B与Cu合金化对ULCB钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2025.12.035

金属热处理 ›› 2025, Vol. 50 ›› Issue (12): 227-231.DOI: 10.13251/j.issn.0254-6051.2025.12.035

B与Cu合金化对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:2025-08-02 修回日期:2025-10-17 发布日期:2026-01-06
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项目(事23G60350Z)

Effect of B and Cu alloying 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:2025-08-02 Revised:2025-10-17 Published:2026-01-06

摘要/Abstract

摘要： 基于Mn-Mo-Nb体系进行超低碳贝氏体(ULCB)钢合金设计,研究了B与Cu合金化对ULCB钢相变特性以及组织性能的影响规律。结果表明:3种合金体系的试验钢均能在较宽的冷速范围内(0.03~44 ℃/s)获得组织类型一致与硬度波动小的超低碳贝氏体组织,且相变开始温度与终了温度对冷速不敏感,表现出良好的相变稳定性和组织均匀性;Mn-Mo-Nb体系基础钢的抗拉强度为869 MPa,屈服强度为687 MPa,-40 ℃冲击吸收能量为210 J,-84 ℃冲击吸收能量为35 J;含B钢显著改善了试验钢的冲击性能,与基础钢相比,在强度水平相当的同时,-40 ℃冲击吸收能量提高了53 J,-84 ℃冲击吸收能量提高了121 J。含B+Cu钢显著改善了试验钢的强度和冲击性能,与基础钢相比,抗拉强度提高了106 MPa,屈服强度提高了81 MPa,-40 ℃冲击吸收能量提高了30 J,-84 ℃冲击吸收能量提高了100 J,具有较为优异的强韧性匹配。

关键词: ULCB钢, 合金设计, 相变特性, 组织, 性能

Abstract: Based on the Mn-Mo-Nb system, alloy design for ultra-low carbon bainitic (ULCB) steel was conducted to investigate the effects of B and Cu alloying on the phase transformation characteristics and microstructural properties of ULCB steel. The results show that all three alloy systems consistently achieve ULCB microstructures with minimal hardness fluctuations across a wide range of cooling rates(0.03-44 ℃/s). Both the phase transformation start and finish temperatures exhibit low sensitivity to cooling rates, demonstrating excellent phase transformation stability and microstructural homogeneity. The tensile strength of the Mn-Mo-Nb base steel is 869 MPa, the yield strength is 687 MPa, the impact absorbed energy at -40 ℃ is 210 J, and the impact absorbed energy at -84 ℃ is 35 J. B-bearing steel significantly improves impact absorbed energy, achieving a 53 J increase at -40 ℃ and a 121 J increase at -84 ℃ while maintaining comparable strength levels to the base steel. B+Cu-bearing steel notably enhances both strength and impact properties. Compared to the base steel, its tensile strength increases by 106 MPa, yield strength increases by 81 MPa, impact absorbed energy increases by 30 J at -40 ℃, and increases by 100 J at -84 ℃, which exhibits a relatively excellent strength-toughness matching.

Key words: ULCB steel, alloy design, phase transformation characteristics, microstructure, properties

中图分类号:

TG142.41

王天琪, 柴希阳, 罗小兵, 师仲然. B与Cu合金化对ULCB钢组织与性能的影响[J]. 金属热处理, 2025, 50(12): 227-231.

Wang Tianqi, Chai Xiyang, Luo Xiaobing, Shi Zhongran. Effect of B and Cu alloying on microstructure and properties of ULCB steel[J]. Heat Treatment of Metals, 2025, 50(12): 227-231.

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B与Cu合金化对ULCB钢组织与性能的影响

Effect of B and Cu alloying on microstructure and properties of ULCB steel

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