钢/铅双金属结构熔滴沉积复合TIG电弧增材制造与界面组织研究  

Investigation on the Interfacial Microstructure of the Steel/Lead Bimetallic Structure Fabricated by the Hybrid TIG Arc and Droplet Deposition Manufacturing

作　　者：张永恒 杜军[1] 郭鑫鑫 魏正英[1] Zhang Yongheng;Du Jun;Guo Xinxin;Wei Zhengying(State Key Laboratory of Mechanical Manufacturing System Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学、机械制造系统工程国家重点实验室,陕西西安710049

出　　处：《稀有金属材料与工程》2023年第3期1079-1086,共8页Rare Metal Materials and Engineering

基　　金：民用航天技术预先研究(D020208);江苏高校省级重点实验室开放研究课题(KJS1809);航空科学基金(20200054070001)。

摘　　要：采用熔滴沉积复合钨极氩弧焊(TIG)电弧增材制造工艺实现了45钢/锡铅合金双金属结构的直接冶金结合。利用OM、SEM、XRD等研究了钢/铅双金属增材制造结构界面不同位置特征区域的金相组织、界面元素分布和主要物相。结果表明,采用熔滴沉积复合TIG电弧增材制造工艺成形的钢/铅双金属结构界面无明显裂纹、孔隙等宏观冶金缺陷;根据钢/铅界面金属间化合物(IMCs)的分布状态判定,铅合金熔滴在45钢表面的冲击、铺展过程中,同时存在“反应性润湿”和“惰性润湿”,反应性润湿界面存在微小波动并且界面处IMCs为FeSb2和FeSn2,惰性润湿界面未析出反应产物且存在微孔隙缺陷。熔池中心处的界面IMCs层厚最大,IMCs层厚约为6μm,随着测试位置逐渐远离熔池中心,界面IMCs层厚呈非线性递减趋势。The direct metallurgical bonding of C45 steel/tin-lead alloy bimetallic structures was achieved by the hybrid TIG arc and droplet deposition manufacturing.The microstructure,interface element distribution and main phases of the steel/lead bimetallic structure were studied by OM,SEM and XRD.The results indicate that the steel/lead bimetallic structure interface formed by the droplet deposition composite TIG arc additive manufacturing process are no obvious cracks,pores and other macroscopic metallurgical defects.According to the distribution of intermetallic compounds(IMCs)at the steel/lead interface,there is both“reactive wetting”and“inert wetting”during the impact and spreading of lead alloy droplets on the C45 steel substrate,where the reactive wetting interface has small fluctuations and the IMCs at the interface are FeSb2 and FeSn2,and the inert wetting interface does not precipitate reaction products and has tiny pore defects.The IMCs layer thickness at the center of the molten pool is the largest,and the IMCs layer thickness is about 6μm.The IMCs layer thickness at the interface shows a non-linear decreasing trend as the test position gradually moves away from the center of the molten pool.

关 键 词：钢/铅双金属结构 金属间化合物 熔融沉积成形 反应润湿 

分 类 号：TG444.74[金属学及工艺—焊接]