节点构造中1Cr17Mn6Ni5N不锈钢等离子弧焊接接头的组织与性能
Microstructure and Properties of Welded Joint of 1Cr17Mn6Ni5N Stainless Steel by Plasma Arc Welding During Making Nodes
马 丽
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作者单位：（山西建筑职业技术学院，山西 太原 030006 ）
中文关键字：奥氏体不锈钢； δ-铁素体； 焊缝组织； ε-马氏体
英文关键字：austenitic stainless steel; δ-ferrite; weld microstructure; ε-martensite
中文摘要：利用等离子弧对节点构造中的1Cr17Mn6Ni5N含氮不锈钢进行焊接，采用金相显微镜、扫描电镜分析了其焊缝、热影响区的显微组织，用显微硬度计测试了接头的显微硬度。结果表明，采用等离子弧焊接方法对不锈钢焊接，可以获得均匀光滑无裂纹的焊缝；焊缝组织主要是奥氏体及沿柱状晶分布的δ-铁素体，奥氏体晶粒内部有ε-马氏体；在热影响区析出碳化物及在晶粒内部产生ε-马氏体相变，且靠近熔合线的母材的一些晶粒内部及热影响区中出现少量孪晶；母材、熔合区、焊缝金属区的显微硬度值分别为190、210、292 HV0.2。
英文摘要： During making nodes, after stainless steel was welded by plasma arc welding, the microstructure of weld seam and heat-affected tone was observed by scanning electron microscope(SEM), and the microhardness of the weld seam was tested by micro-sclerometer. The results indicate that uniform smooth weld seam without cracks can be got by plasma welding; the microstructure of weld seam mainly includes austenite and δ-ferrite which distribute along columnar crystals, there are ε-martensite inside austenitic crystals; the carbides precipitate in the heat-affected zone and there is ε-martensite transition inside crystals, a few bicrystals appear in some crystals near the base metal of the fusion line and the heat-affected zone; the microhardness of the base metal, the fusion zone, and weld metal zone is 190, 210, 292 HV0.2, respectively.