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针对DD6单晶高温合金进行了不同固溶温度的工艺试验,研究4种不同固溶温度对合金组织、性能的影响。结果表明:合金在1320℃及1330℃两个温度下固溶处理过程中发生初熔,经1300℃及1310℃固溶处理后未发现初熔组织。和1310℃相比,在1300℃固溶处理后仍有较多的残留共晶组织。合金固溶温度由1300℃升高至1310℃时,在合金后续时效处理时析出的γ’相更加均匀、细小。高温力学性能测试结果表明,经1310℃固溶处理并两次时效处理后,DD6合金的高温拉伸和持久断裂力学性能优于1300℃固溶处理和时效处理的DD6合金。
Aiming at DD6 single crystal superalloy, the technological experiment of different solution temperature was carried out, and the effect of four different solution temperature on the microstructure and properties of the alloy was studied. The results show that the initial melt occurs during the solution treatment at 1320 ℃ and 1330 ℃, and the primary melt is not found after solution treatment at 1300 ℃ and 1310 ℃. Compared with 1310 ℃, there are still many residual eutectic structures after solution treatment at 1300 ℃. When the alloy solution temperature is increased from 1300 ℃ to 1310 ℃, the γ ’phase precipitated during the subsequent aging treatment is more uniform and fine. The test results of high temperature mechanical properties show that after heat treatment at 1310 ℃ for two times, the mechanical properties of DD6 alloy are better than that of DD6 alloy treated with 1300 ℃ solution treatment and aging treatment.