至102 nm。冷变形及热处理工艺能显著提升GH738镍基合金的抗拉强度、屈服强度和硬度,一定程度上改善合金的塑韧性。

关键词: 镍基合金, 显微组织, 力学性能, 热处理

Abstract: GH738 nickel-based superalloy was subjected to three deformation levels (10%, 20%, 30%) of cold deformation, followed by heat treatment consisting of annealing at 1040 ℃ for 0.5 h, aging at 800 ℃ for 8 h, and further aging at 600 ℃ for 8 h. The changes in microstructure and mechanical properties of the alloy under different processing conditions were investigated. The results show that the GH738 nickel-based superalloy primarily consists of γ′, γ, TiC, and Cr₂₃C₆ phases. As the deformation level increases, the grain size of the heat-treated GH738 nickel-based superalloy gradually decreases from 44.41 μm in the solution-treated state to 22.03 μm. The γ′ precipitates gradually redissolve into the matrix, with their size becoming more uniform and decreasing from 165 nm to 102 nm. Cold deformation and heat treatment significantly enhance the tensile strength, yield strength, and hardness of the GH738 nickel-based superalloy, and to some extent, improve the alloy's ductility and toughness.

Key words: nickel-based alloy, microstructure, mechanical properties, heat treatment

中图分类号:

TG146.23

王畅, 王良, 周培山, 申文竹, 王斌. 冷变形及热处理对GH738镍基合金组织与性能的影响[J]. 金属热处理, 2025, 50(3): 25-31.

Wang Chang, Wang Liang, Zhou Peishan, Shen Wenzhu, Wang Bin. Influence of cold deformation and heat treatment on microstructure and properties of GH738 nickel-based alloy[J]. Heat Treatment of Metals, 2025, 50(3): 25-31.

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冷变形及热处理对GH738镍基合金组织与性能的影响

Influence of cold deformation and heat treatment on microstructure and properties of GH738 nickel-based alloy

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