Effects of Heat Treatment Process on Microstructure and Mechanical Properties of GH4169 Superalloy
The microstructure evolution and mechanical properties of GH4169 superalloy were studied using two typical heat treatment processes.The results indicate that,the yield strength of GH4169 superalloy are significantly increased under the heat treatment process compared with that of the hot rolled state,mainly due to the strengthening effect of the precipitated phases during the heat treatment.Standard heat treatment not only achieves higher strength at room temperature but also maintains high temperature strength,but the high-strength heat treatment effectively improves the impact toughness.The increase of the solid solution temperature leads to the δ phase dissolution and the coarsening of the austenite grain size,which weakens the strengthening effect of the fine crystals,this is the main reason for the decrease in sample strength in high-strength heat treatment states.Although from the perspective of impact fracture morphology,both heat-treated state samples show a microporous aggregate fracture mode,the toughness size of high strength heat treatment is deeper,which is beneficial to improve the impact toughness.
万方数据
维普
