典型热处理工艺对Ti40合金力学性能匹配关系的影响

Matching Relationship between Effect of Typical Heat Treatments and Mechanical Properties of Ti40 Alloy

摘要:

研究了2种典型的热处理工艺（1#, 600 ℃, 4 h AC；2#, 850 ℃, 1 h WQ + 550 ℃, 6 h AC）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

Abstract:

Based on previous research of Ti40 alloy two typical heat treatments were designed, e.g. 1#, 600 ℃, 4 h AC；2#, 850 ℃, 1 h WQ +550 ℃, 6 h AC. The microstructures , mechanical properties at room-temperature, thermal stability and creep properties of the alloy treated by the two heat treatments were tested. The result show that the difference of their microstructures is mainly in the respect of their grain boundary, e.g. the grain boundary of the alloy by 1# heat treatment is unsmooth and ragged and the ones by 2# heat treatment are smooth and straight. The mechanical properties indicated the difference of the microstructures leads a little effect on properties at room-temperature. Relatively speaking, the microstructure with the unsmooth grain boundary after 1# heat treatment brings good thermal stability and creep properties at lower temperature, and the microstructure with the straight boundary after 2# heat treatment brings good creep properties at higher temperature. The mechanism of the effect of different grain boundaries on thermal stability and creep properties was also discussed in this paper