控轧控冷工艺对ULCB钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2025.09.022

金属热处理 ›› 2025, Vol. 50 ›› Issue (9): 146-150.DOI: 10.13251/j.issn.0254-6051.2025.09.022

控轧控冷工艺对ULCB钢组织与性能的影响

王天琪, 柴希阳, 罗小兵, 师仲然

钢铁研究总院有限公司工程用钢研究院,北京 100081

收稿日期:2025-04-17 修回日期:2025-07-23 出版日期:2025-09-25 发布日期:2025-10-13
作者简介:王天琪(1993—),女,工程师,硕士,主要研究方向为船舶与海工用钢,E-mail: wtq0719@163.com。
基金资助:
钢铁研究总院有限公司自主投入基金(事23G60350Z)

Effect of controlled rolling and controlled cooling process on microstructure and properties of ULCB steel

Wang Tianqi, Chai Xiyang, Luo Xiaobing, Shi Zhongran

Research Institute of Engineering Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China

Received:2025-04-17 Revised:2025-07-23 Online:2025-09-25 Published:2025-10-13

摘要/Abstract

摘要： 通过CCT曲线和实验室控轧控冷工艺试验,研究了一种超低碳贝氏体(ULCB)钢连续冷却过程的相变特性以及组织性能。结果表明,ULCB试验钢在较宽的冷速范围内(0.03~44 ℃/s)不发生铁素体转变,只得到贝氏体组织,且硬度值约为270 HV5,波动较小。ULCB钢的组织与性能受终轧温度的影响较小,在不同的终轧温度下(750~900 ℃),ULCB钢的组织形态一致,均为粒状贝氏体,性能波动较小,但受终轧冷却速度影响较大,终轧缓冷(0.2~2.3 ℃/s)后组织为粒状贝氏体,终轧加速冷却(13.8 ℃/s)后组织为板条贝氏体,且ULCB钢的强度得到明显提升,但韧性下降。综合分析,ULCB试验钢可在较宽的工艺窗口内获得组织均一、性能稳定的贝氏体组织,工艺适应性较好。

关键词: ULCB钢, CCT曲线, 控轧控冷, 微观组织, 性能

Abstract: Transformation characteristics and microstructure-property of an ultra-low carbon bainitic (ULCB) steel during continuous cooling were studied through CCT curves and laboratory-scale controlled rolling and cooling process tests. The results show that the tested ULCB steel does not undergo ferrite transformation within a wide range of cooling rates (0.03-44 ℃/s), and only obtains bainite structure, with a small fluctuation in hardness value which is about 270 HV5. The microstructure and properties of the ULCB steel are less affected by the finish-rolling temperature. At different finish-rolling temperatures (750-900 ℃), the microstructure of the ULCB steel is consistent, all being granular bainite, and the properties fluctuation are small. However, it is greatly affected by the finish-rolling cooling rate. After slow finish-rolling cooling (0.2-2.3 ℃/s), the microstructure is granular bainite, while after accelerated finish-rolling cooling (13.8 ℃/s), the microstructure is lath bainite, and the strength of the ULCB steel is significantly improved, but the toughness decreases. Based on the comprehensive analysis, the tested ULCB steel can obtain a uniform bainitic structure with stable properties within a wide process window, showing good process adaptability.

Key words: ULCB steel, CCT curve, controlled rolling and controlled cooling, microstructure, properties

中图分类号:

TG335.11

王天琪, 柴希阳, 罗小兵, 师仲然. 控轧控冷工艺对ULCB钢组织与性能的影响[J]. 金属热处理, 2025, 50(9): 146-150.

Wang Tianqi, Chai Xiyang, Luo Xiaobing, Shi Zhongran. Effect of controlled rolling and controlled cooling process on microstructure and properties of ULCB steel[J]. Heat Treatment of Metals, 2025, 50(9): 146-150.

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控轧控冷工艺对ULCB钢组织与性能的影响

Effect of controlled rolling and controlled cooling process on microstructure and properties of ULCB steel

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