Processing and Characterization of High Strength, High Ductility Hadfield Steel

摘要

Hadfield steel plastic flow behavior is known by strain hardening without neckingto high levels of strength and strain, and is described by upward curvature strain hardening with near-constant, near-linear strain hardening rates over large ranges of deformation temperature. This plastic flow behavior is valued for severe applications, but Hadfield steel yield stress is low. The purpose of this experimental study is to warm roll solution treated, iron 12.5 manganese-2.01molybdenum-1.15carbon Hadfield steel to high yield strength and to retain the valued characteristics of Hadfield steel plastic flow behavior. The objective of the study is to determine the effects of warm rolling on plastic flow behavior and microstructure of Hadfield steel. Experimental plastic flow behavior is evaluated in tension from both engineering and true stress-strain behavior. The purpose of the study is met by material thermomechanically processed to provide high yield stress, moderate rates of increasing load or strain hardening, high true uniform strain and ultra-high true uniform stress. The experimental stress-strain curves and microstructures suggest an influence of Hadfield steel deformation twins on plastic flow. Austenitic steels, Plastic flow, Yield strength, Stress-strain rate, Microstructure, Thermomechanical processing, Strain hardening, Deformation twins, Metallurgy, Mechanics. (JG)