航空材料学报2011，Vol.31Issue(1)：13-19,7.DOI:10.3969/j.issn.1005-5053.2011.1.003
热连轧Ti-6Al-4V合金的蠕变行为及影响因素
Creep Behaviors and Influencing Factors of Hot Rolling Ti-6Al-4V Alloy
摘要
Abstract
By means of creep curves measurement and microstructure observation, the influence of three preparing technics ( hot rolling, long-term aging and solution aging) on the microstructure and creep properties of Ti-6Al-4V alloy is investigated. Results show that, under the applied stress of 575 MPa at 400℃ , the hot rolled Ti-6Al-4V alloy displays a shorter creep lifetime about 70h, but after long-term aging and solution + aging, the creep lifetimes of the alloy at the same testing conditions are prolonged to 230h and 548h,respectively. Microstructure of the hot rolled alloy consists of band-like α phase and network αphase. After long-term aging, significant amount of β particles are precipitated in the α phase. After solution + aging, the microstructure of the ahoy consists of the network basket structure with high volume fraction and the equiaxial α phase, which is the main reason of having longer creep lifetimes. During creep, the deformation mechanism of the hot rolled alloy is the dislocation slipping activated in the α phase, while the deformation mechanism of the solution + aging alloy is the < a + c > dislocations of the wavilness activated on the pyramidal planes. As creep goes on, more dislocations in the α phase are concentrated and cause the dynamic recrystallization, which refines the grain size of the alloy. It is the synthetical effect of the network basket structure and the thinner α phase that make the solution + aging alloy have longer creep lifetime and better plasticity.关键词
热连轧Ti-6Al-4V合金/长期时效/固溶时效处理/组织结构/蠕变特征Key words
hot rolled Ti-6Al-4V alloy/ long-term aging/ solution aging/ microstructure/ creep feature分类
金属材料引用本文复制引用
田素贵,包宪宇,于慧臣,刘洋,赵忠刚,陈礼清,刘相华..热连轧Ti-6Al-4V合金的蠕变行为及影响因素[J].航空材料学报,2011,31(1):13-19,7.基金项目
国家自然科学基金资助的重点项目(50634030) （50634030）
