材料工程2025，Vol.53Issue(11)：134-142,9.DOI:10.11868/j.issn.1001-4381.2023.000301
TA3合金焊接接头拉伸性能及变形机制研究
Tensile property and deformation mechanism of TA3 alloy welded joint
摘要
Abstract
In the aerospace field,welding serves as the primary joining process for TA3 alloy components,and the microstructure and mechanical properties of its welded joints have a significant impact on the service safety of welded components.This study compares the tensile properties of the base metal and welded specimens and studies the deformation morphology before and after tension using scanning electron microscopy combined with electron backscatter diffraction.The results show that the microstructure of TA3 alloy is equiaxed α grains before welding,and massive,acicular and serrated α grains appear after welding.The yield strength(378 MPa)and tensile strength(458 MPa)of welded specimens are higher than that of base material specimens,but the elongation is lower.The reason is that after the base meterial sample is welded,the welding temperature has the effect of aging treatment on the sample.There exists aging hardening,and the grain size inside the weld area becomes smaller,which will increase the tensile strength.Because the microhardness of the weld zone is obviously higher than that of the base metal zone,the fracture of the welded joint is located in the base meterial zone.The deformation mechanism of the weld zone is stress-induced deformation twin(2(112))[2(113)]and((2)112)[(2)113],with a Schmid factor of 0.038,exhibiting high shear stress and strong coordination of grain deformation.Deformation twins((2)112)([2(113)]also appear in the base material region,but the Schmid factor is 0.078,indicating a relatively high degree of stress concentration.关键词
TA3合金/微观组织/针状α相/晶体取向Key words
TA3 alloy/microstructure/acicular α phase/crystal orientation分类
矿业与冶金引用本文复制引用
任军强,李乐,王启,李俊琛,薛红涛,卢学峰,汤富领..TA3合金焊接接头拉伸性能及变形机制研究[J].材料工程,2025,53(11):134-142,9.基金项目
国家自然科学基金(52061025) （52061025）
河南省自然科学基金(232300421212) （232300421212）
甘肃省研究生"创新之星"项目(2023CXZX-402) （2023CXZX-402）
