Phase transformation behavior of high-carbon cord steel during cooling

doi:10.13251/j.issn.0254-6051.2023.02.013

Abstract

Abstract: CCT curves and TTT curves of a high-carbon cord steel were investigated by using the Gleeble-3800 thermal simulator, and the effects of cooling rate and isothermal transformation temperature on microstructure and properties were studied. The results show that during the continuous cooling process, the critical cooling rates for the formation of grain boundary cementite and martensite are 1.5 ℃/s and 11 ℃/s, respectively. For the isothermal transformation, the temperature range of pearlitic transformation is 600-700 ℃, the transformation time is the shortest at 625 ℃. The higher the isothermal temperature, the longer the phase transformation time, but when the isothermal temperature decreases, the abnormal structure bainite forms. By actually using the Stelmor controlled cooling technique, controlling the spinning temperature at 900 ℃, and starting the first five fans with air volume being 100%/100%/80%/50%/30% respectively, so that the phase transformation cooling rate is controlled as 5-7 ℃/s and the network carbide forming interval can be passed through as soon as possible before the phase transformation, then the high-strength cord steel with microstructure and properties meeting the technical requirements can be produced.

Key words: cord steel, continuous cooling, isothermal transformation, microstructure

CLC Number:

TG142.1

Chu Feng, Shen Kui, Hu Xianjun, Zhang Jiming. Phase transformation behavior of high-carbon cord steel during cooling[J]. Heat Treatment of Metals, 2023, 48(2): 79-84.

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