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在渗碳层的所谓表面区(即厚度达25～30微米的表层),其淬透性会因渗碳过程中发生内氧化而降低。淬透性的降低导致淬火后在此区域出现奥氏体的非马氏体分解产物,因而恶化了钢的使用性能,其中包括抗擦伤性能。因此,控制淬火冷却速度,通过加强油的搅拌使渗碳件在最佳条件下淬火和保证淬火设备中的淬火油有足够的流速就有其现实
In the so-called surface area of the carburized layer (ie, a surface layer having a thickness of 25 to 30 μm), the hardenability of the carburized layer is reduced by internal oxidation during carburization. A decrease in hardenability results in the formation of non-martensitic decomposition products of austenite in this region after quenching, thereby deteriorating the serviceability of the steel, including the scratch resistance. Therefore, the control of quenching cooling rate, by strengthening the oil mixing carburizing parts quenching under the best conditions and ensure quenching equipment quenching oil have enough flow rate has its reality