低碳高强舰船用钢的CCT曲线及其组织性能

doi:10.13251/j.issn.0254-6051.2022.04.010

金属热处理 ›› 2022, Vol. 47 ›› Issue (4): 63-68.DOI: 10.13251/j.issn.0254-6051.2022.04.010

低碳高强舰船用钢的CCT曲线及其组织性能

陈连生¹, 张露友¹, 田亚强¹, 杨子旋², 李红斌¹, 潘红波³, 魏英立¹

1.华北理工大学教育部现代冶金技术重点实验室, 河北唐山 063210;
2.宁波大学冲击与安全工程教育部重点试验室, 浙江宁波 315211;
3.安徽工业大学冶金减排与资源综合利用教育部重点试验室, 安徽马鞍山 243002

收稿日期:2021-10-22 修回日期:2022-01-05 出版日期:2022-04-25 发布日期:2022-05-19
通讯作者: 田亚强,教授,博士,E-mail:tyq@ncst.edu.cn
作者简介:陈连生(1968—),男,教授,博士生导师,主要研究方向为金属材料及塑性成形工艺,E-mail: kyckfk@ncst.edu.cn。
基金资助:
国家自然科学基金(51801106,U1860105);河北省钢铁联合基金(E2020209040,E2020209124,E2020209127)

CCT curves and microstructure and properties of low-carbon high strength marine steel

Chen Liansheng¹, Zhang Luyou¹, Tian Yaqiang¹, Yang Zixuan², Li Hongbin¹, Pan Hongbo³, Wei Yingli¹

1. Key Laboratory of the Ministry of Education for Modern Metallurgy Technology, North China University of Science and Technology, Tangshan Hebei 063210, China;
2. Key Laboratory of Impact and Safety Engineering, Ministry of Education of China, Ningbo University, Ningbo Zhejiang 315211, China;
3. Key Laboratory of Metallurgical Emission Reduction and Resources Recycling of Ministry of Education, Anhui University of Technology, Ma'anshan Anhui 243002, China

Received:2021-10-22 Revised:2022-01-05 Online:2022-04-25 Published:2022-05-19

摘要/Abstract

摘要： 采用Gleeble-3500热模拟试验机、光学显微镜和扫描电镜等研究了低碳高强舰船用钢的连续冷却转变曲线(CCT曲线)及热轧后终冷温度对组织性能的影响。结果表明,试验钢连续冷却转变只发生了铁素体、贝氏体相变。试验钢轧后快速冷却至不同终冷温度立即空冷工艺下,室温组织主要为贝氏体和多边形铁素体,且随着终冷温度降低,贝氏体的含量增多。与直接空冷至室温相比,随着终冷温度提高,试样的强度呈先降低后增加趋势,然而,终冷温度提高到650 ℃时,试样强度却降低。终冷温度为600 ℃时,屈服强度和抗拉强度最高,分别为644.28 MPa和为679.71 MPa,－20 ℃的冲击吸收能量最优,为112 J。

关键词: 低碳高强度舰船钢, CCT曲线, 终冷温度, 显微组织, 力学性能

Abstract: Continuous cooling transformation curve (CCT curve) and effect of final cooling temperature after hot rolling on microstructure and properties of low-carbon high strength marine steel were studied by Gleeble-3500 thermal simulation test machine, optical microscope and scanning electron microscope. The results show that only ferrite and bainite transformations take place during the continuous cooling transformation of the tested steel. In the process of air cooling immediately after hot rolling and rapid cooling to different final cooling temperature, the room temperature microstructure is bainitic and polygonal ferrite, and the content of bainitic increases with the decrease of final cooling temperature. Compared with direct air cooling to room temperature, with the increase of final cooling temperature, the strength of the tested steel decreases at first and then increases, However, when the final cooling temperature increases to 650 ℃, the strength of the tested steel decreases. When the final cooling temperature is 600 ℃, the yield strength and tensile strength is the highest, as 644.28 MPa and 679.71 MPa respectively, and the best impact absorbed energy is 112 J at -20 ℃.

Key words: low-carbon high strength marine steel, CCT curve, final cooling temperature, microstructure, mechanical properties

中图分类号:

TG142.4

陈连生, 张露友, 田亚强, 杨子旋, 李红斌, 潘红波, 魏英立. 低碳高强舰船用钢的CCT曲线及其组织性能[J]. 金属热处理, 2022, 47(4): 63-68.

Chen Liansheng, Zhang Luyou, Tian Yaqiang, Yang Zixuan, Li Hongbin, Pan Hongbo, Wei Yingli. CCT curves and microstructure and properties of low-carbon high strength marine steel[J]. Heat Treatment of Metals, 2022, 47(4): 63-68.

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低碳高强舰船用钢的CCT曲线及其组织性能

CCT curves and microstructure and properties of low-carbon high strength marine steel

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