Serrated yielding in austenitic stainless steels

Abstract

ABSTRACT Austenitic stainless steels are widely employed in various applications due to many desirable properties such as excellent mechanical properties and corrosion/oxidation resistance. Serrated yielding phenomenon that occurs in austenitic stainless steels during deformation can cause significant changes in microstructures and mechanical properties. Thus, understanding the serrated yielding mechanisms and their influence on the mechanical behaviour on austenitic stainless steels is essential for developing and designing an advanced steel for harsher environment applications. In this article, a concise review of serrated yielding behaviour is examined and discussed with special attention to serration types, models describing the origin of the serrated flow, temperature-strain rate regimes for the serration occurrence, recent findings of the serration behaviour in a variety of austenitic steels and the role of dynamic strain ageing. Contradiction about the negative/beneficial impact of serrated flow on mechanical properties of newly developed austenitic stainless steels also is presented.