多次真空固溶处理对GH1131高温合金组织和力学性能的影响

利用真空高压气淬工艺研究了GH1131高温合金经1100~1170 ℃范围内多次真空固溶处理后的组织和力学性能。结果表明,固溶态组织包含奥氏体晶粒和颗粒状碳化物,且随着固溶温度的升高,晶粒度稍有增大趋势。GH1131高温合金经多次真空固溶处理后组织均匀,常温与高温力学性能稳定,经1100 ℃+1130 ℃+1170 ℃三次真空固溶处理后,晶粒度维持了6~8级,900 ℃高温抗拉强度达到200 MPa。

Effect of multiple vacuum solution treatment on microstructure and mechanical properties of superalloy GH1131

The microstructure and mechanical properties of superalloy GH1131 after multiple vacuum solution treatments at 1100-1170 ℃ were studied by using vacuum high-pressure gas quenching process. The results show that the solution treated microstructure contains austenite grains and carbide particles,and the grain size tends to increase with the increase of solution treatment temperatures. After multiple vacuum solution treatments,the microstructure of superalloy GH1131 is homogeneous and the mechanical properties at room temperature and 900 ℃ are stable. The grain size of superalloy GH1131 maintains grades 6-8 after three times vacuum solution heat treatments of 1100 ℃ +1130 ℃ + 1170 ℃,and the tensile strength at 900 ℃ reaches 200 MPa.