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针对冶炼Cr12N铁素体不锈钢时有气泡产生的现象。用蔡司显微镜对冶炼出的钢锭进行观察并采用图像分析软件对得到的图片进行分析处理,得到气泡的分布规律。结果表明:当熔炼压力0.6 MPa时,凝固压力由1.0MPa增加到1.6 MPa,气泡数量的平均值由46.37个/mm2降到9.46个/mm2;直径大于20μm的气泡数量下降到原来的17.4%,而直径小于5μm的气泡数量增加了37.7%;但随着凝固压力的增加,气泡面积百分比越来越小。在熔炼压力0.3 MPa凝固压力1.6 MPa条件下得到的钢锭,其下表面的气泡平均面积含量比例是上表面气泡含量的23.9%,边缘位置处的气泡平均面积含量比例是中心位置处的25.9%。
For smelting Cr12N ferritic stainless steel bubble phenomenon. Observe the smelting ingot with Zeiss microscope and analyze the obtained picture by image analysis software to get the bubble distribution law. The results show that when the melting pressure is 0.6 MPa, the solidification pressure increases from 1.0 MPa to 1.6 MPa, the average number of bubbles decreases from 46.37 / mm2 to 9.46 / mm2. The number of bubbles with a diameter greater than 20 μm drops to 17.4% While the number of bubbles with the diameter less than 5μm increased by 37.7%; however, with the increase of the solidification pressure, the percentage of bubble area became smaller and smaller. In the steel ingot obtained under the condition of 0.3 MPa melting pressure and 1.6 MPa solidification pressure, the average content of air bubbles in the lower surface is 23.9% of the bubble content in the upper surface and 25.9% of the average in the edge position.