316L不锈钢掺杂SiC环状同轴送粉TIG熔覆层组织结构与性能  

Microstructure and properties of annular coaxial powder feeding TIG cladding layer doped with SiC for 316L stainless steel

作　　者：高辉[1] 周灿丰[1] 胡晓慧 李文龙 GAO Hui;ZHOU Canfeng;HU Xiaohui;LI Wenlong(Beijing Advanced Connection Technology Research Center for Energy Engineering,Beijing Institute of Petrochemical Technology,Beijing,100926,China)

机构地区：[1]北京石油化工学院,北京市高等学校能源工程先进连接技术研究中心,北京100926

出　　处：《焊接学报》2024年第4期49-56,I0006,共9页Transactions of The China Welding Institution

基　　金：国家自然科学基金青年科学基金项目(51109005);北京市自然科学基金项目(3122016).

摘　　要：TIG熔覆是经济高效的表面修复方法,与传统的预置粉末法相比,同轴送粉法具有优良的适应性,但是试验研究相对较少.自主设计制造了环状同轴送粉TIG熔覆焊枪,与管状同轴送粉TIG熔覆焊枪相比,制造的熔覆层不存在熄弧位置凹坑、焊缝不够平直以及焊缝熔宽不一致等问题,而且具有更高的熔覆效率.结果表明,采用优化的焊接热输入、送粉量和SiC含量参数匹配,在316L不锈钢表面进行环状同轴送粉TIG熔覆,获得了外观优良的单层单道熔覆层、单层多道熔覆层.对熔覆层进行显微硬度测量、微观组织及元素成分分析、宏观电化学腐蚀试验、微区电化学腐蚀试验以及耐磨性能测试,并与母材进行了比对,环状同轴送粉TIG熔覆导入的SiC粉末有效地提升了熔覆层的耐蚀性与耐磨性.TIG cladding is an economical and efficient surface repair method.Compared with the traditional preset powder method,coaxial powder feeding method has excellent adaptability,but there are relatively few experimental studies.The annular coaxial powder-feeding TIG cladding torch was designed and manufactured independently.Compared with the tubular coaxial powder-feeding TIG cladding torch,the cladding layer manufactured has no defects such as arc extinguishing position pit,uneven weld seam and inconsistent weld seam width,and has higher cladding efficiency.By optimizing the parameters of welding line energy,powder feeding and SiC concentration,TIG cladding with annular coaxial powder feeding was carried out on the surface of 316L stainless steel,and single-layer single-pass cladding and single-layer multi-pass cladding with excellent appearance were obtained.The microhardness measurement,microstructure and element composition analysis,macro electrochemical corrosion test,micro electrochemical corrosion test and wear resistance test of the cladding layer were carried out,and compared with the base metal.The research shows that the SiC powder introduced by the annular coaxial powder feeding TIG effectively improves the corrosion resistance and wear resistance of the cladding layer.

关 键 词：环状同轴送粉TIG熔覆 316L不锈钢 掺杂SiC 耐蚀性 耐磨性 

分 类 号：TG444.74[金属学及工艺—焊接]