Abstract
Numerical Model for Predicting Charpy Impact Toughness of Weld Heat-Affected Zone of Steels
Highlights
Prediction of toughness of weld heat-affected zone (HAZ) of steels is a difficult task because it is controlled by many parameters including grain-size, brittle microphase, hardness, etc
The model comprises two parts: phase transformation and toughness prediction. In the former part, phase fraction, size distribution of martensite-austenite brittle microphase, hardness, size of grain boundary ferrite and bainitic ferrite plate, etc. are calculated and these parameters are used in the latter part, in which probability of cleavage fracture initiation at each deformation stage of Charpy impact specimen is calculated assuming local fracture criterion and weakest-link mechanism
Distribution of stress and strain near notch-tip is calculated by dynamic elastic-plastic finite-element analysis, taking ductile crack extension in Charpy impact test into account
Summary
Numerical Model for Predicting Charpy Impact Toughness of Weld Heat-Affected Zone of Steels Kobe Steel Ltd., Kobe, Hyogo, 651-2271, Japan. The University of Tokyo, Bunkyo, Tokyo, 113-6556, Japan.
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