The surface structure development of the in situ‐formed oxide layer on carbon‐bonded alumina refractory samples immersed in liquid 42CrMo4 steel at a temperature of 1650 °C is studied. The surface morphology is characterized using areal parameters such as the developed interfacial area ratio S_dr, the texture aspect ration S_tr, the arithmetic mean peak curvature S_pc, the density of peaks S_pd, and the maximum height S_z defined in ISO 25178‐2:2012 and on the basis of own defined parameters using laser‐optical measured line profiles of the surface's height. The development of the surface morphology is found to be independent of the oxygen content of the steel melt at immersion time. The formed crystal structures are based on alumina and an (Al, Fe, Mg, Mn)‐containing spinel. The spinel's lattice parameters are found to vary between 8.0367 and 8.1194 Å corresponding to oxygen contents of the steel melt between 30 and 85 ppm.

中文翻译：

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钢熔体/碳键氧化铝界面处原位形成的氧化物层的表征

研究了在1650°C下浸入液态42CrMo4钢中的碳键氧化铝耐火样品上原位形成的氧化物层的表面结构发展。使用表面参数来表征表面形貌，例如已开发的界面面积比S _dr，纹理长宽比S _tr，算术平均峰曲率S _pc，峰密度S _pd和最大高度S _z在ISO 25178-2：2012中定义，并基于自己定义的参数，使用激光光学测量的表面高度的线轮廓。发现表面形态的发展与浸入时钢水的氧含量无关。形成的晶体结构是基于氧化铝和（铝，铁，镁，锰）尖晶石的。发现尖晶石的晶格参数在8.0367至8.1194Å之间变化，对应于钢液中的氧含量在30至85 ppm之间。