<strong>V</strong>分布特性对新型<strong>980 MPa</strong>级海工特厚板用钢淬透性的影响

doi:10.11900/0412.1961.2024.00010

金属学报

2025, Vol. 61

Issue (9): 1344-1352 DOI: 10.11900/0412.1961.2024.00010

研究论文

本期目录 | 过刊浏览

V分布特性对新型980 MPa级海工特厚板用钢淬透性的影响

傅万堂¹(

), 王薇¹, 任利国¹^,², 白兴红¹^,², 吕知清¹, 李荣斌³, 刘浩楠¹, 齐建军⁴

1 燕山大学亚稳材料全国重点实验室秦皇岛 066004
2 天津重型装备工程研究有限公司天津 300399
3 上海电机学院上海热加工工程技术研究中心上海 201306
4 河钢集团有限公司石家庄 050023

Effect of V Distribution Characteristics on the Hardenability of a Novel 980 MPa Grade Extra-Thick Steel Plate for Marine Engineering

FU Wantang¹(

), WANG Wei¹, REN Liguo¹^,², BAI Xinghong¹^,², LV Zhiqing¹, LI Rongbin³, LIU Haonan¹, QI Jianjun⁴

1 State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
2 Tianjin Heavy Equipment Engineering Research Co. Ltd., Tianjin 300399, China
3 Shanghai Engineering Research Center for Hot Manufacturing of Heavy Forgings, Shanghai Dianji University, Shanghai 201306, China
4 HBIS Group Technology Research Institute, Shijiazhuang 050023, China

引用本文:

傅万堂, 王薇, 任利国, 白兴红, 吕知清, 李荣斌, 刘浩楠, 齐建军. V分布特性对新型980 MPa级海工特厚板用钢淬透性的影响[J]. 金属学报, 2025, 61(9): 1344-1352.
Wantang FU, Wei WANG, Liguo REN, Xinghong BAI, Zhiqing LV, Rongbin LI, Haonan LIU, Jianjun QI. Effect of V Distribution Characteristics on the Hardenability of a Novel 980 MPa Grade Extra-Thick Steel Plate for Marine Engineering[J]. Acta Metall Sin, 2025, 61(9): 1344-1352.

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摘要:

提高淬透性以使板厚方向组织性能均匀化是海洋工程用高品级特厚钢板生产的技术关键和难点。本工作通过热膨胀和Jominy末端淬火实验，并结合铝固氮处理，研究了V分布状态对一种新型980 MPa级海工特厚板用钢在850和910 ℃奥氏体化后的淬透性及显微组织的影响规律。采用EPMA、SEM和TEM等手段表征了钢的显微组织和V原子的分布特性。结果表明，910 ℃奥氏体化过程中AlN的产生能够促进V原子在原奥氏体晶界上的偏聚，提高过冷奥氏体的稳定性并延缓先共析铁素体的转变，从而有效提高海工钢特厚板的淬透性，使其在更宽的冷速范围(对应于更厚的钢板截面)内组织与性能均匀性更好、强韧性匹配度更高。

关键词 ：特厚板, 淬透性, V偏聚, AlN, Jominy实验

Abstract：

Improving the hardenability of a ferrous alloy to achieve uniform microstructures and mechanical properties along the direction of the plate thickness is a key challenge in the production of high-grade extra-thick steel plates suitable for marine engineering (hereinafter referred to as “marine steel”). Hence, in this study, the effect of V distribution on the microstructures and hardenability of marine steel was investigated by employing the following procedure: a novel 980 MPa grade extra-thick steel plate was subjected to austenitization at 850 and 910 ^oC; subsequently, through thermal expansion and Jominy end-quench tests combined with fixed nitrogen treatment with aluminum. The microstructures and state of V atoms in the marine steel sample were characterized using SEM, EPMA, and TEM. Results showed that the occurrence of AlN during austenitizing at 910 ^oC promoted the segregation of V atoms on the original austenite grain boundaries, improved the stability of undercooled austenite, and delayed the transformation of proeutectoid ferrite. Thus, this study showed that the incorporation of V in marine steel substantially improved the hardenability of marine steel over a wide range of cooling rates (corresponding to steel plates with thicker cross-sections) and facilitated better microstructure uniformity, performance in marine environments, and matching between the required strength and toughness.

Key words： extra-thick plate hardenability V segregation AlN Jominy test

收稿日期: 2024-01-15

ZTFLH:

TG142.1

基金资助:国家自然科学基金项目(52171050);河北省高端钢铁冶金联合基金项目(E2020203195);上海大件热制造工程技术研究中心开放课题项目(18DZ2253400)

通讯作者: 傅万堂，wtfu@ysu.edu.cn，主要从事先进钢铁材料、大型铸锻件材料与制造技术等方面的研究

Corresponding author: FU Wantang, professor, Tel: 18633525885, E-mail: wtfu@ysu.edu.cn

作者简介: 傅万堂，男，1966年生，教授，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2024.00010 或 https://www.ams.org.cn/CN/Y2025/V61/I9/1344

图1 在850和910 ℃奥氏体化后实验用钢的Jominy曲线

图2 连续冷却转变(CCT)曲线及显微硬度随冷却速率的变化曲线(910 ℃，30 min)

图3 910和850 ℃奥氏体化后距淬火端不同位置处实验用钢显微组织的OM像

图4 910和850 ℃奥氏体化30 min后实验用钢原始奥氏体晶界形貌的SEM像

图5 实验用钢中AlN和VN析出曲线的Thermo-Calc计算结果

图6 实验用钢经910 ℃奥氏体化30 min后淬火的TEM像及EDS分析结果

图7 实验用钢经850 ℃奥氏体化30 min后淬火的TEM明场像和元素分布面扫图

图8 不同温度奥氏体化30 min后淬火的原奥氏体晶界及对应的V分布EPMA结果

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