与扩展的影响
(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)
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。
关键字: Ti153合金；冷轧板；晶界；滑移带；疲劳短裂纹
fatigue crack initiation and propagation in Ti-15-3 sheet
（1. Representative Office of PLA Navy to Anshan Iron and Steel Group Corporation, Anshan 114000, China;
2. Key Laboratory of Ministry of Education for Electromagnetic Processing of Materials,
Northeastern University, Shenyang 110004, China）
Abstract: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.
Key words: Ti-15-3 alloy; cold-rolled sheet; grain boundary; sliding band; fatigue short crack
