发电机磁轭Q345C宽厚钢板探伤不合格原因分析  

Analysis of unqualified causes of generator yoke Q345C heavy and wide plate

作　　者：张雪凌 李茂林 ZHANG Xueling;LI Maolin(NCS Testing Technology Co.,Ltd.,Beijing 100081,China;Nuclear and Radiation Safety Center,Ministry of Ecology and Environment of the People's Republic of China,Beijing 100082,China)

机构地区：[1]钢研纳克检测技术股份有限公司,北京100081 [2]中华人民共和国生态环境部核与辐射安全中心,北京100082

出　　处：《物理测试》2022年第6期41-45,共5页Physics Examination and Testing

摘　　要：针对发电机磁轭Q345C宽厚钢板超声波探伤不合格现象,应用拉伸试验机、冲击试验机、金相显微镜、扫描电子显微镜及能谱仪等分析测试手段,通过对其进行拉伸性能、冲击性能、低倍形貌、夹杂物、微观组织、显微形貌及能谱分析等一系列研究,分析了发电机磁轭Q345C宽厚钢板超声波探伤不合格的原因。分析认为,发电机磁轭Q345C宽厚钢板超声波探伤不合格是由于钢板在距离下表面23 mm处有一条黑色缺陷带,缺陷检测的平面区域形状为U型,缺陷宽度超过70 mm,缺陷主要为氧化物夹杂、孔洞和中心疏松。为了提高发电机磁轭Q345C宽厚钢板的超声波探伤合格率,通过严格控制炼钢各环节,加强钢水精炼控制,提高钢水纯净度,降低钢水中氧含量,控制钢中夹杂的含量和形态,以提高钢坯内部质量。The phenomenon of unqualified ultrasonic flaw detection results of generator yoke Q345C heavy and wide plate was studied. The tensile testing machine, impact testing machine, metallographic microscope, scanning electron microscopy and energy dispersive spectrometer were employed for the comprehensive analysis including the tensile properties, impact performance, macroscopic morphology, inclusion, microstructure, macrographic morphology and spectral analysis. The causes for the unqualified ultrasonic flaw detection results of generator yoke Q345C heavy and wide plate were analyzed. The experimental results showed that it was due to a black defect zone at 23 mm from the lower surface of steel plate. The detected plane domain of defects was U-shaped. The defect width exceeded 70 mm. The main defects were oxide inclusions, holes and center porosity. In order to improve the qualification rate of ultrasonic inspection of generator yoke Q345C heavy and wide plate, all aspects of steelmaking should be strictly controlled to strengthen the steel refining, improve the purity of molten steel, reduce the oxygen content in molten steel, and control the content and morphology of inclusions in steel to improve the internal quality of billets.

关 键 词：Q345C宽厚钢板 超声波探伤 氧化物夹杂 孔洞 中心疏松 

分 类 号：TM31[电气工程—电机] TG142.15[一般工业技术—材料科学与工程]