固溶处理温度对GH738合金组织和性能的影响

Effect of Solid Solution Treatment Temperature on the Microstructure and Mechanical Properties of GH738 Alloy

采用金相显微镜、扫描电镜和材料试验机研究了GH738合金在不同固溶热处理制度下的显微组织和性能。结果表明,随着固溶温度的提高,合金的晶粒尺寸随之增大、未溶入基体的γ′相逐渐减少,新析出的γ′相逐渐长大;GH738合金中的第二相有MC和M23C6,MC主要分布在晶内,M23C6主要分布在晶界;GH738合金的室温拉伸强度、屈服强度及洛氏硬度随二次固溶温度的升高而减小。

The microstructure and properties of GH738 alloy under different solid solution heat treatment systems were studied by means of metallographic microscope, scanning electron microscope and material testing machine. The results show that with the increase of the solid solution temperature, the grain size of the alloy will increase, the γ' phase which is not dissolved in the matrix decreased, and the new γ' phase will grow up. In the second phase of GH738 alloy, MC and M23C6 are mainly distributed in the crystal, while M23C6 is mainly distributed in the grain boundary. The tensile strength, yield strength and rockwell hardness of GH738 alloy decreased with the increase of the secondary solution temperature.