金属热处理 ›› 2025, Vol. 50 ›› Issue (9): 170-174.DOI: 10.13251/j.issn.0254-6051.2025.09.027

• 工艺研究 • 上一篇    下一篇

连续退火时效时间对低碳钢组织与性能的影响

柳会梅1, 陈珍妮2, 许立雄1, 熊俊伟1, 孙昌政1, 胡海江2   

  1. 1.中冶南方工程技术有限公司, 湖北 武汉 430223;
    2.武汉科技大学 耐火材料与冶金国家重点实验室, 湖北 武汉 430081
  • 收稿日期:2025-04-12 修回日期:2025-07-08 出版日期:2025-09-25 发布日期:2025-10-13
  • 通讯作者: 陈珍妮,硕士研究生,E-mail:2655715750@qq.com
  • 作者简介:柳会梅(1977—),女,高级工程师,主要研究方向为碳钢冷轧处理线,E-mail:04089@wisdri.com。
  • 基金资助:
    黄石创新发展联合基金(2024AFD009)

Effect of continuous annealing aging time on microstructure and mechanical properties of low carbon steels

Liu Huimei1, Chen Zhenni2, Xu Lixiong1, Xiong Junwei1, Sun Changzheng1, Hu Haijiang2   

  1. 1. WISDRI Engineering & Research Incorporation Limited, Wuhan Hubei 430223, China;
    2. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan Hubei 430081, China
  • Received:2025-04-12 Revised:2025-07-08 Online:2025-09-25 Published:2025-10-13

摘要: 通过对碳含量为0.06%和0.12%(质量分数)的两种冷轧低碳钢采用Gleeble-3500型热模拟试验机进行不同时效时间的连续退火处理热模拟试验,研究时效时间对冷轧低碳钢的最终组织和性能的影响规律,以优化某钢厂连续热镀锌连退两用机组的在线退火工艺参数。结果表明,随着时效时间的延长,钢的强度会有所降低,硬度会有略微降低,而断后伸长率变化相差很小甚至没有变化。时效过程碳化物会发生球化,由原有的片层状转变为球状或颗粒状,主要分布于晶界处,球化效果会随着时效时间的增加更为显著,且存在碳化物球化后的尺寸急剧增加的现象。本文结果可以为低碳钢冷轧带钢板的连续退火工艺设计提供依据。

关键词: 低碳钢, 连续退火, 组织, 力学性能, 碳化物

Abstract: Aiming to optimize the online annealing process parameters of a continuous hot-dip galvanizing and annealing dual-purpose production line at a certain steel plant, effect of aging time on the final microstructure and properties of cold-rolled low carbon steels with C contents (0.06% and 0.12%, mass fraction) was investigated through thermal-simulated continuous annealing experiments with Gleeble-3500 thermal simulation testing machine. The results show that with the extension of the aging time, the strength of the tested steels decreases to some extent, the hardness slightly decreases, and the elongation after fracture changes very little or remains unchanged. During the aging process, the carbides undergo spheroidization, transforming from the original flaky or lamellar form to spherical or granular form, mainly distributed at the grain boundaries. The spheroidization effect becomes remarkably more pronounced with increasing aging time, and there is a dramatic increase in the size of carbides after spheroidization. The present results is hoped to provide guidance for designing annealing processes of cold-rolled low carbon steel strips.

Key words: low carbon steel, continuous annealing, microstructure, mechanical properties, carbides

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