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研究了2种典型的热处理工艺(1#,600℃,4hAC;2#,850℃,1hWQ+550℃,6hAC)条件下Ti40合金的组织、室温拉伸性能、热稳定性能和蠕变性能。结果表明,2种工艺热处理后微观组织的差异主要在于晶界的影响,1#工艺热处理后合金保留锻造后的弯曲晶界,2#工艺热处理后微观组织的晶界清晰平直。对力学性能的测试结果表明,2种组织对室温拉伸性能影响不大。相对于平直晶界,弯曲晶界有较好的热稳定性能和较低温度的蠕变性能,而平直晶界高温蠕变性能好。
The microstructure, tensile properties, thermal stability and creep properties of Ti40 alloy were studied under two typical heat treatment conditions (1 #, 600 ℃, 4hAC; 2 #, 850 ℃, 1hWQ + 550 ℃, 6hAC) The results show that the difference of the microstructure after heat treatment of the two kinds of process mainly lies in the influence of the grain boundary. The retained austenite grain boundary after forging process of the No.1 heat treatment is clear and the grain boundary of the microstructure is clear and straight after the heat treatment of the 2 # process. The test results on the mechanical properties show that the two kinds of microstructure have little effect on the tensile properties at room temperature. Relative to the flat grain boundaries, the bending grain boundaries have better thermal stability and lower temperature creep properties, while the flat grain boundaries have good creep properties at high temperature.