揭示Co元素对高强钢相变动力学、晶体学及冲击韧性的作用

喻异双; 赵靖霄; 王学林; 郭晖; 谢振家; 尚成嘉

doi:10.1007/s12613-024-2935-3

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 一校

Yishuang Yu, Jingxiao Zhao, Xuelin Wang, Hui Guo, Zhenjia Xie, and Chengjia Shang, Unraveling the significance of cobalt on transformation kinetics, crystallography and impact toughness in high-strength steels, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2935-3

Cite this article as:

Yishuang Yu, Jingxiao Zhao, Xuelin Wang, Hui Guo, Zhenjia Xie, and Chengjia Shang, Unraveling the significance of cobalt on transformation kinetics, crystallography and impact toughness in high-strength steels, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2935-3

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研究论文

揭示Co元素对高强钢相变动力学、晶体学及冲击韧性的作用

1)
北京科技大学钢铁共性技术协同创新中心, 北京 100083, 中国
2)
上海交通大学材料科学与工程学院, 上海 200240, 中国
3)
北京科技大学新金属材料国家重点实验室, 北京 100083, 中国

通讯作者:
谢振家 E-mail: zjxie@ustb.edu.cn

尚成嘉 E-mail: cjshang@ustb.edu.cn

文章亮点

(1) 研究了Co元素对高强钢相变动力学的影响规律。

(2) 明确了Co元素对高强钢变体配对及热力学的影响规律。

(3) 揭示了Co元素对调控晶体学特征与改善冲击韧性的作用。

中文摘要

钴（Co）元素广泛应用于马氏体时效钢、耐热钢、不锈钢等高合金钢。而在低合金钢中，Co元素对相变产物及力学性能的影响尚不明晰，探明Co元素在高强度低合金钢中的作用将有助于指导高强钢的设计开发。本文旨在揭示Co元素对高强钢相变动力学、晶体学及冲击韧性的作用。本文制备了含Co和不含Co的两种低合金钢，采用显微组织观察、力学性能测试和热膨胀试验研究了两种钢的相变动力学、显微组织特征以及强韧性能，揭示了Co元素对调控晶体学特征及改善冲击韧性的作用。研究结果表明，相比不含Co钢，含Co钢的Block更细，韧脆转变温度（DBTT）更低，且在贝氏体转变中间阶段（贝氏体体积分数在0.1–0.6范围）具有更高的转变速率。含Co钢冲击韧性提升与V1/V2变体对主导的高密度Block界面有关。此外，添加Co会降低贝氏体相变温度（B_S），增加相变驱动力，从而有助细化Block和形成更多V1/V2变体对。

关键词:

Research Article

Unraveling the significance of cobalt on transformation kinetics, crystallography and impact toughness in high-strength steels

+ Author Affiliations

1)
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
2)
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
3)
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

Chengjia Shang is an editorial board member for this journal and was not involved in the editorial review or the decision to publish this article. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Corresponding authors:
Zhenjia Xie E-mail: zjxie@ustb.edu.cn

Chengjia Shang E-mail: cjshang@ustb.edu.cn
Received: 29 January 2024; Revised: 13 May 2024; Accepted: 15 May 2024; Available online: 16 May 2024

Abstract

Abstract

This work reveals the significant effects of cobalt (Co) on the microstructure and impact toughness of as-quenched high-strength steels by experimental characterizations and thermo-kinetic analyses. The results show that the Co-bearing steel exhibits finer blocks and a lower ductile–brittle transition temperature than the steel without Co. Moreover, the Co-bearing steel reveals higher transformation rates at the intermediate stage with bainite volume fraction ranging from around 0.1 to 0.6. The improved impact toughness of the Co-bearing steel results from the higher dense block boundaries dominated by the V1/V2 variant pair. Furthermore, the addition of Co induces a larger transformation driving force and a lower bainite start temperature (B_S), thereby contributing to the refinement of blocks and the increase of the V1/V2 variant pair. These findings would be instructive for the composition, microstructure design, and property optimization of high-strength steels.
- high-strength steel;
- cobalt;
- transformation kinetics;
- crystallography;
- impact toughness

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