摘要
通过激光填丝焊接方法并采用自主开发设计的钛合金药芯焊丝,进行TC4钛合金板的焊接,对获得的焊接接头进行920℃/1 h+650℃/2 h固溶时效处理,并与焊态焊接接头的组织性能进行对比分析。结果表明:热处理态焊接接头焊缝由α_(p)相、α_(s)相集束、α_(gb)相典型的三态组织及点状分布的残留β相构成,未见焊态焊缝中的α’马氏体组织,使焊缝的强度-塑性-韧性得以兼顾;热处理态焊接接头强度降低但延伸率和室温冲击韧性增加;热处理态焊接接头拉伸断口由大量撕裂唇包围,韧窝深且均匀,呈微孔聚合韧性断裂。焊态焊接接头中焊缝区晶粒间的取向差大于15°的大角度晶界占比约83.78%;热处理态焊接接头焊缝中晶粒间的取向差大于15°的大角度晶界占比约为90.21%;通过XRD测试,发现焊态焊缝中主要由α’马氏体组成,还有少量极弱的多角度α相衍射峰,而热处理态焊缝中α相衍射峰中心角度位置与焊态焊缝中α’马氏体一致,另外还发现了较为尖锐的β相(110)衍射峰。
Ti-6Al-4V titanium alloy plate was welded by a laser beam with self-developed titanium alloy flux-cored wire.The welded joint was solution treated at 920°C for 1 h and aging treated at 650°C for 2 h,and its microstructure and properties were compared with those of the as-welded joint.The results show that the heat-treated welded joint is composed of a typical tri-modal microstructure containingα_(p)phase,α_(s)phase colony,andα_(gb)phase,as well as punctate distributed residueβphase.α'martensite microstructure in the as-welded joint is not found in the heat-treated joint,which makes the strength,plasticity,and toughness well balanced and maintained.The strength of the heat-treated welded joint is reduced,while elongation and impact toughness at room temperature are enhanced.The tensile fracture of the heat-treated welded joint is surrounded by massive shear lips.The dimples are deep and uniform,presenting as microvoid coalescence ductile fracture.In the as-welded joint,the proportion of large-angle grain boundaries with misorientation between grains in the weld zone greater than 15°accounts for 83.78%,and in the heat-treated welded joint,the proportion is about 90.21%.Through XRD test,it is discovered that the as-welded weld is mainly composed ofα'martensite,with a small amount of extremely weak multi-angleα_(p)hase diffraction peak.In the heat-treated weld,the central angle position ofα_(p)hase diffraction peak is consistent with that ofα'martensite in the as-welded weld,with a sharpβphase(110)diffraction peak observed as well.
作者
徐锴
王铭秋
方乃文
武鹏博
黄瑞生
孙徕博
李伟
王星星
周珍珍
李帅
张天理
Xu Kai;Wang Mingqiu;Fang Naiwen;Wu Pengbo;Huang Ruisheng;Sun Laibo;Li Wei;Wang Xingxing;Zhou Zhenzhen;Li Shuai;Zhang Tianli(Harbin Welding Institute Co.,Ltd,Harbin 150028,China;Shanghai Zhongxun Technology Co.,Ltd,Shanghai 200120,China;Beijing Jinwei Welding Material Co.,Ltd,Tianjin 301906,China;Henan International Joint Laboratory of High-Efficiency Special Green Welding,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;School of Materials Science and Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2023年第8期2665-2675,共11页
Rare Metal Materials and Engineering
基金
National Key Research and Development Plan of China(2021YFB3401100)
Heilongjiang Head Goose Action Plan-Advanced Welding Technology Innovation Team of Energy Equipment(201916120)
Open Project of the State Key Laboratory of New Brazing Materials and Technology(SKLABFMT202005)。
关键词
钛合金
激光填丝焊
热处理
组织性能
titanium alloy
laser welding with filler wire
heat treatment
microstructure and mechanical properties