摘要
初步研究了拉应力和合金成分对Ｔｉ８１１合金棒材热盐应力腐蚀（ＨＳＳＣ）性能的影响。结果表明：Ａｌ含量小于８．０ｗｔ％时，Ａｌ、Ｍｏ、Ｖ含量的变化对合金ＨＳＳＣ性能无明显影响；Ａｌ含量大于８．０ｗｔ％，随Ａｌ含量升高，ＨＳＳＣ性能明显下降，而Ｍｏ、Ｖ含量可改善其性能；当拉应力由１４７ＭＰａ升高到１９６ＭＰａ，ＨＳＳＣ性能明显降低。在实验基础上，提出了ＨＳＳＣ断裂模型，盐蚀区有Ｃｌ－，Ｎａ＋等存在，产生微裂纹，裂纹沿原β晶界扩展，最终导致断裂。
he influences of alloying compostions and tensile stress on the heat-salt stress-corrosion (HSSC) behaviour of Ti811 alloy rods are studied. The results indicate that the variations of Al, Mo and V contents have no evident effect on its HSSC properties if Al content is less than 8wt%, If Al content is greater than 8wt%, its HSSC properties decrease obviously, while its properties are improved with the increasing of Mo and V contents. Its HSSC properties decrease greatly with the increasing of tensile stress from 147MPa to 196MPa. On the basis of experimental facts, a new HSSC cracking model is proposed. The results of EDAX suggest that there exist Cl- and Na+ ions in corrosive zone of salt, and this region is brittle cleavage fracture, where cracks propagate along initial β grain boundary.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
1995年第2期27-33,共7页
Rare Metal Materials and Engineering
关键词
拉应力
应力腐蚀
断裂
钛合金
拉伸试验
Ti-8Al-1Mo-1V alloy HSSC mechanical properties cracking
