(西北有色金 屬研究院，西安 710016;
寶雞有色金屬加工廠，寶雞 721014)
摘 要: Ti-8Al-1Mo-1V(Ti811)合金對(duì)熱鹽應(yīng)力腐蝕(HS SC)較敏感，單個(gè)因素對(duì)合金HSS行為影響已有研究， 而復(fù)合因素的影響研究很少。 采用工業(yè)生產(chǎn)的Ti811合金棒材，雙重退火后， 研究了熱暴露和熱鹽暴露的交互作用對(duì)合金H SSC性能的影響。 結(jié)果表明： 425℃實(shí)驗(yàn)條件下， 熱暴露和熱鹽暴露交互作用與單熱鹽應(yīng)力腐蝕相比使合金的HSSC性能明顯降低。 延伸率由18%降至6%；合金中存在位錯(cuò)在晶界處塞積誘發(fā)的沿晶裂紋， 腐蝕產(chǎn)物易于在裂紋尖端積聚。 導(dǎo)致沿晶斷裂， 加速腐蝕 。 此外, 瑺在交互作用過(guò)程中，金中α2(Ti3Al)脆性相的析出以及晶間β相發(fā)生轉(zhuǎn)變，使合金的HSSC敏感性增大， 并加速熱鹽應(yīng)力腐蝕。
關(guān)鍵字: Ti811合金 熱暴露 熱鹽暴露 熱鹽應(yīng)力腐蝕
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
