电焊机2017，Vol.47Issue(6)：82-87,6.DOI:10.7512/j.issn.1001-2303.2017.06.18
热处理对100mm厚TC4钛合金电子束焊接接头性能的影响
Effect of heat treatment on mechanical properties of welded joint of electron beam welding for TC4 titanium alloy with 100 mm thickness
摘要
Abstract
The welded joints of TC4 titanium alloy plates with thickness of 100 mm are obtained after electron beam welding.The welded joints are divided into three groups.The first group is treated with 850 ℃ recrystallization annealing treatment,the second one is treated with 920 ℃ +2 h and 500 ℃+4 h solid solution and ageing heat treatment and the third one maintains welded state.The microstructure,micro-hardness and tensile properties of different joints are evaluated.The results show that after recrystallization annealing treatment,the β phase boundaries begin to appear in the middle part of the welds,acicular α'phase reduces near the fusion lines in the heat affected zone,and equal axis β phase boundaries begin to appear.After solid solution and ageing heat treatment,the β phase boundaries clearly appeared in the middle and bottom parts of the welds,the equal axis β phase boundary is clearly visible near the fusion lines in the heat affected zone.The mechanics performance testing shows that the micro-hardness of weld zone,heat affected zone and base metal zone of second group joints are all significantly higher than that of the third group joints,the tensile strength of second group joints increases by 11.3％ and its yield strength increases by 17.2％,but its elongation reduces nearly 59％.关键词
大厚度钛合金/电子束焊接/热处理/力学性能Key words
large-thickness titanium alloy/electron beam welding/heat treatment/mechanical properties分类
矿业与冶金引用本文复制引用
房卫萍,黎小辉,张宇鹏,罗子艺,余陈..热处理对100mm厚TC4钛合金电子束焊接接头性能的影响[J].电焊机,2017,47(6):82-87,6.基金项目
广东省科技项目(2012A061400011,2015B050502008,2016B070701025) （2012A061400011,2015B050502008,2016B070701025）
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