Surface Rolling Properties and Surface Durability of 1.5Cr-0.2Mo Sintered Alloy Steel Rollers

Abstract

Fundamental surface rolling experiments were carried out using rollers of 1.5Cr-0.2Mo alloyed sintered steel having the density of 7.00∼7.55 g/cm³. A high precision CNC form rolling machine of 2-roller dies transverse type was employed. Pore distributions and endurance limits in rolling contact fatigue were investigated. After rolling, casehardening was conducted. The surface densification of this P/M material with the initial density of 7.25 g/cm³ or more has possibilities to make the part surface to a depth fully dense by optimizing the rolling condition. The surface fatigue durability of rolled P/M rollers with the initial density of 7.55 g/cm³ almost matches that of case carburized wrought alloyed steel rollers.