一种镍基粉末高温合金环形件淬火开裂行为研究  

A study on quenching cracking behavior in a nickel-based P/M superalloy ring-shapedworked piece

作　　者：李科敏[1,2] 王艺星 林希楠 李阳 刘建涛[1,2] 刘明东 LI Kemin;WANG Yixing;LIN Xinan;LI Yang;LIU Jiantao;LIU Mingdong(Central Iron and Steel Research Institute,High Temperature Material Institute,Beijing 100081,China;Beijing CISRI-Gaona Materials Technology Co Ltd,Beijing 100081,China)

机构地区：[1]钢铁研究总院高温材料研究所,北京100081 [2]北京钢研高纳科技股份有限公司,北京100081

出　　处：《粉末冶金工业》2023年第3期107-110,119,共5页Powder Metallurgy Industry

基　　金：国家科技重大专项资助项目(2017-VI-0008-0078)。

摘　　要：FGH4095合金环形件在热处理淬火过程中会产生开裂行为,实验基于开裂断口的显微组织金相分析,结合淬火过程应力场和温度场的数值模拟,阐明了淬火开裂机制,并给出了解决淬火开裂的有效措施。研究认为,FGH4095环形件淬火过程中,在拉应力和氧化的共同作用下,晶界发生了动态脆化导致环形件沿着圆周方向开裂,断口呈现典型的沿晶脆断特征。通过对热处理前环形件表面涂覆抗氧化涂料可消除淬火开裂。According to the cracking behavior of FGH4095 alloy ring part in the process of heat treatment quenching,the quench cracking mechanism was clarified based on the metallographic analysis of the microstructure of the cracking fracture,combined with the numerical simulation of the stress field and temperature field in the quenching process,and the effective measures to solve the quench cracking were given.It is concluded that the dynamic embrittlement occurs in the grain boundary of FGH4095 ring part during quenching under the combined action of tensile stress and oxidation,leading to the cracking along the circumferential direction,and the fracture presents typical intergranular embrittlement characteristics.The quenching cracking can be eliminated by coating the surface of the ring part with antioxidant coating before heat treatment.

关 键 词：FGH4095 淬火开裂 数值模拟 沿晶断裂 动态脆化 应力 

分 类 号：TG156.3[金属学及工艺—热处理] TG132.3[金属学及工艺—金属学]