THERMOCHEMICAL TREATMENT METHOD COMPRISING A SINGLE NITRIDING PHASE BEFORE CARBURISING

摘要

A method for thermochemically treating steel parts to improve the mechanical properties of same, comprising the diffusion of carbon by carburising and of nitrogen by nitriding in a low pressure furnace following a temperature cycle, characterised in that it first comprises an increase to a first relatively low temperature (T1) at which it is possible to start nitriding the metal, then a single nitriding phase (N) at a temperature between said first temperature (T1) and a second carburising temperature (T2), then a single carburising phase (C), followed by diffusion (D) at said second temperature (T2) which remains constant, and finally the phase of quenching (T) the metal.