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25.1μm,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Al_(2)O_(3)和CaS-MnS复合夹杂,以Al_(2)O_(3)颗粒为异质形核点,对其冲击吸收能量无明显影响。
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 25.1μm,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 Al_(2)O_(3)and CaS-MnS composite inclusions,with Al_(2)O_(3)particles as heterogeneous nucleation sites,which have no obvious impact on the impact absorbed energy.
作者
黄知洋
袁清
梁文
包琳琳
熊乐
Huang Zhiyang;Yuan Qing;Liang Wen;Bao Linlin;Xiong Le(School of Optoelectronic Manufacturing,Zhejiang Industry and Trade Vocational College,Wenzhou Zhejiang 325000,China;State Key Laboratory of Advanced Refractories,Wuhan University of Science and Technology,Wuhan Hubei 430081,China;Technical Center,Hunan Valin Lianyuan Iron and Steel Co.,Ltd.,Loudi Hunan 417009,China)
出处
《金属热处理》
北大核心
2025年第12期55-62,共8页
Heat Treatment of Metals
基金
湖北省自然科学基金面上项目(2024AFB900)。
关键词
Q460钢
冲击吸收能量
单值波动
析出
夹杂颗粒
Q460 steel
impact absorbed energy
individual value fluctuation
precipitation
inclusion particles
