OUTSTANDING CASE HARDENING OF PYROWEAR ALLOY 53 WITH LPC

摘要

Pyrowear Alloy 53 steel is an excellent material for the construction of drive transmission components (gears, shafts, etc.) which have to operate in difficult conditions primarily in the aviation industry (Fig. 1.). Among the properties of such items is a high case hardness and abrasion-resistance, while the core remains flexible and is capable of carrying large impact loads. They can work at elevated temperatures with limited lubrication. The thermal treatment of such materials is based on case hardening by means of carburizing. This paper presents the technology of vacuum carburizing of Pyrowear Alloy 53 steel. It discusses the methods of establishing different profiles of carbon concentration in a layer and their influence on the hardness profile. The effects of sub-zero treatment and tempering on the properties of the hardened case are also considered. It also presents a SimVaC simulator of vacuum carburizing, designed especially for Pyrowear Alloy 53 steel, which provides highly accurate predictions of the outcome of the process as the profile of carbon concentration in the layer, or vice versa: establishes the process parameters which will guarantee the required profile.