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

作　　者：马闯 刘让贤[1] 文武 夏青 MA Chuang;LIU Rang-xian;WEN Wu;XIA Qing(Zhangjiajie Institute of Aeronautical Engineering,Zhangjiajie Hunan 427000,China;China Productivity Center for Machinery Co.,Ltd.,Beijing 100044,China)

机构地区：[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

出　　处：《机电产品开发与创新》2024年第5期7-9,共3页Development & Innovation of Machinery & Electrical Products

基　　金：湖南省教育厅科学研究项目(22C1375)。

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。TA15 alloy was repaired by laser deposited repair with various heat treatments,and the fatigue crack nucleation and growth behaviors were investigated.Fatigue fracture surfaces were analyzed using a scanning electron microscope.Results indicate that the median fatigue 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 region is characterized by the crystallographic cleavage facets ofαlamellae 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 

分 类 号：TH114[机械工程—机械设计及理论]