冷轧硅脱氧304不锈钢中氧化物夹杂的演变行为

 为实现固态钢基体内夹杂物在冷轧过程中的控制，将硅脱氧304不锈钢热轧板经多道次冷轧至不同的厚度，利用扫描电子显微镜对试样内夹杂物在冷轧过程中的演变行为进行了研究。结果表明，硅脱氧304不锈钢内夹杂物的类型主要为低熔点SiO2-CaO-MnO-Al2O3，其在热轧板内的形貌为大尺寸长条状。冷轧时，这些长度为2.0～23.0 μm的长条状氧化物夹杂发生断裂，形成多个1.0～3.0 μm小尺寸夹杂物。随着冷轧压下量的增加，断裂后形成的夹杂物尺寸逐渐减小。但当夹杂物尺寸降低至约0.5 μm时，夹杂物不再发生断裂。同时，断裂后形成的小尺寸夹杂物之间的距离与夹杂物的初始尺寸无关，由冷轧板的伸长率决定。

Evolution of oxide inclusions in Si-killed 304 stainless steel during cold rolling

In order to achieve effective control of inclusions in solid-state steel during cold rolling，the hot rolled plates of 304 stainless steel deoxidized by Si were cold rolled into different thicknesses through multi-pass rolling process，and the deformation of oxide inclusions during cold rolling was investigated by a scanning electron microscope. The experimental results show that the inclusions in Si-killed 304 stainless steel were mainly low melting point SiO2-CaO-MnO-Al2O3. The morphology of these inclusions in hot rolled plates were mainly long-strip. During cold rolling process，the long-stripe oxide inclusions with 3.0 to 23.0 μm in length were fractured and changed into finer inclusions with 0.5 to 3.0 μm in size. The size of the small fractured particles gradually decreased with increasing cold rolling reduction. When the size of the fractured particles was reduced to about 0.5 μm，the particles were not fractured anymore. The distances among the fractured particles were not concerned with original length of the inclusions， which were determined by the elongation of cold rolled plates.