碳含量和热处理对DD91镍基单晶高温合金再结晶行为的影响

doi:10.13251/j.issn.0254-6051.2025.11.010

金属热处理 ›› 2025, Vol. 50 ›› Issue (11): 66-70.DOI: 10.13251/j.issn.0254-6051.2025.11.010

碳含量和热处理对DD91镍基单晶高温合金再结晶行为的影响

杜思宇¹, 刘丽荣¹, 罗烽月², 陈昊³, 吕培森¹, 董然¹

1.沈阳工业大学材料科学与工程学院, 辽宁沈阳 110870;
2.太行实验室, 四川成都 610000;
3.空装驻北京地区第六军事代表室, 北京 100095

收稿日期:2025-06-14 修回日期:2025-09-19 发布日期:2025-12-16
通讯作者: 刘丽荣,教授,博士,E-mail:lrliu@sut.edu.cn
作者简介:杜思宇(1999—),女,硕士,主要研究方向为高温合金再结晶,E-mail:3140660169@qq.com。

Effect of carbon content and heat treatment on recrystallization behavior of DD91 nickel-based single crystal superalloy

Du Siyu¹, Liu Lirong¹, Luo Fengyue², Chen Hao³, Lü Peisen¹, Dong Ran¹

1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang Liaoning 110870, China;
2. Taihang Laboratory, Chengdu Sichuan 610000, China;
3. The 6^th Military Representative Office of Air Installation in Beijing, Beijing 100095, China

Received:2025-06-14 Revised:2025-09-19 Published:2025-12-16

摘要/Abstract

摘要： 通过真空定向凝固炉制备了两种C含量(0.045%和0.085%)的DD91镍基单晶高温合金,利用压痕法进行加载,研究热处理和C含量对其再结晶行为的影响。研究结果表明:合金中C含量的增加会使碳化物含量增加,γ/γ′共晶组织含量降低;当C含量为0.045%时碳化物形态主要为块状,当C含量为0.085%时主要形成骨架状碳化物。0.045%C铸态试样在1270 ℃以下热处理2 h后,在变形区域附近未出现再结晶;1270 ℃热处理2 h产生了枝晶状的再结晶;在1300 ℃加热条件下也发生了再结晶;γ′相溶解是再结晶产生的必要条件。在1300 ℃热处理时,随着热处理时间的延长,合金的再结晶深度均增加;MC型一次碳化物可以钉扎再结晶晶界,阻碍其向前迁移。随着C含量的增加,钉扎效应增强,C含量为0.045%的合金其再结晶深度均大于C含量为0.085%的合金。

关键词: 高温合金, 再结晶, 碳含量, 热处理

Abstract: Two types of DD91 nickel-based single crystal superalloy with C contents of 0.045% and 0.085% were prepared by vacuum directional solidification furnace, and loaded using indentation method to study the effects of heat treatment and C content on their recrystallization behavior. The results indicate that an increase in carbon content in the alloy leads to an increase in carbide content and a decrease in the content of γ/γ′ eutectic structure. When the C content is 0.045%, the carbide morphology is mainly blocky, and when the C content is 0.085%, there are mainly skeletal carbides. For the as-cast specimens with 0.045%C, no recrystallization occurs after heat treatment below 1270 ℃ for 2 h, while dendrite-shaped recrystallization occurs after heat treatment at 1270 ℃ for 2 h, and recrystallization also occurs under heating condition of 1300 ℃. The dissolution of the γ′ phase is a necessary condition for the recrystallization to occur. As the heat treatment time increases at 1300 ℃, the recrystallization depth of the alloy increases; MC type primary carbides can pin the recrystallized grain boundaries, hindering their forward migration. With the increase of C content, the pinning effect is enhanced, and the recrystallization depth of the alloy with C content of 0.045% is greater than that with C content of 0.085%.

Key words: superalloy, recrystallization, carbon content, heat treatment

中图分类号:

TG15

杜思宇, 刘丽荣, 罗烽月, 陈昊, 吕培森, 董然. 碳含量和热处理对DD91镍基单晶高温合金再结晶行为的影响[J]. 金属热处理, 2025, 50(11): 66-70.

Du Siyu, Liu Lirong, Luo Fengyue, Chen Hao, Lü Peisen, Dong Ran. Effect of carbon content and heat treatment on recrystallization behavior of DD91 nickel-based single crystal superalloy[J]. Heat Treatment of Metals, 2025, 50(11): 66-70.

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碳含量和热处理对DD91镍基单晶高温合金再结晶行为的影响

Effect of carbon content and heat treatment on recrystallization behavior of DD91 nickel-based single crystal superalloy

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