Developing optimum postweld treatments of IN625 welds using stress relaxation tests
Inconel 625 is a solid-solution strengthened, nickel-based, chromium molybdenum alloy used for its high strength and excellent corrosion resistance. Corrosion resistance and, to a lesser extent, strength can be enhanced by precipitation of intergranular carbides by appropriate heat treatment. In welded structures, dissolution of carbides near the fusion line in the heat-affected zone render denuded regions susceptible to preferential corrosive attack that is greatly aggravated by residual stresses. To reduce the propensity for stress corrosion in weldments, manufacturing practice typically includes methods for reducing residual stresses, usually using postweld heat treatments. With appropriate heat treatment, grain boundary carbides and general corrosion resistance can be restored at the same time. A series of heat treatments were performed between 1050 and 1800{degrees}F (566 and 982{degrees}C) to determine effectiveness in relieving welding-induced stresses as well as for improving corrosion resistance for a specialized application. Stress relaxation testing of all-weld-metal specimens was compared to residual stress measurement in full-scale weldments using a hole-drilling strain gage technique. The much simpler stress relaxation method provided an excellent measure of residual stresses and proved to be an expeditious way to develop optimum postweld heat treatments.
- OSTI ID:
- 115497
- Report Number(s):
- CONF-9404233-; TRN: 95:002927-0075
- Resource Relation:
- Conference: 75. American Welding Society (AWS) annual meeting, Philadelphia, PA (United States), 10-15 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of 75th Diamond anniversary American Welding Society annual meeting; PB: 273 p.
- Country of Publication:
- United States
- Language:
- English
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