热处理对粉末冶金Inconel 718高温合金组织及性能的影响

Effect of heat treatment on the microstructure and mechanical propertiesof P/M Inconel 718 superalloy

摘要:

本文以超高转速等离子旋转电极法（SS-PREP法）制备的高球形度Inconel 718高温合金粉末为原料，采用热等静压（HIP）工艺制备了Inconel 718高温合金粉末高温合金，重点研究了热处理制度对合金组织和力学性能的影响。实验结果表明：采用SS-PREP法制得的Inconel 718高温合金粉末粒度分布均匀，球形度良好，具有优异的HIP工艺性能；随着固溶温度的增加，合金晶界逐渐变浅，说明晶界析出相数量逐渐减少。时效热处理后，沿晶界析出大量针状δ相，同时还有少量MC碳化物相。在1210℃、120MPa条件下保温保压4h的HIP工艺下，经不同固溶温度热处理后，合金室温抗拉强度可达1404MPa，650℃高温抗拉强度为1150MPa，980℃下合金综合性能较好。

Abstract:

Powder metallurgy (P/M) Inconel 718 superalloy was processed through hot isostatic pressing (HIP) route by SS-PREP powder. Effect of heat treatment on the microstructure and mechanical properties of superalloy was research. The results indicated that the distribution of size of Inconel 718 superalloy SS-PREP powder uniformity, with the fine degree of sphericity. HIP at 1210℃/120MPa for 4h, average size of grain was 50μm, tensile strength at room temperature was 1260MPa. Tensile strength at room temperature achieve to 1404MPa through solution treatment at different temperatures and two-step ageing treatment, and Tensile strength at 650℃ achieve to 1150MPa. Optimum properties of Inconel 718 superalloy appears when solution treatment at 980℃.