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[Fang Naiwen,Wang Xingxing,Xu Kai,Long Weimin,Huang Ruisheng,Yang Yicheng,Ma Yiming and Xu Yinan.Effect of welding heatinput on microstructure and properties of MAG welded joint for Low nickel high nitrogen austenitic stainless steel[J].Rare Metal Materials and Engineering,2022,51(8):3089~3094.]
Effect of welding heatinput on microstructure and properties of MAG welded joint for Low nickel high nitrogen austenitic stainless steel
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Received:July 27, 2021  Revised:September 15, 2021
DOI:
Key words: N Content  low Nickel Nitrogen Austenitic stainless steel  laser arc hybrid welding  microstructure and mechanical properties
Foundation item:国防科技基础加强计划、黑龙江省省级资金资助项目(项目号GX18A007);黑龙江省头雁行动计划-能源装备先进焊接技术创新团队资助(项目号201916120)
Author NameAffiliation
Fang Naiwen,Wang Xingxing,Xu Kai,Long Weimin,Huang Ruisheng,Yang Yicheng,Ma Yiming and Xu Yinan  
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Abstract:
      The laser-MAG hybrid welding of 08Cr19Mn6Ni3Cu2N with low nickel and nitrogen content was carried out using 92% Ar+8% N2and 95% Ar+5% CO2 as shielding gas. The mechanism of the effect of shielding gas on the microstructure and properties of the welded joint was investigated. The results show that the average microhardness of the weld decreases with the addition of nitrogen, the welding spatter increases with the increase of arc volume and the decrease of arc stability, and the ferrite content in the weld decreases from 14.1% to 10.9% , the ferrite Dendrite also became finer and the secondary dendrite arm became shorter. There are only a few phases and two phases in the weld, and no phases and nitrides are found. The size of austenite grain decreases with the addition of nitrogen from four crystal planes.