327 Wear Resistance of Alloy Tool Steel Surface-Modified by Quenching/Aluminum Film Deposition/Diffusion/Nitriding

Abstract

It is known that a very hard nitride layer may be formed by nitriding low-alloy tool steel containing forming elements such as chromium and aluminum. The hard layer on the steel surface is formed by depositing thin aluminum film on the steel, diffusing aluminum into the steel, and nitriding. However, significant thermal deformations are formed on the specimen surface by performing this process. Therefore a method which achieves quenching, tempering, and shape correction was attempted before the abovementioned process. We examined the wear characteristics for surface modified alloy tool steel made by use of the above processes with varying aluminum film thickness. Excellent resistances to the abrasive wear at an aluminum film thickness of 2.0μm and to the adhesive wear at aluminum film thickness of 1.5 to 1.6μm are obtained.