Author(s): WANG Jian-jun, WANG Yang, WU Tian-hai, LI Guo-ping, JIANG Zhou-hua, LIU Chun-ming, School of Materials Science and Engineering, Northeastern University, Shanxi Taigang Stainless Steel Co Ltd, School of Metallurgy, Northeastern University
Pages: 121-125
Year: 2016 Issue:  10
Journal: Transactions of Materials and Heat Treatment
Keyword:  2205 duplex stainless steel; submerged arc welding; heat input; Widmanstatten austenite; mechanical property;
Abstract: The hot-rolled 2205 duplex stainless steel( DSS) plate was welded by submerged arc welding using different heat inputs.Microstructure and tensile properties of the welded joints under various heat input conditions were carefully analyzed.The results are as follows: the microstructure of the weld metal presents the same feature,with approximate quadrilateral-blocky austenite and very little amount of parallel Widmanstatten austenite( WA) laths distributed in the ferrite matrix under the different heat inputs.The dimension of the blocky austenite increases with the increasing of the heat input.The formation of WA in the weld metal is suppressed under the relatively large heat input.The volume fraction of austenite in the weld metal and the width of HAZ increase with the increasing of the heat input.With the increasing of the heat input,the yield strength,tensile strength and elongation of the welded joints first increase to the maximum values and then decrease.The optimum tensile properties of the welded joints are obtained when the heat input is 16.48 kJ / cm under which the phase ratio of ferrite to austenite in the weld metal is close to 1∶ 1.