TC21钛合金电子束焊接件疲劳断口定量反推研究  

Quantitative Reverse Deduction from Fatigue Fracture of TC21Ti Alloy Joint with Electron Beam Welding

作　　者：郑志腾 有移亮[1] 刘新灵[2] 张峥[1] 路浩天 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100191 [2]北京航空材料研究院,北京100095 [3]中航工业综合技术研究所,北京100028

出　　处：《材料工程》2013年第11期50-56,共7页Journal of Materials Engineering

摘　　要：对TC21钛合金电子束焊接接头的疲劳断口进行了基于宏观扩展区面积和微观疲劳条带的定量分析。结果表明:在断裂韧性大小相同的情况下,可由扩展区面积反推构件承受的应力,反推计算所得应力与实际加载疲劳应力的相对误差在10%以内;疲劳裂纹稳定扩展第二阶段的显微特征是疲劳条带,利用Paris公式反推焊接结构的原始疲劳质量,原始疲劳质量呈正态分布,实验结果对钛合金电子束焊接结构的工艺评定具有重要的工程意义。Based on the macroscopical propagation site area and microscopic fatigue striations of the fa- tigue fracture of titanium alloy joint with electron beam welding, fatigue stress and initial fatigue qual- ity （IFQ） was estimated, respectively. The results show that the area of propagation zone can well es- timate the stress at the same fracture toughness. And the relative error can be confined less than 10%. The microscopic characteristic of fatigue crack propagation at the second stage if fatigue stria- tion. The IFQ estimated through Paris formula presents a normal distribution and the results have im- portant engineering significance for the assessment of electron beam welded titanium alloy structure.

关 键 词：钛合金 电子束焊接 断口定量反推 疲劳应力 原始疲劳质量 

分 类 号：TG115.21[金属学及工艺—物理冶金]