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DOI:
钛工业进展:2020,37(5):23-26
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Ti-Al-Fe低成本钛合金TIG焊焊接组织和性能研究
Study on Microstructure and Properties of Ti-Al-Fe Low Cost Titanium Alloy by TIG Welding
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中文摘要: 研究了Ti-Al-Fe低成本钛合金钨极氩弧焊焊接接头的内部质量、组织和力学性能,并与TC4钛合金进行了比较。结果表明,Ti-Al-Fe低成本钛合金焊缝表面质量良好,焊缝内部融合良好,无焊接缺陷,可焊性好; 2种合金的焊缝区宏观组织均由粗大的柱状晶和少量等轴晶组成,Ti-Al-Fe合金柱状晶组织较细,晶内由针状次生α相和少量的长条状初生α相组成; 2种合金热影响区均为粗大的等轴晶,晶内由大量初生α相和少量针状次生α相及残余β相组成; Ti-Al-Fe低成本钛合金焊缝抗拉强度达到1 204 MPa,比TC4钛合金高111 MPa。
Abstract:The internal quality,microstructure and mechanical properties of the welded joint by TIG welding of Ti-AlFe low cost titanium alloy are studied,and are compared with TC4 titanium alloy. The results show that the surface quality,the internal fusion and the weld-ability of the Ti-Al-Fe low cost titanium alloy weld is better,and there is no welding defect. The macrostructure of the weld zone is coarse columnar crystal and a small amount of equiaxed crystal,and the columnar crystal structure of Ti-Al-Fe low cost titanium alloy is finer. The microstructure is composed of acicular secondary α phase and a small amount of elongated primary α phase,and the acicular secondary α phase of TC4 titanium alloy is finer. The heat affected zone( HAZ) is coarse equiaxed crystal,and the microstructure is consists of a large number of primary α phase,a small amount of acicular secondary α phase and residual β phase.The tensile strength of Ti-Al-Fe low cost titanium alloy weld reaches 1 204 MPa,which is 111 MPa higher than that of TC4 titanium alloy.
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