金属热处理 ›› 2025, Vol. 50 ›› Issue (12): 55-62.DOI: 10.13251/j.issn.0254-6051.2025.12.009

• 组织与性能 • 上一篇    下一篇

建筑结构用Q460钢冲击吸收能量单值波动原因分析

黄知洋1,2, 袁清2, 梁文3, 包琳琳2, 熊乐2   

  1. 1.浙江工贸职业技术学院 光电制造学院, 浙江 温州 325000;
    2.武汉科技大学 先进耐火材料全国重点实验室, 湖北 武汉 430081;
    3.湖南华菱涟源钢铁有限公司 技术中心, 湖南 娄底 417009
  • 收稿日期:2025-07-25 修回日期:2025-10-05 发布日期:2026-01-06
  • 通讯作者: 袁 清,副教授,博士,E-mail:yuanqing@wust.edu.cn
  • 作者简介:黄知洋(1987—),男,讲师,硕士,主要研究方向为数字化设计与制造,E-mail:273888958@qq.com。
  • 基金资助:
    湖北省自然科学基金面上项目(2024AFB900)

Causes analysis of individual-value fluctuation in impact absorbed energy for Q460 building structure steel

Huang Zhiyang1,2, Yuan Qing2, Liang Wen3, Bao Linlin2, Xiong Le2   

  1. 1. School of Optoelectronic Manufacturing, Zhejiang Industry and Trade Vocational College, Wenzhou Zhejiang 325000, China;
    2. State Key Laboratory of Advanced Refractories, Wuhan University of Science and Technology, Wuhan Hubei 430081, China;
    3. Technical Center, Hunan Valin Lianyuan Iron and Steel Co., Ltd., Loudi Hunan 417009, China
  • Received:2025-07-25 Revised:2025-10-05 Published:2026-01-06

摘要: 高强钢冲击吸收能量“两高一低”单值波动现象频出,且常见于中厚板。针对此现象,从微观组织、夹杂物分布规律以及第二相颗粒析出分布3个角度,对Q460钢板相邻位置的高冲击吸收能量试样和低冲击吸收能量试样进行综合对比分析,分析其单值波动原因。结果表明,低冲击吸收能量试样贝氏体体积分数为16.71%,平均晶粒尺寸为25.1 μm,大尺寸方形Ti(C, N)颗粒平均尺寸为131.03 nm,且尺寸大于100 nm颗粒体积分数为65.12%。相较高冲击吸收能量试样,低冲击吸收能量试样的贝氏体含量较低、晶粒尺寸较大以及大尺寸方形析出相颗粒更多,显著促进裂纹萌生与扩展。另外,两试样的夹杂物数量和尺寸无明显差异,多为椭球形Al2O3和CaS-MnS复合夹杂,以Al2O3颗粒为异质形核点,对其冲击吸收能量无明显影响。

关键词: Q460钢, 冲击吸收能量, 单值波动, 析出, 夹杂颗粒

Abstract: The "two highs and one low" fluctuation phenomenon in the impact absorbed energy of high-strength steel occurs frequently, especially in medium and heavy plates. Regarding the phenomenon, a comprehensive comparative analysis of Q460 steel plate specimens with high and low impact absorbed energy was conducted from three perspectives of microstructure observation, inclusion distribution, and distribution of precipitated second-phase particles. The results show that for the specimen with low impact absorbed energy, the volume fraction of bainite is 16.71%, the average grain size is 25.1 μm, the average size of large-sized square Ti(C, N) particles is 131.03 nm, and the volume fraction of particles with a size larger than 100 nm is 65.12%. Compared with the specimen with high impact absorbed energy, the specimen with low impact absorbed energy has lower bainite content, larger grain size, and more large-sized square precipitated phase particles, which significantly promote the initiation and propagation of cracks. In addition, there is no significant difference in the quantity and size of inclusions between the two specimens. The inclusions in the two specimens are ellipsoidal Al2O3 and CaS-MnS composite inclusions, with Al2O3 particles as heterogeneous nucleation sites, which have no obvious impact on the impact absorbed energy.

Key words: Q460 steel, impact absorbed energy, individual value fluctuation, precipitation, inclusion particles

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