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°C and strain rates of 3.81 × 10−6 to 1.90 × 10−3 s−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 ≲5 × 10−5 s−1 and lower for strain rates ≳5 × 10−5 s−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.
Representation of Elevated-Temperature Tensile Behavior of Type 304 Stainless Steel in a Sodium Environment
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Chopra, O. K., and Natesan, K. (October 1, 1977). "Representation of Elevated-Temperature Tensile Behavior of Type 304 Stainless Steel in a Sodium Environment." ASME. J. Eng. Mater. Technol. October 1977; 99(4): 366–371. https://doi.org/10.1115/1.3443553
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