Microstructure and Corrosion Resistance of Arc Additive Manufactured 316L Stainless Steel
来源期刊:Journal Of Wuhan University Of Technology Materials Science Edition2020年第5期
论文作者:杨可 WANG Qiuyu QU Yang JIANG Yongfeng BAO Yefeng
文章页码:930 - 936
摘 要:The gas tungsten arc welding based additive manufacturing (GTAW-AM) was carried out by printing 316L austenitic stainless steel on carbon steel substrate with different arc currents (140,160,180 A).Microstructure and corrosion resistance of additive manufactured components were investigated.The results show that the microstructure of the GTAW-AM austenitic stainless steel is obviously changed by the arc current.With arc current increasing from 140 to 180 A,the austenite grains become coarse due to the effect of welding heat input.Meanwhile,the quantity of ferrites in the austenite matrix is decreased and the morphology transforms from lath to skeleton.Moreover,σ phases are finally formed under the arc currents of 180 A owing to high welding heat input.Therefore,as the microstructure transform into coarse-grained austenites,low-quantity ferrites and new-generated σ phases,the GTAW-AM austenitic stainless steel presents a significantly decrease in corrosion resistance.And the reduction of corrosion resistance is mainly due to the formation of σ phase as a result from consuming the large amounts of Cr element from the matrix.
杨可1,2,WANG Qiuyu1,2,QU Yang1,2,JIANG Yongfeng1,2,BAO Yefeng1,2
1. College of Mechanical and Electrical Engineering, Hohai University2. Nantong Ocean and Coastal Engineering Research Institute, Hohai University
摘 要:The gas tungsten arc welding based additive manufacturing (GTAW-AM) was carried out by printing 316L austenitic stainless steel on carbon steel substrate with different arc currents (140,160,180 A).Microstructure and corrosion resistance of additive manufactured components were investigated.The results show that the microstructure of the GTAW-AM austenitic stainless steel is obviously changed by the arc current.With arc current increasing from 140 to 180 A,the austenite grains become coarse due to the effect of welding heat input.Meanwhile,the quantity of ferrites in the austenite matrix is decreased and the morphology transforms from lath to skeleton.Moreover,σ phases are finally formed under the arc currents of 180 A owing to high welding heat input.Therefore,as the microstructure transform into coarse-grained austenites,low-quantity ferrites and new-generated σ phases,the GTAW-AM austenitic stainless steel presents a significantly decrease in corrosion resistance.And the reduction of corrosion resistance is mainly due to the formation of σ phase as a result from consuming the large amounts of Cr element from the matrix.
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