Ti-15-3板材中晶界特征及其对疲劳裂纹萌生与扩展的影响  

Grain boundary characterization and its influence on fatigue crack initiation and propagation in Ti-15-3 sheet

作　　者：撒世勇[1] 王平[2] 

机构地区：[1]中国人民解放军海军驻鞍山钢铁集团公司军事代表室,鞍山114000 [2]东北大学材料电磁过程研究教育部重点实验室,沈阳110004

出　　处：《中国有色金属学报》2010年第B10期429-432,共4页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展计划资助项目(2005CB623707);高等学校学科创新引智计划资助项目(B07015);辽宁省自然科学基金资助项目(20082036)

摘　　要：研究Ti-15-3合金冷轧板晶界特征及其对疲劳滑移带萌生和短裂纹扩展的影响。结果表明:Ti-15-3合金冷轧板中晶界大多为大角度晶界,小角度晶界很少。在本文统计范围内,相邻晶粒取向差在40°～60°的范围内超过60%,小于15°的只占4%;大角度晶界有利于疲劳滑移带的萌生,对短裂纹穿越有阻碍作用,在小角晶界附近未发现有滑移带产生,但短裂纹很容易穿过小角度晶界。The grain boundary characterization and its influence on the fatigue sliding band initiation and short crack propagation in Ti-15-3 sheet were studied. The results show that most of the grain boundaries belong to the large-angle grain boundary, less of them belong to the small-angle grain boundary. In the present statistic scope, the adjacent grains with misoritation angle of 40°-60° are over 60%, the adjacent grains with misoritation angle less 15° are about 4%. The fatigue sliding band preferres to initiate near the large-angle grain boundary, which shows the barrier effect on the short crack propagation. And no sliding band is found near the small-angle grain boundary, but the fatigue short crack propagates across easily these small-angle grain boundaries.

关 键 词：Ti153合金 冷轧板 晶界 滑移带 疲劳短裂纹 

分 类 号：TG146.23[一般工业技术—材料科学与工程]