板材探伤不合格原因的分析  

Analysis of Reasons for Detection Disqualification of Plates

作　　者：温娟[1] 罗家明[1] 刘晓岚[1] 尹立新[1] 任群[1] 

机构地区：[1]首钢技术研究院理化检测中心,北京100041

出　　处：《物理测试》2006年第6期34-37,共4页Physics Examination and Testing

摘　　要：一批桥梁板材,轧制后钢板有探伤不合格的情况。本文应用原位成分分析、金相检验、扫描电镜和显微硬度等分析方法,对此热轧板探伤不合格的原因进行了探讨。结果表明,由于碳在板材心部的偏析,使钢板中心出现了贝氏体组织,而导致探伤不合格。High rejection rate of ultrasonic non-destructive testing was found for a batch of hot-rolled bridge plates. The reasons for disqualification of plates were investigated by means of in-situ composition analysis, metallography, scanning electron microscope and microhardness analyses. It was found that bainite appears at the center position of the bridge plates, due to the stabilisation of austenite caused by the severe segregation of C, S etc. Bainite is the main reason for disqualification of the plates.

关 键 词：中心偏析 显微硬度 贝氏体 

分 类 号：TG115.28[金属学及工艺—物理冶金]