Proceedings of the KWS Conference (대한용접접합학회:학술대회논문집)
- 2002.10a
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- Pages.211-216
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- 2002
EVALUATION OF HYDROGEN INDUCED DISBONDING FOR CR-MO-V STEEL/AUSTENITIC STAINLESS OVERLAY
- Kim, Byung-Hoon (R & D Center, Doosan Heavy Industries and Construction Co., Ltd,) ;
- Kim, Dong-Jin (R & D Center, Doosan Heavy Industries and Construction Co., Ltd,) ;
- Kim, Jeong-Tae (R & D Center, Doosan Heavy Industries and Construction Co., Ltd,)
- Published : 2002.10.01
Abstract
To investigate transition region in welded overlay relating to disbonding crack, the effect of vanadium addition on disbonding of Cr-Mo steels overlay welded with austenitic stainless steel was studied. V modified Cr-Mo steels have a higher resistance to disbonding than V free Cr-Mo steel. One reason is due to the fact that fine vanadium carbide precipated in base metal traps hydrogen and thus decreases the susceptibility to the disbonding. The second is related to the higher stability of the vanadium and stable carbides formed during PWHT, in which the carbon diffusion to the interface is lower than for V free Cr-Mo steel. Decreasing the carbon content at the interface of the weld overlay shows good resistance to the disbonding. Hence, it is important to control the carbon content at the interface of the weld overlay.