Tensile-property characterization of thermally aged cast stainless steels

Abstract

The effect of thermal aging on tensile properties of cast stainless steels during service in light water reactors has been evaluated. Tensile data for several experimental and commercial heats of cast stainless steels are presented. Thermal aging increases the tensile strength of these steels. The high-C Mo-bearing CF-8M steels are more susceptible to thermal aging than the Mo-free CF-3 or CF-8 steels. A procedure and correlations are presented for predicting the change in tensile flow and yield stresses and engineering stress-vs.-strain curve of cast stainless steel as a function of time and temperature of service. The tensile properties of aged cast stainless steel are estimated from known material information, i.e., chemical composition and the initial tensile strength of the steel. The correlations described in this report may be used for assessing thermal embrittlement of cast stainless steel components.iii * When impact energy is expressed in J/cm 2, first multiply by 0.8 to obtain impact energy of a standard Charpy-V notch specimen in J.

A microstructure-based three-scale homogenization model for predicting the elasto-viscoplastic behavior of duplex stainless steels

“…The resulting tensile curves are shown in Figure 2. Thermal aging induces a small increase of the yield stress, an increase of the ultimate tensile stress and a decrease of the elongation at fracture, consistent with previous studies (Bugat, 2000;Michaud et al;.…”