摘要
钛及钛合金具有重量轻、强度高、耐高温、耐腐蚀等优良的特点,被广泛应用于航空、航天、汽车、舰船等的核心部件。因此研究如何改善钛合金的组织和力学性能、提高构件的工作可靠性,具有重要意义。脉冲电流具有多种效应,如可以促进位错运动、细化晶粒,并能自动识别金属内部微裂纹,从而实现损伤治愈。近年来,许多研究表明脉冲电流能够影响材料的微观组织,是改善材料力学性能的一种有效方法。针对脉冲电流对TA1-A纯钛、TC4钛合金、TA15钛合金、Ti2AlNb合金的组织和力学性能的影响、脉冲电流治愈钛合金板材微裂纹的数值仿真及脉冲电流参数对裂纹周围物理场分布规律的影响等进行了综述,以期为改善钛合金的成形性能和提高服役部件的使用寿命和可靠性方面的研究和应用提供参考。
Titanium and titanium alloys have many favorable merits such as lightweight,high strength,high temperature tolerance and high tolerance of corrosion,and have been widely applied in the core components in the industries of aviation,aerospace,automobile and ship.Therefore,it is of vital importance to study how to improve the microstructures and mechanical properties of titanium alloys and enhance the working reliability of parts.Electropulsing has multiple effects in that it can promote movability of dislocation,refine grains and distinguish internal microcracks inside the metal automatically to heal damages.In recent years,many researches have indicated that electropulsing is an effective approach for improving the microstructures and mechanical properties of materials.In order to provide a reference for the research and application of improving formability of titanium alloys and enhancing the lifespan and reliability of the structures,the effects of electropulsing on the microstructures and mechanical properties of TA1-A pure titanium,TC4 titanium alloy,TA15 titanium alloy and Ti2 AlNb titanium alloy,the numerical simulation of healing of micro-cracks induced by electropulsing and the effects of parameters of electropulsing on the distributions of physical fields around the crack were reviewed,to provide reference for the studies on improving the formability of titanium alloys and enhancing the service life and reliability of service parts.
作者
王忠金
宋辉
蔡舒鹏
段杰
方骁
任秀文
WANG Zhong-jin;SONG Hui;CAI Shu-peng;DUAN Jie;FANG Xiao;REN Xiu-wen(National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2019年第2期1-14,共14页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(50875061)
高等学校博士学科点专项科研基金(20092302110016)
关键词
钛合金
脉冲电流
组织演变
裂纹愈合
电-热-结构-变形耦合
titanium alloy
electropulsing
microstructure evolution
self-healing of cracks
electro-thermal-structural coupled deformation
