热处理对激光沉积修复TA15疲劳性能的影响
Effect of Heat Treatment on Fatigue Properties of Laser Deposition Repair TA15 Titanium Alloy
马闯 1刘让贤 1文武 2夏青2
作者信息
- 1. 张家界航空工业职业技术学院,湖南张家界 427000
- 2. 中机生产力促进中心有限公司,北京 100044
- 折叠
摘要
应用激光沉积修复(LDR)技术对TA15钛合金进行修复试验,对试样进行多种热处理,对比研究了修复件的疲劳裂纹萌生和扩展特性.采用扫描电子显微镜分析了试样疲劳断口.结果表明,退火态试样中值疲劳寿命能达到锻造态母材的40％;固溶时效态试样中值寿命能达到退火态的1.7倍.修复后试样的疲劳行为具有很强的组织敏感性,疲劳源区有与α片层集束尺寸和形貌相同的解理断裂面;固溶时效热处理后,马氏体的产生改变了部分片层取向,使裂纹扩展速率变慢.
Abstract
TA15 alloy was repaired by laser deposited repair with various heat treatments,and the fatigue crack nucleation and growth be-haviors were investigated.Fatigue fracture surfaces were analyzed using a scanning electron microscope.Results indicate that the median fa-tigue life of the annealed specimens can reach 40％of that of the forged base metal.The median life of the solid solution-aging specimen can reach 1.7 times that of the annealed state.The fatigue properties of repaired specimens are microstructure-sensitive.The crack nucleation re-gion is characterized by the crystallographic cleavage facets of α lamellae and tearing.After solid solution-aging treatment,the formation of martensite changes the orientation of layers,resulted in a slower crack propagation rate.
关键词
激光沉积修复/钛合金/热处理/疲劳性能/裂纹扩展Key words
Laser deposition repair/Titanium alloy/Heat treatment/Fatigue properties/Crack propagation引用本文复制引用
基金项目
湖南省教育厅科学研究项目(22C1375)
出版年
2024
NETL
NSTL
万方数据