摘要
使用H0Cr20Ni14Mo3焊丝对2.5 mm厚的1Cr18Mn8Ni5N奥氏体不锈钢板进行TIG对接焊试验,通过调整垫板获得不同的焊缝组织,研究了1Cr18Mn8Ni5N不锈钢TIG焊缝的组织、力学性能及在3.5%Na Cl溶液的耐点蚀能力。结果表明：无垫板时,焊缝组织为奥氏体和δ铁素体,焊缝具有较高的强度和塑性,但其耐点蚀能力较差,腐蚀后焊缝中存在细小的点蚀坑和不均匀分布的直径为250-300μm的深点蚀坑。采用铜垫板时,焊缝组织为单一奥氏体,焊缝的强度、塑性与无垫板的焊缝相比较低,但具有更高的硬度和抗点蚀能力,腐蚀后焊缝中均匀分布着密集、细小的点蚀坑。
TIG butt welding tests of 2.5 mm thick 1 Cr18 Mn8 Ni5 N austenitic stainless steel plate were carried out by using H0 Cr20 Ni14 Mo3 welding wire, and the welds with different microstructure were obtained by adjusting back plate. The microstructure, mechanical properties and pitting corrosion resistance in 3.5% Na Cl solution of 1 Cr18 Mn8 Ni5 N stainless steel TIG welds were investigated. The results show that when there is no back plate, the microstructure of the weld consists of austenite and δ ferrite, the weld has high strength and plasticity, while the pitting corrosion is poor, small pits and uneven distributed deep pits with diameter of 250-300 μm exist in the weld after corrosion. When the copper back plate is used, the microstructure of the weld is single austenite, and the strength, plasticity of the weld are lower compared with that of the weld without back plate, while it has higher hardness and pitting corrosion resistance, and dense and small pitting pits are evenly distributed in the weld after corrosion.
作者
刘忠运
张兴乐
LIU Zhongyun1, ZHANG Xingle2(1. Chongqing Energy College, Chongqing 402260, China; 2. Chongqing Eastern Petroleum Marketing Co., Ltd., Chongqing 401120, Chin)
出处
《热加工工艺》
CSCD
北大核心
2018年第3期252-254,共3页
Hot Working Technology
基金
重庆市高等职业院校产教融合转型发展项目(20161208)
关键词
奥氏体不锈钢
Δ铁素体
力学性能
点蚀
austenitic stainless steel
ferrite
mechanical properties
pitting
