친환경적인 상용 액슬 기어 침탄 열처리 공정 최적화 연구

The effects of Nb, Ti additions on the microstructure and carburizing properties have been investigated. The main changes in the microstructure caused by Nb, Ti additions were grain refinement and grain coarsening temperatures(GCT) were highly increased. From the above reasons, high temperature vacuum carburizing heat-treatment process was established.