Modifying microstructure and property of 30CrMnSi steel by subcritical austenite reverse transformation quenching
Keywords:austenite inverse phase, transformation, subcritical quenching, tensile strength, hardness, microstructure
AbstractSubcritical austenite reverse transformation quenching was used to improve the mechanical properties of 30CrMnSi steel, and the microstructure and mechanical properties of the samples were analyzed by subcritical austenite reverse transformation quenching. Experimental results show that subcritical reverse transformation quenching can refine the austenite grains of the 30CrMnSi steel. Lath-shaped martensite can be obtained after quenching. Ferrite is exited in the martensite lath when quenching temperature is low. When quenching temperature is higher than 840?, ferrite disappears and only lath-shaped martensite can be observed. The subcritical austenite reverse transformation quenching at 840? can effectively improve the strength and hardness, which is higher than that of the sample by conventional quenching at 870 ?.
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