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利用光学显微镜对430铁素体不锈钢板坯表面振痕深度和形貌进行观察。结果表明:利用金相法测量振痕深度,测量的结果可以达到很高的精度。430连铸坯表面边部振痕深且紊乱,中部振痕浅、分布比较均匀。上表面边部和中部振痕深度平均值分别为320.847 6μm和247.886μm;下表面边部和中部振痕深度平均值为301.753μm和221.753 6μm。430不锈钢深振痕谷底有微裂纹和偏析带存在。通过优化结晶器的振频、振幅及保护渣黏度等工艺参数可以显著减小430板坯的振痕深度。
The depth and topography of the surface vibration marks of 430 ferritic stainless steel slab were observed with optical microscope. The results show that the measurement results can reach very high accuracy by measuring the depth of oscillation mark by the metallographic method. 430 billet surface edge marks deep and disorder, the central vibration marks shallow, more evenly distributed. The average depth of the upper surface edge and the middle vibration marks were 320.847 6μm and 247.886μm respectively; the average depths of the lower surface edge and the middle vibration marks were 301.753μm and 221.753 6μm. 430 deep stainless steel deep vibration marks the presence of micro-cracks and segregation zone. By optimizing the mold vibration frequency, amplitude and slag viscosity and other process parameters can significantly reduce the 430 slab vibration mark depth.