Ductility dip cracking susceptibility of Inconel Filler Metal 52 and Inconel Alloy 690
- BWX Technologies, Inc. (United States)
- Westinghouse Electric Co., Schenectady, NY (United States)
Alloy 690 and Filler Metal 52 have become the materials of choice for commercial nuclear steam generator applications in recent years. Filler Metal 52 exhibits improved resistance to weld solidification and weld-metal liquation cracking as compared to other nickel-based filler metals. However, recently published work indicates that Filler Metal 52 is susceptible to ductility dip cracking (DDC) in highly restrained applications. Susceptibility to fusion zone DDC was evaluated using the transverse varestraint test method, while heat affected zone (HAZ) DDC susceptibility was evaluated using a newly developed spot-on-spot varestraint test method. Alloy 690 and Filler Metal 52 cracking susceptibility was compared to the DDC susceptibility of Alloy 600, Filler Metal 52, and Filler Metal 625. In addition, the effect of grain size and orientation on cracking susceptibility was also included in this study. Alloy 690, Filler Metal 82, Filler Metal 52, and Filler Metal 625 were found more susceptible to fusion zone DDC than Alloy 600. Filler Metal 52 and Alloy 690 were found more susceptible to HAZ DDC when compared to wrought Alloy 600, Filler Metal 82 and Filler Metal 625. Filler Metal 52 exhibited the greatest susceptibility to HAZ DDC of all the weld metals evaluated. The base materials were found much more resistant to HAZ DDC in the wrought condition than when autogenously welded. A smaller grain size was found to offer greater resistance to DDC. For weld metal where grain size is difficult to control, a change in grain orientation was found to improve resistance to DDC.
- Research Organization:
- Westinghouse Electric Co., Schenectady, NY (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 661678
- Report Number(s):
- MAO-T-98-0233; MER-98-2; CONF-980657-; ON: DE98006032; NC: NONE; TRN: 98:006971
- Resource Relation:
- Conference: 5. international conference on trends in welding research, Pine Mountain, GA (United States), 1-5 Jun 1998; Other Information: PBD: [1998]
- Country of Publication:
- United States
- Language:
- English
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