固溶处理工艺对一种镍基单晶高温合金长期时效后持久性能的影响  

Effect of Solution Treatment on Creep Rupture Properties After Long-Term Aging of Nickel-Based Single Crystal Superalloy

作　　者：王楠 刘纪德[2] 朱崇伟 张志鹏 徐伟 李金国[2] Wang Nan;Liu Jide;Zhu Chongwei;Zhang Zhipeng;Xu Wei;Li Jinguo(The State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110016,China;Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110016 [2]中国科学院金属研究所师昌绪先进材料创新中心高温结构材料研究部,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2024年第11期3129-3135,共7页Rare Metal Materials and Engineering

摘　　要：通过对一种传统镍基单晶高温合金在不同热处理工艺条件下的固溶和时效进行实验,研究了固溶时间和长期时效对合金微观组织和性能的影响。结果表明:镍基单晶高温合金较佳的热处理工艺为:1310℃/4 h(空冷)+1130℃/4 h(空冷)+899℃/16 h(空冷)。经过固溶处理后,极大程度避免不利TCP相的析出,获得尺寸较小、立方度较高的强化相γ′的微观组织。不同热处理制度下,合金持久断裂寿命和延展率相差较小。变形过程中,脆性针状TCP相优先破碎,证实其不是裂纹萌生处。而枝晶间的薄弱碳化物/基体界面提供了裂纹的源头。The effects of solution time and long-term aging on microstructure evolution and mechanical properties of a traditional nickel-based single crystal superalloy under different heat treatment conditions were studied.The results demonstrate that the best heat treatment regime is 1310℃/4 h(AC)+1130℃/4 h(AC)+899℃/16 h(AC).After the solution treatment,the precipitation of adverse phase of TCP has been avoided and thus the preferable microstructure is obtained with small size and high degree of cubic of strengtheningγ′phase.The difference in creep rupture life and elongation is slight under different heat treatment regimes.During the deformation,the brittle TCP phase is broken first,demonstrating that it is not the crack initiation.However,the weak carbide/matrix interface in inter-dendrites is the source of cracks.

关 键 词：镍基单晶高温合金 长期时效 热处理工艺 微观组织 持久性能 

分 类 号：TG146.15[一般工业技术—材料科学与工程]