热处理制度对DZ408残余共晶及力学性能的影响试验研究

分析DZ408第一代定向凝固镍基高温合金的固溶温度、预处理升温阶梯对叶片残余共晶含量的影响，探讨不同热处理制度对叶片残余共晶及力学性能的影响。结果表明:随着固溶温度的升高和增加预处理阶梯，残余共晶含量减少；固溶温度达初熔温度时，合金的中温持久性能降低，较多的残余共晶影响合金高温稳定性。研究给出了DZ408合金的新热处理制度。

Effect of Heat Treatment on Residual Eutectic and Mechanical Property of DZ408 Alloy

This paper aims at analyzing the effect of solution temperature and preheat treatment on residual eutectic of blades of the first-generation directional solidification nickel-based superalloy DZ408, in order to discuss the effect of different heat treatment on residual eutectic and mechanical property. The results suggest that the amount of the residual eutectic decreases with the solution temperature increasing and staged preheat treatment. The stress-rupture property at intermediate temperature decreases when the solution temperature reaches the incipient melting temperature. The high temperature stability is influenced by more residual eutectic. According to the analysis results, a new heat treatment rule was put forward.