Effect of Quenching Processes on Microstructure and Mechamcal Properties of a High Strength Steel

摘要

Microstructure and mechanical properties of a high strength low alloy steel with different quenching processes were researched.The results indicated that the prior austenite grains exhibit equiaxed shape in both high temperature rolling direct quenching and tempering steel (refer to as HR-DQ-T steel) and reheat quenching and tempering steel (RQ-T steel),while elongated and severe deformation band in controlled rolling direct quenching and tempering steel (CR-DQ-T steel).Transmission electron microscope of CR-DQ-T steel indicated narrowed refined lath martensite than the other two steels.The tensile strength and yield strength of RQ-T steel was lower than that of two direct quenching steels.The CR-DQ-T steel has excellent strength-toughness matching among three steels.