海洋环境下钛合金主要服役性能研究-中国材料进展

文章信息/Info

作者:: 董月成1; 2; 方志刚2; 常辉1; 淡振华1; 孙洋洋1; 李兆峰3; (1. 南京工业大学材料科学与工程学院，江苏南京 211816) (2. 中国人民解放军92228部队，北京 100072) （3. 中国船舶重工集团第七二五研究所，河南洛阳 471000）

Author(s):: DONG Yuecheng1; 2; FANG Zhigang2; CHANG Hui1; DAN Zhenhua1; SUN Yangyang1; LI Zhaofeng3; (1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China) (2. Unit 92228 of the Chinese Peoples Liberation Army, Beijing 100072, China) (3. Luoyang Ship Material Research Institute, Luoyang 471000, China)

Keywords:: titanium alloy; compressure creep; low cycle fatigue; stress corrosion

摘要:: 随着我国海洋装备对高性能材料的需求越来越紧迫，具有高比强度和优异耐腐蚀性能的钛合金受到越来越多的重视。然而，由于缺乏海洋环境下钛合金的相关服役性能数据，导致装备设计单位和应用单位选材困难，极大限制了钛合金在我国海洋工程装备上的应用。针对钛合金在海洋环境下服役面临的主要失效形式：压缩蠕变、低周疲劳和应力腐蚀，研究了不同组织形貌对TC4 ELI钛合金相关服役性能的影响，研究结果表明：TC4 ELI钛合金网篮组织的压缩蠕变性能优于双态组织；双态组织的低周疲劳性能优于魏氏组织；魏氏组织的抗应力腐蚀性能优于双态组织。可见，组织形貌对钛合金的服役性能具有重要影响，应根据具体的服役工况进行选取。

Abstract:: Titanium alloys, which possess high specific strength and excellent corrosion resistance, have received more and more attention， due to urgent demands of marine equipments for high-performance materials. However, application of titanium alloys is limited in our marine equipments due to absence of service performance data, our equipment design and application units are hesitated to choose materials type. In the present study, compressure creep, low cycle fatigue and stress corrosion property of TC4 ELI alloy with different microstructures were investigated. Results indicated that the basketweave microstructure possesses better compression creep behavior in comparison with duplex microstructure, the duplex microstructure possesses better low cycle fatigue property in comparison with Widmanstatten microstructure, and the Widmanstatten microstructure possesses better stress corrosion property in comparison with duplex microstructure. It can be seen that the microstructure has important effects on the service performance of titanium alloys, it should be selected according to the specific service conditions.