Dramatic Increase of Strength and Ductility in Fe–22Mn–1.0C Twinning‐Induced Plasticity Steel at Elevated Temperature

Abstract

Tensile properties and microstructural evolutions of Fe-22Mn-1.0C (wt%) twinning-induced plasticity steel are investigated in the temperature range from 293 to 443 K. An unexpected enhancement of strength and ductility is observed at the elevated temperature of 443 K (%400 MPa ultimate tensile strength and %10% true strain improvements). The twinning capability is still kept stable with the increasing temperature, and the premature fracture is postponed by suppressing dynamic strain aging effect. As a result, the synchronous improvement of strength and plasticity is achieved at high deformation temperature.