Ferro-cerium and other pyrophoric alloys

Abstract

The running-in wear of a flake graphite grey cast iron in the untreated and laser-hardened conditions has been measured using a Talysurf with a precision relocation technique and the worn surface examined using scanning electron microscopy. For both types of iron wear was mainly abrasive, and no adhesive wear occured. With the untreated irons graphite was deposited on the wheel, wear continued with the higher load but reached a steady-state condition after about 100 m with the lower load, and wear followed approximately a truncation model. With the laser-hardened irons the amount of wear was reduced considerably, graphite was not deposited on the wheel, the profilometry data were irregular, and wear did not follow a truncation model. The microscopical and profilometry data are discussed in relation to the running-in process.