固溶温度对K424合金显微组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2024.03.003

金属热处理 ›› 2024, Vol. 49 ›› Issue (3): 15-21.DOI: 10.13251/j.issn.0254-6051.2024.03.003

固溶温度对K424合金显微组织与力学性能的影响

赵鑫磊^1,2, 袁晓飞², 乔珺威¹

1.太原理工大学材料科学与工程学院, 山西太原 030024;
2.北京钢研高纳科技股份有限公司, 北京 100081

收稿日期:2023-08-27 修回日期:2024-01-03 出版日期:2024-03-25 发布日期:2024-04-24
通讯作者: 乔珺威,教授,博士,E-mail:qiaojunwei@gmail.com
作者简介:赵鑫磊(1995—),男,硕士,主要研究方向为镍基高温合金,E-mail:1908067017@qq.com。
基金资助:
中国科协航空发动机产学联合体青年人才托举工程项目;北京钢研高纳科技股份有限公司自立研发项目(GN21C13)

Effect of solution temperature on microstructure and mechanical properties of K424 alloy

Zhao Xinlei^1,2, Yuan Xiaofei², Qiao Junwei¹

1. School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan Shanxi 030024, China;
2. Beijing Cisri-gaona Materials & Technology Co., Ltd., Beijing 100081, China

Received:2023-08-27 Revised:2024-01-03 Online:2024-03-25 Published:2024-04-24

摘要/Abstract

摘要： 对K424合金进行不同温度的固溶处理((1200~1240) ℃×4 h+空冷)。对固溶后的合金进行975 ℃/196 MPa条件下的高温持久试验和室温拉伸试验,并对其显微组织进行表征。结果表明,K424合金在1220、1230和1240 ℃完全固溶并重新析出均匀、细小且立方度较高的γ'相。相较于(1200~1210) ℃×4 h不完全固溶处理,经(1220~1240)℃×4 h完全固溶处理后K424合金的持久寿命明显提高,但室温强度和塑性略低,经1220 ℃×4 h固溶处理后,K424合金的持久寿命最高,达到97.8 h,是最优固溶处理工艺。不规则的大尺寸γ'相钉扎合金晶界以及阻碍晶内位错滑移,是不完全固溶处理后K424合金室温强度和塑性略高的原因。较高的错配度和立方度、共晶基本溶解以及较高的γ'相体积分数是1220 ℃×4 h固溶处理后K424合金持久寿命最高的主要原因。

关键词: K424合金, 固溶温度, 显微组织, 力学性能

Abstract: Room temperature tensile test and the stress rupture test at 975 ℃/196 MPa were conducted in K424 alloy after solution treatment at different conditions (1200-1240 ℃×4 h, air cooling). The results show that the uniform fine γ' precipitates with high cubicity are reprecipitated in the K424 alloy after completely solution treatment at 1220, 1230 and 1240 ℃. The room temperature strength and plasticity of the K424 alloy after complete solution treatment at 1220-1240 ℃ for 4 h are slightly lower than that of incomplete solution treatment at 1200-1210 ℃ for 4 h, but the stress rupture life is higher. K424 alloy performs the highest stress rupture life (97.8 h) after treatment treatment at 1220 ℃ for 4 h, which is the optimal solution treatment process. The intragranular dislocation and grain boundary are nailed by irregular big γ' precipitates, which are responsible for the improvement of room temperature strength and plasticity of the K424 alloy after incomplete solution treatment. The higher mismatch, cubicity and γ' phase volume fraction, as well as the dissolved γ/γ' eutectics are responsible for the highest stress rupture life of the K424 alloy after complete solution treatment at 1220 ℃ for 4 h.

Key words: K424 alloy, solution temperature, microstructure, mechanical properties

中图分类号:

TG132.3

赵鑫磊, 袁晓飞, 乔珺威. 固溶温度对K424合金显微组织与力学性能的影响[J]. 金属热处理, 2024, 49(3): 15-21.

Zhao Xinlei, Yuan Xiaofei, Qiao Junwei. Effect of solution temperature on microstructure and mechanical properties of K424 alloy[J]. Heat Treatment of Metals, 2024, 49(3): 15-21.

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固溶温度对K424合金显微组织与力学性能的影响

Effect of solution temperature on microstructure and mechanical properties of K424 alloy

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