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TC4钛合金焊接接头组织不均匀性与疲劳性能
引用本文:李清华,胡树兵,李行志,肖建中,王亚军,刘昕,籍龙波.TC4钛合金焊接接头组织不均匀性与疲劳性能[J].材料工程,2010(1).
作者姓名:李清华  胡树兵  李行志  肖建中  王亚军  刘昕  籍龙波
作者单位:1. 华中科技大学,材料成形与模具技术国家重点实验室,武汉,430074
2. 北京航空制造工程研究所,北京,100024
摘    要:对TC4钛合金电子束焊接四种典型熔凝区形状(钉形、漏斗形、楔形和钟罩形)焊接接头的微观组织进行了观察分析,并采用多晶局域梯度模型表征焊缝组织不均匀性,通过疲劳实验,建立焊接接头的组织不均匀性和疲劳性能的关系。结果表明:焊缝上端纵向柱状晶长度尺寸梯度变化较大的楔形形貌焊接接头疲劳寿命较低,梯度变化较小的钟罩形焊缝形貌接头疲劳寿命较高;疲劳裂纹多萌生于横向区域硬度梯度变化较大的热影响区和熔合线区域。

关 键 词:TC4钛合金  电子束焊接  多晶局域梯度模型  疲劳  

Microstructure Heterogenicity and Fatigue Property of Weld Joints of TC4 Titanium Alloy
LI Qing-hua,HU Shu-bing,LI Xing-zhi,XIAO Jian-zhong,WANG Ya-jun,LIU Xin,JI Long-bo.Microstructure Heterogenicity and Fatigue Property of Weld Joints of TC4 Titanium Alloy[J].Journal of Materials Engineering,2010(1).
Authors:LI Qing-hua  HU Shu-bing  LI Xing-zhi  XIAO Jian-zhong  WANG Ya-jun  LIU Xin  JI Long-bo
Institution:1 State Key Laboratory of Material Processing and Die & Mould Technology;Huazhong University of Science & Technology;Wuhan 430074;China;2 Beijing Aeronautical Manufacturing Technology Research Institute;Beijing 100024;China
Abstract:Local gradient simulation technology was used as a new method to describe the microstructure heterogenicity of TC4 weld joints,by observing the microstructure,testing the dimension of columnar grains,the lateral microhardness and conducting the fatigue experiment.The results show that the heterogenicity of the microstructure has an influence on the fatigue property of the weld joints.Fatigue life of the bell shaped weld joint with relatively homogeneous microstructure is higher than the wedge shaped weld jo...
Keywords:TC4 alloy  electron beam welding  local gradient simulation technology  fatigue property  
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