1 GPa级特厚低合金钢中带状组织对碳化物析出和韧性的影响

韩鹏; 柳志鹏; 谢振家; 王华; 金耀辉; 王学林; 尚成嘉

doi:10.1007/s12613-023-2597-6

Volume 30 Issue 7

Jul. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(7): 1329-1337

Peng Han, Zhipeng Liu, Zhenjia Xie, Hua Wang, Yaohui Jin, Xuelin Wang, and Chengjia Shang, Influence of band microstructure on carbide precipitation behavior and toughness of 1 GPa-grade ultra-heavy gauge low-alloy steel, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp. 1329-1337. https://doi.org/10.1007/s12613-023-2597-6

Cite this article as:

Peng Han, Zhipeng Liu, Zhenjia Xie, Hua Wang, Yaohui Jin, Xuelin Wang, and Chengjia Shang, Influence of band microstructure on carbide precipitation behavior and toughness of 1 GPa-grade ultra-heavy gauge low-alloy steel, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp. 1329-1337. https://doi.org/10.1007/s12613-023-2597-6

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研究论文

1 GPa级特厚低合金钢中带状组织对碳化物析出和韧性的影响

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)
海洋装备用金属材料及其应用国家重点实验室, 鞍山 114000, 中国
3)
广东省材料科学与技术实验室阳江分中心(阳江合金材料实验室), 阳江 529500, 中国

通讯作者:
谢振家 E-mail: zjxie@ustb.edu.cn

文章亮点

(1) 系统地研究了中心偏析带状组织对高强度钢碳化物析出的影响规律。

(2) 揭示了碳化物析出对1 GPa级低合金钢低温冲击断裂机理。

(3) 总结并提出了1 GPa级低合金钢高强韧钢碳化物调控方向。

中文摘要

随着海洋工程装备向大型化和轻量化发展，为满足减重、高安全和绿色需求，发展海洋工程用1 GPa级高强韧特厚规格钢板具有十分重要的意义。对于特厚高强度低合金钢而言，心部低温韧性低是限制其工业化生产和应用的难题。本文以80 mm厚1 GPa级海洋工程用钢为研究对象，系统研究了1/4和1/2板厚位置的组织和力学性能，重点阐述中心偏析导致的心部带状组织对碳化物析出行为及低温韧性的影响规律，提出超高强韧特厚低合金钢碳化物调控方案。结果表明，实验钢在淬火态时1/4和1/2板厚位置具有相似的塑性和韧性，经回火后，1/4板厚位置塑性和−40°C低温韧性分别提高50%和25%，而1/2板厚位置的韧性大幅度下降46%。显微组织表征发现，实验淬火态为下贝氏体和板条马氏体组织，仅在1/2板厚位置可以观察到明显的带状组织。经回火后，1/4板厚位置获得了均匀分布的20–100 nm短棒状M₂₃C₆和小于20nm球性MC型碳化物，这些弥散分布的细小碳化物是获得高强度和高韧性优异综合性能的关键。而1/2位置的带状组织中碳化物析出主要为200–500 nm长、20–50 nm宽的针状M₃C型碳化物。低温冲击断口分析表明，这些带状组织中形成的高密度大尺寸针状碳化物是导致冲击过程中发生解理分层断裂的主要原因，最终显著降低低温韧性。

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Research Article

Influence of band microstructure on carbide precipitation behavior and toughness of 1 GPa-grade ultra-heavy gauge low-alloy steel

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Abstract

Abstract

This study investigated the influence of band microstructure induced by centerline segregation on carbide precipitation behavior and toughness in an 80 mm-thick 1 GPa low-carbon low-alloy steel plate. The quarter-thickness (1/4t) and half-thickness (1/2t) regions of the plate exhibited similar ductility and toughness after quenching. After tempering, the 1/4t region exhibited ~50% and ~25% enhancements in both the total elongation and low-temperature toughness at −40°C, respectively, without a decrease in yield strength, whereas the toughness of the 1/2t region decreased by ~46%. After quenching, both the 1/4t and 1/2t regions exhibited lower bainite and lath martensite concentrations, but only the 1/2t region exhibited microstructure bands. Moreover, the tempered 1/4t region featured uniformly dispersed short rod-like M₂₃C₆ carbides, and spherical MC precipitates with diameters of ~20–100 nm and <20 nm, respectively. The uniformly dispersed nanosized M₂₃C₆ carbides and MC precipitates contributed to the balance of high strength and high toughness. The band microstructure of the tempered 1/2t region featured a high density of large needle-like M₃C carbides. The length and width of the large M₃C carbides were ~200–500 nm and ~20–50 nm, respectively. Fractography analysis revealed that the high density of large carbides led to delamination cleavage fracture, which significantly deteriorated toughness.
- band microstructure;
- carbides;
- toughness;
- heavy gauge steel;
- centerline segregation

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