THE INFLUENCE OF SUB-TEMPERATURE QUENCHING TEMPERATURE ON MICROSTRUCTURE AND PROPERTIES OF 60SI2MN STEEL

anming li, Mengjuan Hu

Abstract


Influence of sub-temperature quenching temperature on the tensile strength, hardness and toughness of 60Si2Mn steel was studied, and the ferrite content, austenite grain size and martensite morphology of the microstructure of this steel after sub-temperature quenching were analyzed. The results show that duplex microstructure of martensite and ferrite is obtained by sub-temperature quenching of 60Si2Mn steel. The ferrite content decreases with the quenching temperature increasing. The strength and hardness of 60Si2Mn steel increase, however, its toughness decreases in the range of 770~810℃. The maximum strength and hardness can be obtained by quenching at 800℃, but the strength and hardness decease above 800℃. The small amount of strip ferrite is distributed among martensite lamellar to improve the toughness of the steel. All martensite structure can be obtained by quenching at 810℃.

Keywords


60Si2Mn steel; sub-temperature quenching;tensile strength;hardness;microstructure

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ISSN 1330-9587 (Print), ISSN 1849-0433 (Online)

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