连续退火过程中的时效处理对冷轧低碳钢组织及性能的影响

doi:10.13251/j.issn.0254-6051.2025.04.035

金属热处理 ›› 2025, Vol. 50 ›› Issue (4): 231-236.DOI: 10.13251/j.issn.0254-6051.2025.04.035

连续退火过程中的时效处理对冷轧低碳钢组织及性能的影响

熊俊伟¹, 许立雄¹, 柳会梅¹, 孙昌政¹, 胡海江²

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:2024-09-18 修回日期:2025-01-09 发布日期:2025-06-13
作者简介:熊俊伟(1983—),男,高级工程师,硕士,主要研究方向为钢铁轧制及组织性能控制,E-mail:04109@wisdri.com

Effect of aging treatment during continuous annealing process on microstructure and properties of cold-rolled low carbon steel

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

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:2024-09-18 Revised:2025-01-09 Published:2025-06-13

摘要/Abstract

摘要： 采用某连续热镀锌/连续退火两用机组对两种冷轧低碳钢(0.076%C和0.140%C)进行在线连续退火处理,研究了快冷后的时效开始温度对其组织和性能的影响规律。结果表明,快冷后的时效开始温度在400~480 ℃时,随时效开始温度降低,两种钢的强度略微增加,伸长率变化也很小。此外,时效开始温度对铁素体形貌影响很小,但会改变第二相微观形貌。当时效开始温度为480 ℃时,预先析出的渗碳体保持原有的片层形貌;当时效开始温度为450和400 ℃时,渗碳体主要呈现球状或颗粒状形貌,分布在晶内和晶界,晶内渗碳体尺寸较小,一般在纳米级别,晶界处少量渗碳体析出尺寸相对较大。

关键词: 低碳钢, 连续退火, 组织, 性能, 析出

Abstract: On-line continuous annealing of two kinds of cold-rolled low carbon steel (0.076%C and 0.140%C, respectively) was carried out by using a continuous hot-dip galvanizing/continuous annealing dual-purpose unit, and the effect of aging starting temperature after rapid cooling on microstructure and properties of the steels was studied. The results show that when the aging starting temperature after rapid cooling decreases in the range of 400-480 ℃, the strength of the two steels increases slightly and the elongation changes a little. In addition, the aging starting temperature change has a little effect on the ferrite, but can change the morphology of the second phase. When the aging starting temperature is 480 ℃, the preformed precipitation of cementite maintains the original lamellar morphology. When the aging begins from 450 ℃ and 400 ℃, the cementite is mostly spherical or granular, distributed in the grain and at the grain boundary, the size of the cementite in the grain is small, generally at the nanoscale, and the precipitation size of a small amount of cementite at the grain boundary is relatively large.

Key words: low carbon steel, continuous annealing, microstructure, properties, precipitation

中图分类号:

TG142.1

熊俊伟, 许立雄, 柳会梅, 孙昌政, 胡海江. 连续退火过程中的时效处理对冷轧低碳钢组织及性能的影响[J]. 金属热处理, 2025, 50(4): 231-236.

Xiong Junwei, Xu Lixiong, Liu Huimei, Sun Changzheng, Hu Haijiang. Effect of aging treatment during continuous annealing process on microstructure and properties of cold-rolled low carbon steel[J]. Heat Treatment of Metals, 2025, 50(4): 231-236.

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连续退火过程中的时效处理对冷轧低碳钢组织及性能的影响

Effect of aging treatment during continuous annealing process on microstructure and properties of cold-rolled low carbon steel

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