Microstructure and Mechanical Properties of a Dissimilar Friction Stir Weld between Austenitic Stainless Steel and Low Carbon Steel  

作　　者：M Jafarzadegan A.Abdollah-zadeh A.H.Feng T.Saeid J.Shen H.Assadi 

机构地区：[1]Department of Materials Eng.,Tarbiat Modares University,P.O.Box 14115-143,Tehran,Iran [2]School of Materials Science and Eng.,Harbin Institute of Technology,P.O.Box 150001,Harbin,China [3]Advanced Materials Research Center,Sahand University of Technology,P.O.Box 51335-1996,Tabriz,Iran

出　　处：《Journal of Materials Science & Technology》2013年第4期367-372,共6页材料科学技术（英文版）

基　　金：the support from Harbin Institute of Technology(HIT) for the experimental assistance

摘　　要：Dissimilar fusion welding of austenitic stainless steels to carbon steels has some metallurgical and technical problems. It was suggested that the solid-state nature of friction stir welding （FSW） can overcome these problems and produce a sound weld with reliable mechanical properties. In this study, plates of 304 stainless steel and st37 steel were welded together by FSW at tool rotational speed of 600 r/rain and welding speed of 50 ram/rain. In the stir zone （SZ） of 304 stainless steel, the results showed a refined grain structure with some features of metadynamic recrystallization. In the SZ of st37 steel, the hot deformation of material in the austenite region produced small austenite grains. These grains transformed to fine ferrite and pearlite by cooling the material after FSW. The production of fine grains increased the hardness and tensile strength in the SZ of both sides with respect to their base metals （BMs）.Dissimilar fusion welding of austenitic stainless steels to carbon steels has some metallurgical and technical problems. It was suggested that the solid-state nature of friction stir welding （FSW） can overcome these problems and produce a sound weld with reliable mechanical properties. In this study, plates of 304 stainless steel and st37 steel were welded together by FSW at tool rotational speed of 600 r/rain and welding speed of 50 ram/rain. In the stir zone （SZ） of 304 stainless steel, the results showed a refined grain structure with some features of metadynamic recrystallization. In the SZ of st37 steel, the hot deformation of material in the austenite region produced small austenite grains. These grains transformed to fine ferrite and pearlite by cooling the material after FSW. The production of fine grains increased the hardness and tensile strength in the SZ of both sides with respect to their base metals （BMs）.

关 键 词：Friction stir welding Microstructure Mechanical properties Stainless steel Low carbon steel 

分 类 号：TG457.11[金属学及工艺—焊接]