Cr12N钢高压凝固钢锭的气泡分布

Bubble distribution of Cr12N high-pressure solidification ingot

在冶炼Cr12N铁素体高氮钢时,发现钢锭中有气泡产生,但随着凝固压力的增加,气泡含量越来越少。当熔炼压力0.6 MPa,凝固压力由1.0 MPa增加到1.6 MPa时,气泡数量的平均值由46.37个/mm2降到9.46个/mm2,气泡量下降到原来的20.4%;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%。熔炼压力0.3 MPa凝固压力1.6 MPa的钢锭,下表面的气泡平均面积含量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是中心位置处的25.9%。根据建立的计算钢锭中实际氮含量模型可知,当熔炼压力为0.6 MPa凝固压力增加到1.8 MPa时,可得到没有气泡的高氮钢锭。

There are a number of bubbles when Crl2N stainless steel is smelted. But its number is smaller and smaller with the increasing of solidification pressure. When the melting pressure is 0.6 MPa and the solidification pressure increases from 1.0 to 1.6 MPa, the average number of bubbles decreases from 46.37 to 9.46 per square millimeter. Bubble number is reduced by 20. 4%. The number of bubbles whose diameters are greater than 20μm is reduced to 17.4%, while the number of bubbles whose diameters are less than 5μm increases by 37.7%. With 0.3 MPa melting pressure and 1.6 MPa solidification pressure, the average bubble size content near the lower surface is 23.9% of that near the upper surface. Average bubble size content at the edge is 25.9% of that at the center. According to the actual nitrogen content in steel ingot calculated by the established mathematical model, no hubbles of high nitrogen steel ingot may be obtained when melting pressure is 0.6 MPa and solidification pressure increases to 1.8 MPa.