Tensile Properties of Type 304 Stainless Steel in Temperature Range 77 to 1223 K and Strain Rate Range 10^-6 to 10^-1s^-1

Abstract

Strengths (true ultimate tensile strength, etc) and ductilities (uniform strain, etc) of Type 304 stainless steel have been presented for test temperatures 77 to 1223K and for strain rates 10^-6 to 10^-1 s^-1 in liquid (77 to 423K) and gas (air) (203 to 1223K) environments. The behaviours can be divided into two regions at a critical temperature of 400K, Tcr, where strain rate ε has little effect on the properties. Below Tcr, some martensite formation causes a prominient uniform strain peak when ε is low. The beneficial effect decreases with increasing ε and diminishes when ε=10^-1 s^-1. Uniform strain in liquid is higher when in gas for any ε. The reasons are explained. Above Tcr, the occurrence of two types of dynamic strain aging cause high values of strengths and uniform strain in the range 450K to 800-1000K.