Analytical Investigation of Prior Austenite Grain Size Dependence of Low Temperature Toughness in Steel Weld Metal

查看全文 作　　者：X.F. [1]Zhang;P. [2]Hall;H. [1]Terasak;M. [2]Sato;Y. [1]Komizo

机构地区：[1]Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 56%0047, Japan;[2]Technical Development Department, Welding Business, Kobe Steel Ltd., 100-1, Miyamae, Fujisawa, Kanagawa 251- 8551, Japan

出　　处：《Journal of Materials Science & Technology》索引2012年第28卷第3期,共8页

摘　　要：Prior austenite grain size dependence of the low temperature impact toughness has been addressed in the bainitic weld metals by in situ observations.Usually,decreasing the grain size is the only approach by which both the strength and the toughness of a steel are increased.However,low carbon bainitic steel with small grain size shows a weakening of the low temperature impact toughness in this study.By direct tracking of the morphological evolution during phase transformation,it is found that large austenite grain size dominates the nucleation of intragranular acicular ferrite,whereas small austenite grain size leads to grain boundary nucleation of bainite.This kinetics information will contribute to meet the increasing low temperature toughness requirement of weld metals for the storage tanks and offshore structures. 关键词：奥氏体晶粒尺寸低碳贝氏体钢低温韧性焊缝金属低温冲击韧性针状铁素体原位观测形态演变

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Analytical Investigation of Prior Austenite Grain Size Dependence of Low Temperature Toughness in Steel Weld Metal

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