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RESEARCH PAPERS

Representation of Elevated-Temperature Tensile Behavior of Type 304 Stainless Steel in a Sodium Environment

[+] Author and Article Information
O. K. Chopra, K. Natesan

Argonne National Laboratory, Materials Science Division, Argonne, Ill.

J. Eng. Mater. Technol 99(4), 366-371 (Oct 01, 1977) (6 pages) doi:10.1115/1.3443553 History: Received February 04, 1977; Revised April 18, 1977; Online August 17, 2010

Abstract

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.

Copyright © 1977 by ASME
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