高C-Mo低Si型热作模具钢的热稳定性

doi:10.13251/j.issn.0254-6051.2025.09.004

金属热处理 ›› 2025, Vol. 50 ›› Issue (9): 19-26.DOI: 10.13251/j.issn.0254-6051.2025.09.004

高C-Mo低Si型热作模具钢的热稳定性

袁滔^1,2, 李绍宏^1,2, 李慧东^1,2, 李俊^1,2, 左鹏鹏³, 李萌蘖^1,2

1.昆明理工大学材料科学与工程学院, 云南昆明 650093;
2.云南省高端轻合金集成计算材料工程重点实验室, 云南昆明 650093;
3.江苏科技大学材料科学与工程学院, 江苏镇江 212000

收稿日期:2025-04-09 修回日期:2025-06-23 出版日期:2025-09-25 发布日期:2025-10-13
通讯作者: 李绍宏,副教授,博士, E-mail: uniquelsh@163.com
作者简介:袁滔(2000—),男,硕士,主要研究方向为金属材料热处理及组织调控,E-mail: 1132547220@qq.com。
基金资助:
国家自然科学基金(51761022)

Thermal stability of high-C-Mo and low Si hot work die steel

Yuan Tao^1,2, Li Shaohong^1,2, Li Huidong^1,2, Li Jun^1,2, Zuo Pengpeng³, Li Mengnie^1,2

1. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, China;
2. Yunnan Key Laboratory of Integrated Computational Materials Engineering for Advanced Light Metals, Kunming Yunnan 650093, China;
3. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang Jiangsu 212000, China

Received:2025-04-09 Revised:2025-06-23 Online:2025-09-25 Published:2025-10-13

摘要/Abstract

摘要： 研究了高C-Mo低Si型热作模具钢1060 ℃油淬后在580、620和660 ℃回火2~30 h过程中的热稳定性能。分析了试验钢经不同温度和时间回火后的显微组织与硬度的变化规律,并结合Johnson-Mehl-Avrami方程建立了试验钢的回火软化模型。结果表明,试验钢在580、620、660 ℃回火30 h后的硬度值相较于淬火态试样分别下降了16.4、26.4和33.6 HRC。试验钢的回火激活能为110.3 kJ/mol,其在580、620、660 ℃回火时的Avrami指数分别为0.275、0.304和0.190,该指数均在0.5以下表明试验钢的马氏体分解过程主要由体扩散控制,并且Avrami指数在高温时更低说明试验钢在较高温度时的热稳定性更强。

关键词: 热作模具钢, 热稳定性, 回火动力学, Johnson-Mehl-Avrami方程

Abstract: Thermal stability of a high-C-Mo and low-Si hot work die steel oil-quenched at 1060 ℃ during tempering at 580, 620 and 660 ℃ for 2-30 h was investigated. The microstructure and hardness variation characteristics of the tested steel after tempering at different temperatures for different time were analyzed, and the tempering softening model of the tested steel was established in combination with the Johnson-Mehl-Avrami equation. The results show that the hardness values of the tested steel tempered at 580, 620, and 660 ℃ for 30 h are decreased by 16.4, 26.4, and 33.6 HRC respectively compared to the as-quenched specimens. The activation energy for tempering of the tested steel is 110.3 kJ/mol. The Avrami indices tempered at 580, 620, and 660 ℃ are 0.275, 0.304, and 0.190, respectively. All these indices are below 0.5, indicating that the martensite decomposition process of the tested steel is mainly controlled by volume diffusion. Moreover, the Avrami index is lower at higher temperatures, suggesting that the tested steel has stronger thermal stability at higher temperatures.

Key words: hot work die steel, thermal stability, tempering kinetics, Johnson-Mehl-Avrami equation

中图分类号:

TG142.1

袁滔, 李绍宏, 李慧东, 李俊, 左鹏鹏, 李萌蘖. 高C-Mo低Si型热作模具钢的热稳定性[J]. 金属热处理, 2025, 50(9): 19-26.

Yuan Tao, Li Shaohong, Li Huidong, Li Jun, Zuo Pengpeng, Li Mengnie. Thermal stability of high-C-Mo and low Si hot work die steel[J]. Heat Treatment of Metals, 2025, 50(9): 19-26.

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高C-Mo低Si型热作模具钢的热稳定性

Thermal stability of high-C-Mo and low Si hot work die steel

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