热轧不锈钢复合板界面氧化物夹杂的形成机制

 以不锈钢-低合金钢复合板为研究对象，利用光学显微镜及扫描电镜对复合界面附近的夹杂物进行了分析。研究发现，不锈钢复合板界面处夹杂物主要为氧化物，其成分与复合界面处的真空度有关。在较低的真空度下(真空度大于15Pa)，氧化物夹杂的成分以硅为主，在较高的真空度下(真空度小于0.1Pa)，夹杂的成分以铝为主。界面氧化物夹杂主要是由于高温下钢中的Al、Si和Mn等元素向复合界面处扩散并被氧化形成的。由试验结果也可知，随着真空度的降低，界面氧化也变得更加明显，当真空度的值从0.1Pa增加到20Pa左右时，界面氧化物的体积分数从15%提高到了50%。

Formation Mechanism of Oxide Inclusion on the Interface of Hot-Rolled Stainless Steel Clad Plates

The inclusions on the bonded interface were analyzed by optical microscopy (OA) and scanning electron microscopy (SEM), and the formation mechanism of oxide inclusions was investigated and discussed. The results show that the inclusions are mainly made of oxides. The chemical composition of oxide inclusions can also be related to vacuum degree inside the clad metal slab, in which silicon dominated at the vacuum degree of 15Pa or higher and the aluminum did at the vacuum degree of 0.1Pa or lower. It can be considered that the oxide inclusions were formed due to the oxidation of aluminum, silicon, manganese elements diffusing from the inside to interfaces to be bonded of metals. The experimental results also indicate that oxidation also become more evident with the reduction in vacuum degree, and the proportion of oxide inclusions increases to 50% from 15% with the decrease of vacuum degree from 0.1Pa to near 15Pa.