Effect of quenching temperature on microstructure and properties of ZG25MnCrNiMo steel

doi:10.13251/j.issn.0254-6051.2020.06.009

Abstract

Abstract: Effect of quenching temperature on microstructure and properties of ZG25MnCrNiMo steel was studied by means of optical microscopy (OM), tensile test machine and impact test machine. The results show that the microstructure of quenched ZG25MnCrNiMo steel is lath martensite. In the temperature range from 840 ℃ to 930 ℃, with the increase of quenching temperature, the lath martensite in the microstructure gradually becomes finer and reaches the finest at 930 ℃. The tensile strength of the ZG25MnCrNiMo steel quenched at 840-930 ℃ and tempered at 600 ℃ first increases and then decreases, and the elongation and low temperature impact absorbed energy first decreases and then increases. The tensile strength of the steel quenched at 930 ℃is the highest, which is 992 MPa. The elongation and －40 ℃ low temperature impact absorbed energy of the steel quenched at 840 ℃ are the largest, which are 17.1% and 78 J, respectively.

Key words: ZG25MnCrNiMo steel, quenching temperature, microstructure, properties

CLC Number:

TG161

Peng Erbao, Chen Changduo. Effect of quenching temperature on microstructure and properties of ZG25MnCrNiMo steel[J]. Heat Treatment of Metals, 2020, 45(6): 43-45.

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