摘要
对TA15钛合金和304不锈钢的电子束焊接进行了研究,对接头显微组织、相组成和显微硬度进行了分析.结果表明,TA15与304不锈钢电子束焊接性较差,在较小的热应力下即在焊缝内产生大量裂纹.焊缝内生成连续分布的化合相,主要包括TiFe2,TiFe,Cr2Ti等,脆性化合物的产生是裂纹形成的根本原因.焊缝区内显微硬度明显高于母材,且TiFe2的硬度高于TiFe相,贯穿裂纹在TiFe2相富集的区域产生.二者的直接电子束焊接难以实现,需要添加中间层以改善焊缝的冶金条件,改变化合物的种类和分布,从而实现可靠连接.
Electron beam welding experiment of TA15 ti tanium alloy to 304 stainless steel was carried out.Microstruc-ture and micro-hardness distribution of joint were examined.The results showed that the weldability of electron beam welding of TA15 titanium alloy to 304 stainless steel was so poor that many cracks in the whole weld zone were produced.The weld zone was characterized by a large amount of continuously distributed com-pounds such as TiFe2,TiFe and Cr2Ti.The formation of these kinds of brittle compounds was the main reason of the cracks.The micro-hardness in weld zone was much higher than that in base metal.And TiFe2 phase was harder than TiFe phase,so the throughout crack was found in the TiFe2-rich zone.Direct elec-tron beam welding of these two alloys was hardly completed.Some interlayer alloys have to be used to improve the metallurgi-cal condition and change the kind and distribution of the com-pounds.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2010年第5期53-56,共4页
Transactions of The China Welding Institution
基金
中国航天联合技术创新资助项目
