耐腐蚀桥梁钢板超声波探伤缺陷分析及改进措施  

Defects Analysis in Ultrasonic Flaw Detection for Corrosion-resistant Bridge Steel and Improvement Measures

作　　者：侯纪新[1] 肖震东 王晓南[1] 章顺虎[1] 

机构地区：[1]苏州大学沙钢钢铁学院,江苏苏州215021

出　　处：《热加工工艺》2015年第24期232-234,237,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51305285;51401139);江苏省基础研究计划自然科学基金-青年基金项目BK20130304;BK20130315

摘　　要：利用金相、扫描电镜及金属原位统计分析等技术研究了某桥梁钢板超声波探伤缺陷区域,发现在钢板厚度中心区域存在严重的带状组织,C元素在带状组织中分布极不均匀,存在明显偏析。同时,在该区域还存在大量的非金属夹杂物。结果表明:钢板厚度中心区域C元素严重偏析及大量非金属夹杂物的耦合作用是引起钢板超声波探伤不合格的主要原因。The defects zone in ultrasonic flaw detection of corrosion-resistant bridge steel were studied by metallographic analysis, SEM and original position analysis. The serious band structure is found in the central area of the thickness-direction of steel. The distribution of C element in band structure is ununiform, generatingg obvious segregation. At the same time, large numbers of nonmetal inclusions exist in the central area in the thickness-direction of steel. The resuks show that the coupling of segregation of C in the central erea in the thickness direction of steel and massive nonmetallic inclusions cause the disqualification in ultrasonic flaw detection.

关 键 词：桥梁钢 超声波探伤 偏析 夹杂物 

分 类 号：TF777.1[冶金工程—钢铁冶金]