高碳帘线钢的冷却相变行为

doi:10.13251/j.issn.0254-6051.2023.02.013

金属热处理 ›› 2023, Vol. 48 ›› Issue (2): 79-84.DOI: 10.13251/j.issn.0254-6051.2023.02.013

高碳帘线钢的冷却相变行为

褚峰, 沈奎, 胡显军, 张继明

江苏省(沙钢)钢铁研究院, 江苏张家港 215625

收稿日期:2022-09-08 修回日期:2022-12-15 出版日期:2023-02-25 发布日期:2023-03-22
通讯作者: 沈奎,高级工程师,硕士, E-mail: shenkui2004@163.com
作者简介:褚峰(1991—),男,工程师,学士,主要研究方向为钢铁组织性能检测及控制,E-mail: 69124732@qq.com。

Phase transformation behavior of high-carbon cord steel during cooling

Chu Feng, Shen Kui, Hu Xianjun, Zhang Jiming

Institute of Research of Iron & Steel, Shasteel, Zhangjiagang Jiangsu 215625, China

Received:2022-09-08 Revised:2022-12-15 Online:2023-02-25 Published:2023-03-22

摘要/Abstract

摘要： 利用热模拟机Gleeble-3800测定了高碳帘线钢的动态CCT和TTT曲线,研究了冷却速度和等温转变温度对组织性能的影响。结果表明,连续冷却时,形成晶界渗碳体的临界冷速为1.5 ℃/s,形成马氏体组织的临界冷速为11 ℃/s。等温转变时,珠光体转变的温度区间为600~700 ℃,当温度为625 ℃时,转变时间最短。等温温度升高,相变时间延长,等温温度降低则会形成贝氏体等异常组织。实际采用斯太尔摩控冷时,将吐丝温度控制为 900 ℃,开启前5台风机,风量分别为100%/100%/80%/50%/30%,保证相变冷速在5~7 ℃/s,且在相变前尽快通过网状碳化物形成的区间,可以得到组织性能满足技术要求的高强帘线钢。

关键词: 帘线钢, 连续冷却, 等温转变, 显微组织

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

中图分类号:

TG142.1

褚峰, 沈奎, 胡显军, 张继明. 高碳帘线钢的冷却相变行为[J]. 金属热处理, 2023, 48(2): 79-84.

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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高碳帘线钢的冷却相变行为

Phase transformation behavior of high-carbon cord steel during cooling

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