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

材料科学技术（英文）, 2012, 28(3): 241-248.

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

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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

3.Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 56%0047, Japan

4.Technical Development Department, Welding Business, Kobe Steel Ltd., 100-1, Miyamae, Fujisawa, Kanagawa 251- 8551, Japan

5.Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 56%0047, Japan

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

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

Keywords： In situ observation Prior austenite grain size Low temperature toughness Intragranular nucleation Grain boundary nucleation ,

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.

参考文献

[1]	H. TERASAKI;Y. KOMIZO;M. YONEMUIRA .Time-Resolved In-Situ Analysis of Phase Evolution for the Directional Solidification of Carbon Steel Weld Metal[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2006(4):1261-1266.
[2]	S. OHKITA;Y. HORII .Recent development in controlling the microstructure and properties of low alloy steel weld metals[J].ISIJ International,1995(10):1170-1182.

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

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

参考文献