Q345高强度宽厚钢板探伤缺陷原因及分析

材料热处理学报, 2015, 36(5): 117-122.

Q345高强度宽厚钢板探伤缺陷原因及分析

李婧 ^1, , 邵长静 ^2, , 刘相华 ^3, , 赵德文 ^4,

1.辽宁石油化工大学机械工程学院,辽宁抚顺113001;东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

2.辽宁装备制造职业技术学院,辽宁沈阳,110161

3.东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳,110819

4.东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳,110819

基金项目: 辽宁省博士启动基金(20131062) 国家自然科学基金(51374069)

关键词：特厚板 , 探伤 , 微裂纹 , 偏析 , 夹杂物

Reason analysis on defects of Q345 ultra-heavy high strength steel plate by ultrasonic inspection

Keywords： ultra-heavy steel plate , inspection , micro-crack , segregation , inclusion

针对厚度超过90 mm Q345特厚钢板超声波探伤合格率较低的现象,采用高倍金相检验、扫描电镜、能谱分析和力学分析等方法对90 mm Q345超声波探伤检测不合格与合格钢板进行了对比研究.结果表明:引起特厚板超声波探伤不合格的原因是钢板厚度中心区域珠光体带中存在微裂纹.微裂纹产生的原因一方面是铸坯中心碳、锰元素偏析引起的组织应力及钢板轧后快速冷却引起的热应力,另一方面是钢板心部MnS和氧化物等夹杂物的聚集致使与钢基体界面结合较弱,促进了微裂纹的萌生与扩展.通过改善铸坯质量、合理选择宽厚板铸坯坯型和合理安排轧制规程,有效提高了Q345宽厚板的超声波探伤检测合格率.

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