LAUSR

Carburization is generally applied to components of transportation equipment such as gears and shafts to improve their fatigue strength and wear resistance. Increase in carburization temperature enables reduction of the processing time and thereby it leads to improvement in productivity and reduction in manufacturing cost. When a carburization depth of 1 mm is considered, for example, 12 h is required at a carburization temperature of 930°C, while it is only 3 h at 1 050°C.1) This reduction of the processing time can be applied to an effective production of large components such as those of huge construction equipment, which usually require a longer-time carburization process. However, Effects of Concentrations of Micro-alloying Elements and Hotforging Temperature on Austenite Grain Structure Formed during Carburization of Case-hardening Steel