Effect of Minor Compressive Deformation in Austenite on Martensitic Transformation in Modified 9-12Cr Ferritic Steel

摘要

A modified high Cr ferritic heat-resistant steel was developed and subjected to the thermo mechanical treatment. The effect of applied stress and temperature on martensitic transformation and microstructure was studied by using high-resolution differential dilatometer and optical microscope. Applied stress raises the amount of defection as dislocation and grain boundary defects, thus elevate M_s. Applied stress also lead to the increase of transformation time due to the mechanical stabilization of austenite. Increase of applied stress or temperature would enhance these above effects.