桥梁钢板冲击功数值波动原因分析及改善措施  

Cause Analysis and Improvement Measures for Fluctuation of Impact Energy Values of Bridge Steel Plate

作　　者：王运苗 秦坤[1] 马欣然 Wang Yunmiao;Qin Kun;Ma Xinran(Tangshan Medium and Heavy Plate Co.,Ltd.)

机构地区：[1]唐山中厚板材有限公司

出　　处：《宽厚板》2023年第4期36-38,共3页Wide and Heavy Plate

摘　　要：针对生产钢板冲击功数据波动现象,采用金相分析法对桥梁钢不同厚度位置的组织晶粒进行对比研究,结果表明:接近钢板表面组织及性能良好,造成钢板冲击功数值偏低主要是钢板心部晶粒粗化以及带状组织和夹杂物等方面的原因。通过适当提高水冷却速率,细化了晶粒,通过抑制过冷奥氏体中的碳化物析出,减轻了带状组织影响,细小铁素体的析出使夹杂物破坏作用得到缓解,实现了冲击功值的稳定以及钢板性能的改善。In response to the fluctuation of impact energy data for the produced steel plates,a comparative study is conducted on the microstructure and grains of bridge steel at different thickness positions using metallographic analysis.The results show that the microstructure and properties close to the surface of the steel plate are good,and the main reason for the low impact energy value of the steel plate is due to factors such as grain coarsening in the center of the steel plate,banded structure and inclusions.By increasing the cooling rate of water cooling,the grain size is refined,and the influence of banded structure is reduced by suppressing the precipitation of carbides in undercooled austenite.The precipitation of fine ferrite relieves the destructive effect of inclusions,achieving stable impact energy value and improving steel plate performance.

关 键 词：冲击功 带状组织 夹杂物 冷却速率 冷却时间 

分 类 号：TG142.1[一般工业技术—材料科学与工程] U441[金属学及工艺—金属材料]