TC17 钛合金疲劳裂纹扩展速率  

Fatigue Crack Propagation Rate for TC17 Titanium Alloy

作　　者：郭萍[1] 张菁丽 强菲 辛社伟[1] Guo Ping;Zhang Jingli;Qiang Fei;Xin Shewei(Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2022年第11期4358-4362,共5页Rare Metal Materials and Engineering

基　　金：陕西省重点研发项目(2019GY-162,2020ZDLGY01-07)。

摘　　要：研究了显微组织形态对TC17钛合金疲劳裂纹扩展速率的影响,并结合裂纹扩展路径进行了分析。结果表明,对于TC17合金,在裂纹扩展的第Ⅰ阶段和第Ⅲ阶段,等轴组织随着固溶温度的升高,扩展速率加快,显微组织对中速区的裂纹扩展速率影响不大;对2种片层组织结构的裂纹扩展速率分析结果表明,仅固溶态的组织在裂纹扩展的整个阶段具有较低的裂纹扩展速率,并且起裂区对应较高的应力强度因子,裂纹在固溶态组织中的扩展路径较固溶时效态的曲折。Effect of microstructure on the fatigue crack propagation rates for TC17 titanium alloy was studied in this research, and crack growth path was analyzed. The results show that the crack growth rates increase with the temperature rising in the equiaxed structure on the step Ⅰ and the step Ⅲ during the crack growth for the TC17 titanium alloy, and the microstructure has little influence on crack growth rate of step Ⅱ. The analysis conclusions of the crack growth rates for two different lamellar microstructure show that the microstructure under the solution anneal state has lower crack growth rates during the whole crack growth, the initial fracture zone matches higher stress intensity factor, and the crack growth path in solution anneal microstructure is more zigzag than that in microstructure under solution aging state.

关 键 词：TC17钛合金 疲劳裂纹扩展速率 裂纹扩展路径 

分 类 号：TG146.23[一般工业技术—材料科学与工程]