Representation of elevated-temperature tensile behavior of Type 304 stainless steel in a sodium environment. [(550 and 700/sup 0/C and strain rates of 3. 81 x 10/sup -6/ to 1. 90 x 10/sup -3/ s/sup -1/)]
An analysis of tensile behavior of Type 304 stainless steel was conducted for specimens in the solution-annealed condition and after exposure to a sodium environment. The Voce equation was used to describe tensile flow curves for plastic strains above 0.005 at temperatures between 550 and 700/sup 0/C and strain rates of 3.81 x 10/sup -6/ to 1.90 x 10/sup -3/ s/sup -1/. The results show that, when compared with solution-annealed specimens, the tensile flow behavior of the sodium-exposed specimens is characterized by a higher strain-hardening rate, which decreases rapidly with an increase in flow stress. The values of the saturation stress for uniform elongation predicted from the Voce model are higher for the sodium-exposed specimens than for those in the solution-annealed condition at strain rates < or approximately 5 x 10/sup -5/ s/sup -1/ and lower for strain rates > or approximately 5 x 10/sup -5/ s/sup -1/. Metallographic examination of the fracture surfaces shows a transition from a complete ductile fracture to a partial intergranular failure as the strain rate decreases. Carburization of the specimens appears to inhibit the intergranular failure.
- Research Organization:
- Argonne National Lab., IL
- OSTI ID:
- 6657385
- Journal Information:
- J. Eng. Mater. Technol.; (United States), Vol. 99:4
- Country of Publication:
- United States
- Language:
- English
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