控冷速度对15CrMo锅炉钢组织与硬度的影响

doi:10.13251/j.issn.0254-6051.2025.10.028

金属热处理 ›› 2025, Vol. 50 ›› Issue (10): 179-184.DOI: 10.13251/j.issn.0254-6051.2025.10.028

控冷速度对15CrMo锅炉钢组织与硬度的影响

端可, 张俊凯, 张大征, 李维娟, 庞启航

辽宁科技大学材料与冶金学院, 辽宁鞍山 114051

收稿日期:2025-04-18 修回日期:2025-08-05 出版日期:2025-10-25 发布日期:2025-11-04
通讯作者: 庞启航,副教授,博士,E-mail: qihang25@163.com
作者简介:端可(2005—),女,主要研究方向为高性能金属材料组织性能调控,E-mail: 3191383970@qq.com。
基金资助:
国家自然科学基金(52004122);辽宁省教育厅高校基本科研项目-科技创新团队项目(LJ222410146010);辽宁科技大学大学生创新创业训练项目(2025年)

Effect of controlled cooling rate on microstructure and hardness of 15CrMo boiler steel

Duan Ke, Zhang Junkai, Zhang Dazheng, Li Weijuan, Pang Qihang

School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan Liaoning 114051, China

Received:2025-04-18 Revised:2025-08-05 Online:2025-10-25 Published:2025-11-04

摘要/Abstract

摘要： 采用金相显微镜、扫描电镜及其能谱仪、显微硬度计对15CrMo锅炉钢在Gleeble-3500热模拟试验机上奥氏体化后以不同冷却速度控冷+回火后的组织和硬度进行研究,并与实验室正火+回火后的组织和硬度进行对比分析。结果表明,正火+回火后的显微组织主要由铁素体和贝氏体构成,热模拟控冷+回火后的组织随着冷却速度的升高,铁素体晶粒细化且体积分数减少,贝氏体含量增加且贝氏体中碳化物形态由棒状回溶成颗粒状。不同冷速热模拟控冷+回火后的硬度均高于正火+回火后的硬度,且随着控冷速度的升高,显微硬度呈现逐渐升高的变化趋势,当冷速为10 ℃/s时,组织均匀细小且显微硬度达到最高。

关键词: 15CrMo锅炉钢, 控制冷却, 组织, 硬度

Abstract: Microstructure and hardness of 15CrMo boiler steel subjected to controlled cooling at various rates following austenitizing and subsequent tempering on a Gleeble-3500 thermal simulator were investigated using optical microscope (OM), scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS), and microhardness testing, which were compared with those obtained from laboratory-normalized + tempered specimen. The results show that the normalized + tempered microstructure primarily consists of ferrite and bainite. For the simulated controlled-cooled and tempered specimen, as the cooling rate increases, the ferrite grains become refined and their volume fraction decreases, while the bainite content increases. Furthermore, the morphologies of carbides within the bainite transform from rod-shaped to granular particles. Microhardness of the specimen subjected to simulated controlled cooling at different rates followed by tempering is consistently higher than that of normalized + tempered specimen, exhibiting a gradual increasing trend with higher controlled cooling rates. At cooling rate of 10 ℃/s, the microstructure is uniform and refined, and the microhardness reaches the peak.

Key words: 15CrMo boiler steel, controlled cooling, microstructure, hardness

中图分类号:

TG156

端可, 张俊凯, 张大征, 李维娟, 庞启航. 控冷速度对15CrMo锅炉钢组织与硬度的影响[J]. 金属热处理, 2025, 50(10): 179-184.

Duan Ke, Zhang Junkai, Zhang Dazheng, Li Weijuan, Pang Qihang. Effect of controlled cooling rate on microstructure and hardness of 15CrMo boiler steel[J]. Heat Treatment of Metals, 2025, 50(10): 179-184.

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控冷速度对15CrMo锅炉钢组织与硬度的影响

Effect of controlled cooling rate on microstructure and hardness of 15CrMo boiler steel

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