Effects of hot isostatic pressing and heat treatment on microstructure and mechanical properties of Mar-M509 alloy prepared by SLM
Cobalt-based superalloys have broad application prospects in aero-engines and gas turbines due to their high melting point,excellent cold and thermal fatigue resistance,and good welding performance. In this work,the Mar-M509 cobalt-based superalloy sample prepared by SLM technology was taken as the research ob-ject. The hot isostatic pressing was used as a post-processing to solve the micro-crack problem in the SLM sam-ple,and the heat treatment was used to compare the changes of microstructure and mechanical properties during the post-processing. The results show that there is almost no difference in the microstructure characteristics of the samples after hot isostatic pressing and heat treatment,but the presence of microcracks is no longer observed af-ter hot isostatic pressing. During the post-treatment process,recovery,recrystallization and grain growth occurred in the sample. The coarse grains reduce the strength of the sample and increased the elongation. Heat treatment has little effect on microcracks,so there is still obvious anisotropy of tensile properties in the heat-treated sam-ples,while the mechanical properties of the hot isostatic pressing samples are not much different on different planes,indicating that the microcracks are eliminated after hot isostatic pressing.
NETL
NSTL
万方数据
