THE INFLUENCE OF ORIGINAL STRUCTURES ON THE MICROSTRUCTURE AND PROPERTIES OF 27SiMn STEEL AFTER ZERO TIME HOLDING QUENCHING
نویسنده
چکیده
Article history: Received 10.9.2012 Received in revised form 10.12.2012 Accepted 10.12.2012 27SiMn steels with different original structures were zero time holding quenched after pretreatments including general quenching and normalizing, respectively, then their tensile strength and hardness were determined and also microstructures were analyzed.. The experimental results show that thus quenched 27SiMn steel by zero time holding quenching obtains a fine lath martensite structure and higher tensile strength and hardness. The mechanical properties of the thus quenched 27SiMn steel are better than that of the thus normalized 27SiMn steel. The effect of original structure on the mechanical properties of 27SiMn steel is prominent when the zero time holding quenching temperature is lower, but it decreases with an increase of the quenching temperature. The austenite inverse transformation zero time holding quenching at low temperature can improve the mechanical properties of 27SiMn steel. The mechanical properties of 27SiMn steel can be improved by austenite inverse transformation during zero time holding quenching at lower temperature.
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