Thermal-microstructural analysis of multipass welding of Cr/Mo steels
- Carleton Univ., Ottawa, Ontario (Canada)
- Metals Technology Lab., Ottawa, Ontario (Canada)
Full weave repair techniques for Cr/Mo steels without post-weld heat treatment are the subject of many research programs. Coupled thermal-microstructural analyses could preselect candidate welding parameters and reduce the cost and time required. In multipass welds, microstructural simulations require transient reaustenization, austenite decomposition for arbitrary thermal cycles including reheating and tempering. Finite element thermal analysis of a three-layer, weaved weld and the microstructural analysis of the heat-affected zone (HAZ) are described. Significant variation is found in properties governing reaustenization, austenite grain growth, austenite decomposition and hardness. Hardness measurements vary by up to {+-}30 HV on the same sample. Alloy differences within the allowable range lead to HAZ hardness variations of 30 HV in multipass welds. Predicted HAZ hardnesses of the three-layer weld were in good agreement with measurements. The final microstructure was also in good agreement with experiment. The predicted HAZ width was slightly wider than was measured. This difference is easily accounted for by the variation reported in weld parameters.
- Sponsoring Organization:
- Canada Centre for Mineral and Energy Technology, Ottawa, ON (Canada); Natural Sciences and Engineering Research Council of Canada, Ottawa, ON (Canada)
- OSTI ID:
- 442946
- Report Number(s):
- CONF-950682--; ISBN 0-87170-567-2
- Country of Publication:
- United States
- Language:
- English
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