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850℃保温2 h后随炉冷却退火工艺处理,并与焊态焊接接头的组织性能进行比对分析,结果表明,热处理态焊接接头焊缝中由α_(p)相、α_(s)相集束及点状分布的残留β相构成,没有发现焊态焊缝中的α’马氏体组织;热处理态焊接接头强度降低但断后伸长率和常温冲击韧性增加;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.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,另外还发现了较为明显且尖锐的β相(110)衍射峰.
The welding of TC4 titanium alloy plate was carried out by means of laser welding with filler wire and self-developed flux-cored wire,and the obtained welding joint was treated with 850℃heat preservation for 2 hours and then cooled and annealed with furnace,the microstructure and mechanical properties of the welded joint were compared with those of the welded joint.The results showed that the welded joint was composed of α_(p) phase,α_(s) phase and β phase,theα'martensite structure was not found in the as-welded joint,the strength of the as-welded joint decreased,but the elongation and impact toughness at room temperature increased,and the tensile fracture of the as-welded joint was surrounded by a large number of tearing lips,the dimples are deep and uniform,showing microporous polymerized ductile fracture.It was found by XRD that the as-welded joint was mainly composed ofα'martensite,and a few weak multi-angleαphase diffraction peaks were observed,and the central angle ofαphase diffraction peaks in the heat-treated joint was the same as that in the as-welded joint,in addition,a rather sharp diffraction peak of β phase(110)was found.
作者
方乃文
黄瑞生
武鹏博
马一鸣
孙徕博
曹浩
邹吉鹏
FANG Naiwen;HUANG Ruisheng;WU Pengbo;MA Yiming;SUN Laibo;CAO Hao;ZOU Jipeng(Harbin Welding Institute Limited Company,Harbin 150028,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2023年第3期61-69,I0006,共10页
Transactions of The China Welding Institution
基金
国家重点研发计划资助项目(2021YFB3401100)
黑龙江省头雁行动计划-能源装备先进焊接技术创新团队资助(201916120)
新型钎焊材料与技术国家重点实验室开放课题(SKLABFMT202005)。
关键词
钛合金
激光填丝焊
组织性能
titanium alloy
laser filler wire welding
microstructure and properties