【摘要】 采用金相显微镜、扫描电子显微镜和EDS技术对Q345B低合金钢连铸板坯以及中板表面出现的微裂纹进行研究。结果发现在连铸坯以及中板的一些晶界、氧化层、微裂纹表面具有铜砷锡的偏聚,探讨了铜砷锡残余元素促进裂纹形成的影响机理,为减少和防止残余元素对钢材表面质量的危害性提供依据。更多还原

【Abstract】 Based on metallographic, scanning electron microscope and EDS analysis methods, the surface microcracks of continuous cast slabs and the hot-rolled plates of Q345B low alloy steel were studied.The results show that copper, arsenic and tin segregates at grain boundaries, oxidation layer and microcrack surface in the continuous cast slabs and steel plates.The effect mechanism of residual elements on surface microcracks are analyzed, some counter-measures for preventing and controlling surface microcracks are proposed.更多还原