低合金高强钢表面不锈钢带极堆焊的研究  

Surfacing Welding Austenitic Stainless Steel on Surface of High-Strength Low-Alloy Steel by wide Strip Electrode

作　　者：宋天革[1] 

机构地区：[1]无锡职业技术学院机械技术学院,江苏无锡214121

出　　处：《热加工工艺》2012年第9期191-192,195,共3页Hot Working Technology

摘　　要：采用不锈钢带极双层堆焊,在低合金高强钢表面堆焊不锈钢耐蚀层。研究了过渡层、表面层带极成分对堆焊层的成分、组织及堆焊层δ铁素体含量的影响,并对堆焊试样进行横向侧弯和纵向侧弯测试。结果表明：过渡层采用309L、表面层采用347L宽50 mm带极,在焊接电流700~850 A、焊接速度140~160 mm/min条件下,可获得与低合金高强钢基体结合良好的堆焊层,堆焊层的增碳层无明显M脆化倾向,堆焊层组织为均匀的奥氏体＋δ铁素体双相组织,δ铁素体含量在4.5%~5.5%之间,奥氏体晶粒明显细化。High-strength low-alloy steel was welded by submerged arc welding（SAW） with wide stainless steel strip electrode.The microstructure,chemical composition and the amount of δ ferrite of weld metal were investigated,and the bending behavior was tested.Uniform,crack-free cladding layers with good adherence to the low-alloy steel substrates were observed in the weld metal using 50 mm wide 309L strip electrodes as transition layer and 347L as surface layer.Results show that the microstructure of weld metal is austenitic ＋δ ferrite,and the amount of δ ferrite is between 4.5%-5.5%.The austenitic in weld metal is fine and brittle M is not found in the fusion zones.

关 键 词：焊缝金属 过渡层 不锈钢带极 Δ铁素体 

分 类 号：TG455[金属学及工艺—焊接] TG142.71[一般工业技术—材料科学与工程]