Investigation of Transformation Plasticity of Tempered High Chromium Steel During Quenching

Abstract

The transformation induced plasticity (TRIP) phenomenon was first discovered in highly alloyed Cr, Ni and Mo steels. The microstructure of such steels contained significant amounts of retained austenite, which transformed to martensite during subsequent straining resulting in both high strength and toughness of steel. However, large addition of alloying elements make the steels more expensive and, hence, subsequent research efforts were directed at obtaining the TRIP effect in more cost effective compositions utilizing optimum termomechanical processing. Steel products, when hardened, deform and change its shape and measurements. On removal of deformation by flattening, special devices and technologies must be used, so expenditure of the labor increases. Steel after hardening is strength but brittle, however during transformation it is plastic for a short time, so at this moment it is a possibility to flatten curved products. Transformation plasticity of steel especially during tempering transformations investigated not so much that is why not so wide used in the practice.