摘要
本文主要对钛合金及其扩散焊疲劳特性研究进展进行了综述,总结了钛合金及其焊接后疲劳裂纹萌生和扩展的规律。概述了钛合金的化学成分和分类,以及常用焊接方法,重点介绍扩散焊的特点和优势。描述了循环载荷作用下滑移带形成和位错的运动现象,阐明疲劳裂纹萌生的机制。钛合金微观组织的选择是优化力学性能的常见方法,现有研究表明,制备层合结构是降低钛合金疲劳裂纹扩展速率的一种重要调控手段。不合适的焊接工艺参数会导致接头缺陷的形成,后续热处理能够降低接头缺陷,并提高焊接构件的疲劳寿命和疲劳强度。最后,简述了扩散焊制备多层和异种钛合金层合结构来实现构件高损伤容限的可行性。
This paper concentrates on the research progress of titanium alloys and their diffusion bonding fatigue characteristics,and summarizes the laws of fatigue crack initiation and growth of titanium alloys with/without welding.The chemical composition,classification,and common welding method of titanium alloys are stated,with emphasis on the features and advantages of diffusion bonding.The phenomena of slip band formation and dislocation movement under cyclic loading are described,and the mechanism of fatigue crack initiation is clarified.The selection of microstructures is a common method to optimize mechanical properties of titanium alloys.Previous studies suggested that the laminated structure is an important mode to realize the low fatigue crack growth rate of titanium alloys.Improper parameters of the welding process can cause joint defects,and further heat treatment can reduce joint defects while improving the fatigue life and strength.Finally,the multilayer and heterogeneous laminates of titanium alloys produced by diffusion bonding are briefly described to realize the possibility of high damage tolerance.
作者
李细锋
李天乐
安大勇
吴会平
陈劼实
陈军
LI Xifeng;LI Tianle;AN Dayong;WU Huiping;CHEN Jieshi;CHEN Jun(Institute of Forming Technology&Equipment,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200030,China)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第4期473-485,共13页
Acta Metallurgica Sinica
基金
国家自然科学基金项目Nos.51875350和52105383。
关键词
钛合金
扩散焊
层合结构
疲劳裂纹萌生
裂纹扩展
titanium alloy
diffusion bonding
laminated structure
fatigue crack nucleation
crack growth
