Microstructural Characterization of Welded Joint in Duplex Stainless Steel by Laser Continuous Heat Treatment  

作　　者：He-ping LIU Bin LIU Da-zhao LI Hu-er SUN Feng-er SUN Xue-jun JIN 

机构地区：[1]School of Materials Science and Engineering,North University of China [2]School of Materials Science and Engineering,Shanghai Jiao Tong University

出　　处：《Journal of Iron and Steel Research International》2014年第7期710-714,共5页

基　　金：Item Sponsored by National Natural Science Foundation of China(51201154,51174251);Natural Science Foundation of Shanxi Province of China(2013011014-1);School Foundation of North University of China(2013051)

摘　　要：Microstructural characterization in fusion zone of the laser continuous heat treatment welded joint was in vestigated. The results showed that the martensite-like microstructure is the face centered cubic （FCC） crystal structure so that it can be identified as the secondary austenite. The dislocation is observed inside and outside the seconda ry austenite, whereas inclusion is not found in the vicinity of the secondary austenite. In the fusion zone, there is a kind of carbide precipitate which is identified as M23 C6 by the means of transmission electron microscope （TEM）. The carbide precipitate is a representative mode of transformation, which can be generated by the eutectoid reaction. Furthermore, the formation mechanisms of the secondary austenite and chromium carbide are analyzed.Microstructural characterization in fusion zone of the laser continuous heat treatment welded joint was in vestigated. The results showed that the martensite-like microstructure is the face centered cubic （FCC） crystal structure so that it can be identified as the secondary austenite. The dislocation is observed inside and outside the seconda ry austenite, whereas inclusion is not found in the vicinity of the secondary austenite. In the fusion zone, there is a kind of carbide precipitate which is identified as M23 C6 by the means of transmission electron microscope （TEM）. The carbide precipitate is a representative mode of transformation, which can be generated by the eutectoid reaction. Furthermore, the formation mechanisms of the secondary austenite and chromium carbide are analyzed.

关 键 词：fusion zone continuous heat treatment characterization secondary austenite CARBIDE 

分 类 号：TG457.11[金属学及工艺—焊接] TG156.99