(西北有色金属研究院，西安 710016)
摘 要: 研究Ti-600合金d 140 mm镦制饼材固溶时效(STA)处理以及600 ℃热暴露100 h后毛坯热暴露与试样热暴露试样的室温拉伸性能，结合显微组织等的分析，探讨析出的硅化物对合金热稳定性能的影响。结果表明：经600 ℃热暴露100 h后，毛坯热暴露试样的强度较STA的稍有提高，伸长率减少20.4%。试样热暴露试样的抗拉强度降低1%左右，伸长率降低49%左右。在600 ℃热暴露100 h的过程中，合金内析出杆状不均匀分布的S2型硅化物，可使合金高温长时暴露后的塑性明显下降。
关键字: Ti-600合金；热暴露；热稳定；硅化物；塑性
（Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China）
Abstract:Ti-600 alloy pancake with the diameter of 140 mm was upset and was solutioned at 1 020 ℃ for 1 h, aged at 650 ℃ for 8 h, air cooling. The tensile properties of specimen were tested at ambient temperature for the alloy prior to and after being exposed at 600 ℃ for 100 h. Microstructures for the alloy were observed. And the influence of silicides on thermal stability was also analyzed. The results indicate that for the alloy exposed at 600 ℃ for 100 h, the strength of the sample without oxidizing layers increases a little bit, the elongation decreases by 20.4%. While for the sample with oxidizing layers, the strength decreases by 1% or so, the elongation decreases by about 49%. The abrupt decrease of the plasticity is caused by the precipitation of rod-like S2 typed silicides in the alloy during the process of thermal exposure.
Key words: Ti-600 alloy; thermal exposure; thermal stability; silicides; plasticity
