Stress corrosion cracking (SCC) behavior of TA15 titanium alloy before and after 2 years exposure in marine platform and marine splashing zone was studied using WOL specimen and static displacement method. The pre-cracking condition of TA15 titanium alloy was discussed. KISOO. Of the alloy was measured using cracking ending method. Lg(Ho/df)-Ki curves were plotted and the relationship between stress field intensity factors K and velocity of crack propagation daldt was discussed. The fracture surface was inspected using SEM and the fracture characteristics were discussed.%采用恒位移WOL试样测定KISCC的原理对已在海洋平台户外和海水飞溅区暴露2a的TA15钛合金样及原始TA15钛合金样进行了应力腐蚀行为研究.探讨了TA15钛合金预制裂纹的条件,并用裂纹终止法测量应力腐蚀临界应力场强度因子,确立了应力场强度因子KISCC与裂纹瞬时扩展速率da/dt之间的联系,并绘制了lg( da/dt)-K(I)曲线.通过扫描电镜对试件断面进行了分析,对其断裂特征进行了描述.
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