THE INFLUENCE OF SUB-TEMPERATURE QUENCHING TEMPERATURE ON THE MICROSTRUCTURE AND PROPERTIES OF 60Si2Mn STEEL
نویسندگان
چکیده
Article history: Received 29.05.2012. Received in revised form 27.07.2012 Accepted 03.09.2012. The influence of sub-temperature quenching temperature on the tensile strength, hardness and toughness of 60Si2Mn steel has been studied, and the ferrite content, austenite grain size and martensite morphology of the microstructure of this steel after sub-temperature quenching analyzed. The results show that duplex microstructure of martensite and ferrite has been obtained by sub-temperature quenching of 60Si2Mn steel. The ferrite content decreases when the quenching temperature increases. The strength and hardness of 60Si2Mn steel increase, however, its toughness decreases within the range of 770~800°C. The maximum strength and hardness can be obtained by quenching at 800°C, but the strength and hardness decrease above 800°C. The small amount of strip ferrite is distributed among martensite lamellar to improve steel toughness. The entire martensite structure can be obtained by quenching at 810°C.
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