軟窒化，浸硫窒化，酸窒化鋼材の焼付き改善メカニズムの検討

抄録

In this study, I investigated the mechanisms for improving the seizure resistance of nitrocarburizing, sulphonitriding, and oxynitriding steels, which are known for their excellent seizure resistance. The aim was to derive design guidelines for further seizure-resistant surface treated steel materials. A roller-on-disk friction test and surface analysis of wear scars using SEM/EDS were conducted to evaluate seizure resistance from the perspectives of friction coefficient, surface pressure, adhesion resistance, and frictional heat generation. As a result, it was revealed that sulphonitriding steel showed the most significant friction reduction effect, reducing friction by 23% compared to carburizing steel under ATF lubrication. EDS analysis revealed that sulphonitriding and oxynitriding steels exhibited superior adhesion resistance compared to nitrocarburizing and carburizing steels. Additionally, the frictional heat generation was calculated from the friction coefficient and surface pressure. This revealed that sulphonitriding steel generated less frictional heat compared to other surface treated steels, suggesting that sulphonitriding steel has superior seizure resistance compared to other surface treated steels.