金属热处理 ›› 2023, Vol. 48 ›› Issue (11): 16-21.DOI: 10.13251/j.issn.0254-6051.2023.11.003

• 材料研究 • 上一篇    下一篇

马氏体耐热钢40Cr10Si2Mo的动态连续冷却转变及相变动力学

王钦仁1, 王庆娟2, 赵肖飞1, 韩书栋1, 张伟1, 许荣1, 胡楠1   

  1. 1.酒钢宏兴股份有限公司, 甘肃 嘉峪关 735100;
    2.西安建筑科技大学 冶金工程学院, 陕西 西安 710055
  • 收稿日期:2023-06-04 修回日期:2023-09-20 出版日期:2023-11-25 发布日期:2023-12-27
  • 通讯作者: 王庆娟,教授,E-mail:jiandawqj@163.com
  • 作者简介:王钦仁(1987—),男,助理工程师,硕士,主要研究方向为钢铁材料组织性能控制及工艺,E-mail:wangqinren2022@163.com。

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

Wang Qinren1, Wang Qingjuan2, Zhao Xiaofei1, Han Shudong1, Zhang Wei1, Xu Rong1, Hu Nan1   

  1. 1. JISCO Hongxing Iron and Steel Co., Ltd., Jiayuguan Gansu 735100, China;
    2. School of Metallurgy and Engineering, Xi'an University of Architecture and Technology, Xi'an Shaanxi 710055, China
  • Received:2023-06-04 Revised:2023-09-20 Online:2023-11-25 Published:2023-12-27

摘要: 利用Gleeble-3500热模拟试验机研究了40Cr10Si2Mo钢在不同冷却速度下的连续冷却相变行为,建立了试验钢的动态连续冷却转变(CCT)曲线和连续冷却相变动力学模型,通过表征不同冷速下的微观组织,分析和讨论了不同冷速对相转变以及合金元素析出的影响。发现在冷速为0.1~0.3 ℃/s时,组织为铁素体基体上分布着大量碳化物颗粒。碳化物中Cr和Mo的含量随着冷却速度的升高而减少。冷速为0.5~0.8 ℃/s时,组织为铁素体+片层珠光体+少量马氏体+网状碳化物。当冷速大于3 ℃/s时,组织完全转变为马氏体。分别建立了扩散型Johnson-Mehl-Avrami(JMA)模型和非扩散型Koistinen-Marburger(K-M)相变模型,结果表明,试验值与模型拟合曲线吻合度良好。

关键词: 40Cr10Si2Mo马氏体耐热钢, 连续冷却, CCT曲线, 相变动力学

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

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