Effect of reversed austenite on work-hardening behavior in a low carbon 13 percent chromium martensitic stainless steel

摘要

Low carbon 13Cr martensitic (alpha') stainless steel has been applied to structural materials for line-pipe because this material has sufficient resistance to carbon dioxide corrosion and sulfide stress corrosion cracking (SSC) in light sour environment, as well as excellent mechanical properties and weldability. It is well known that fine austenite grains (reversed gamma) are formed in the microstructure when this material is subjected to tempering treatment, and the reversed gamma influences on the mechanical properties and corrosion resistance. In particular, the deformation behavior is significantly dependent on the amount and dispersion of the reversed gamma because it partially transforms to hard alpha' structure during plastic deformation. Since this material is transported after reeling up round the large-size rotating drum in some cases, it is important to understand the work-hardening behavior and the mechanical properties after plastic deformation. In this study, microstructure and tensile properties are investigated, and then the effect of reversed gamma on work-hardening behavior is discussed in a low carbon 13Cr alpha' stainless steel.