(西北有色金属研究院 钛合金研究所，西安 710016)
摘 要: 根据Ti600合金中析出物的特点，设计5种热处理工艺，研究不同热处理工艺下合金的蠕变性能。结果表明：Ti600合金经1 060 ℃固溶处理后，随着时效时间的延长，蠕变过程中动态析出效应逐渐减弱，合金对应的抗蠕变性能增强。在时效过程中，当有a2相形成时，合金具有最强的蠕变强化效应。Si元素无论是以固溶状态还是以析出状态存在，都具有蠕变强化作用，但固溶状态的强化效果优于析出状态的。固溶后时效时间的不同表明Ti600合金存在不同程度的蠕变动态析出强化效应，但是这种强化效应也伴随着析出物形成过程的扩散效应，这种扩散效应抵消了动态析出的强化效果。因此，为了强化蠕变性能，合金应该在充分时效的情况下使用。
关键字: Ti600合金；高温钛合金；蠕变；析出物
Ti600 high-temperature alloy
（Titanium Alloy Research Center, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China）
Abstract:According to the characteristics of precipitates, five heat treatment processes were designed for Ti600 high- temperature titanium alloys, and their creep properties and microstructures were tested after various heat treatments and creep exposure treatments. The results show that, after solution treatment, there is an increasing creep resistance and a decreasing creep dynamic ageing effect with increasing the ageing time. The alloy shows the strongest creep resistant effect when phase a2 forms in Ti600 alloy after ageing treatment for a long time. The Si element in solution or in silicide shows creep resistant effect, and the former is the dominating condition of Si element. The different ageing times indicate different level dynamic creep strengthening effects for alloys. However, the dynamic ageing strengthening effect is accompanied with diffusion effect, and this diffusion effect counteracts the dynamic ageing strengthening effect. Thus, for creep properties, Ti600 alloy should be used under sufficient aging condition.
Key words: Ti600 alloy; high-temperature titanium alloy; creep; precipitate
