Dynamic continuous cooling transformation behavior and transformation kinetics of 40Cr10Si2Mo martensitic heat-resistant steel

doi:10.13251/j.issn.0254-6051.2023.11.003

Abstract

Abstract: Phase transformation behavior of a 40Cr10Si2Mo steel during continuous cooling at different cooling rates was investigated by Gleeble-3500 thermal simulator. The dynamic continuous cooling transformation (CCT) curves and the phase transformation kinetics models of the steel were established. The effects of different cooling rates on phase transformation and alloying element precipitation were analyzed and discussed by characterizing the microstructure at different cooling rates. It is observed that the microstructure consists of ferrite and carbides at cooling rate of 0.1-0.3 ℃/s. Subsequently the precipitation of Cr and Mo in carbides decreases with the increase of cooling rate. The microstructure is ferrite and lamellar pearlite and a small amount of martensite and network carbides at cooling rate of 0.5-0.8 ℃/s. When the cooling rate is greater than 3 ℃/s, the resulted microstructure is full lath martensite. According to the established models of both the Johnson-Mehl-Avrami(JMA) diffusive type and the Koistinen-Marburger (K-M) non-diffusive type, the phase transformation kinetics curves fit well with the experimental data.

Key words: 40Cr10Si2Mo martensitic heat-resistant steel, continuous cooling, CCT curves, phase transformation kinetics

CLC Number:

TG142.1⁺4

Wang Qinren, Wang Qingjuan, Zhao Xiaofei, Han Shudong, Zhang Wei, Xu Rong, Hu Nan. Dynamic continuous cooling transformation behavior and transformation kinetics of 40Cr10Si2Mo martensitic heat-resistant steel[J]. Heat Treatment of Metals, 2023, 48(11): 16-21.

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