激光沉积TA15钛合金的裂纹扩展行为  

Crack Propagation Behavior of TA15 Titanium Alloy by Laser Deposition

作　　者：周松 于洪远 王洪明 ZHOU Song;YU Hongyuan;WANG Hongming(School of Mechanical and Electrical Engineering,Shenyang Aerospace University,Shenyang 110136,China;Shanghai Civil Aviation College,Shanghai 200232,China)

机构地区：[1]沈阳航空航天大学机电工程学院,沈阳110136 [2]上海民航职业技术学院,上海200232

出　　处：《有色金属工程》2024年第5期26-33,共8页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(52105157);中国博士后科学基金(2023MD734242)。

摘　　要：采用标准CT试样测定了激光沉积TA15钛合金疲劳裂纹扩展速率,结合微观组织、裂纹扩展路径以及断口形貌分析疲劳裂纹扩展机理;并基于ABAQUS与FRANC 3D联合仿真的方法,模拟裂纹尖端应力强度因子并进行寿命预测。结果表明,激光沉积制造态的裂纹扩展速率低于锻造态,裂纹主要穿过片状α相(αl),少量沿αl扩展,稳定扩展区清晰可见疲劳条纹,并伴随大量的二次裂纹,瞬断区为典型的韧性断裂。另一方面,ABAQUS与FRANC 3D联合仿真计算的应力强度因子与理论值吻合较好,预测寿命相对误差低于5%,且证实了预测结果保守,验证了模拟分析的可靠性,确保了工程应用中的安全性。The fatigue crack growth rate of TA15 titanium alloy was measured by laser deposition using standard CT samples,and the fatigue crack growth mechanism was analyzed by combining the microstructure,crack propagation path and fracture morphology.Based on the method of ABAQUS and FRANC 3D co-simulation,the stress intensity factor of the crack tip was simulated and the life prediction was carried out.The results show that the crack propagation rate of the laser deposition manufacturing state is lower than that of the forging state,and the crack passes mainly through the lamellarαphase(αl),and a small amount propagates along theαl,and the fatigue fringes are clearly visible in the stable propagation zone,accompanied by a large number of secondary cracks,and the instantaneous fracture zone is a typical ductile fracture.On the other hand,the stress intensity factor calculated by ABAQUS and FRANC 3D co-simulation is in good agreement with the theoretical value,and the relative error of the predicted life is less than 5%,which confirms the conservatism of the prediction results,verifies the reliability of the simulation analysis,and ensures the safety in engineering applications.

关 键 词：激光沉积制造 TA15 裂纹扩展速率 FRANC 3D 寿命预测 

分 类 号：TG115.5[金属学及工艺—物理冶金]