(西北有色金 属研究院，西安 710016;
宝鸡有色金属加工厂，宝鸡 721014)
摘 要: Ti-8Al-1Mo-1V(Ti811)合金对热盐应力腐蚀(HS SC)较敏感，单个因素对合金HSS行为影响已有研究， 而复合因素的影响研究很少。 采用工业生产的Ti811合金棒材，双重退火后， 研究了热暴露和热盐暴露的交互作用对合金H SSC性能的影响。 结果表明： 425℃实验条件下， 热暴露和热盐暴露交互作用与单热盐应力腐蚀相比使合金的HSSC性能明显降低。 延伸率由18%降至6%；合金中存在位错在晶界处塞积诱发的沿晶裂纹， 腐蚀产物易于在裂纹尖端积聚。 导致沿晶断裂， 加速腐蚀 。 此外, 瑺在交互作用过程中，金中α2(Ti3Al)脆性相的析出以及晶间β相发生转变，使合金的HSSC敏感性增大， 并加速热盐应力腐蚀。
关键字: Ti811合金 热暴露 热盐暴露 热盐应力腐蚀
OF Ti811 ALLOY
（Northwest Institute for Nonferrous Metal Research, Xi'an 710016, P. R. China
Baoji Nonferrous Metal Works, Baoji 721014, P. R. China）
Abstract:Ti811(Ti-8Al-1Mo-1V) alloy is sensitive to hot salt stress corrosion (HSSC), effects of single factor on the alloy's HSSC behavior were studied, but the effects of compound factors on its HSSC behavior have been seldom reported. Effects of interaction between hot exposure and hot salt exposure on its HSSC behavior were studied, the results indicate that interaction between hot exposure and hot salt exposure leads to an obvious decrease of HSSC properties compared with that of hot salt exposure, for example, its elongation reduces from 18% to 6%; dislocations pile-up appear on grain boundary, which induces micro-cracks along grain boundary and leads to intergranular cracking. In addition, α2(Ti3Al) phase precipitates and intergranular β transforms during the interaction process, its HSSC sensitivity increases and HSSC is accelerated.
Key words: Ti811 alloy hot exposure hot salt exposure hot salt stress corrosion
