Duplex Hardening of Steels for Aeroengine Bearings

Duplex Hardening of Steels for Aeroengine Bearings

Duplex hardening is a process in which conventional heat-treatments such as secondary or case hardening are followed up by surface nitriding to achieve exceptional properties, particularly in the context of aeroengine bearings. Hardness values in excess of 1 000 HV can in principle be achieved, and although the hardness decreases as a function of depth below the surface, some level of enhanceme...

Steels for Bearings

A casual metallurgist might be forgiven in believing that there are but a few basic types of steels used in the manufacture of some of the most technologically important engineering components, the rolling bearings. First the famous 1C–1.5Cr steel from which the majority of bearings are made. Its structure is apparently well–understood and the focus is on purity in order to avoid inclusions whi...

Super Plasticity of /α Duplex Stainless Steels

In this paper the studies of the two-phase super Plasticity stainless steels is studied. The aim of this study obtained the suitable criteria to thermo-mechanical treatment condition for decrease the microstructure (grain size) and super plasticity property in two-phase stainless steels. Also here we want to show the appropriate ranges of temperature and strain rate used in the process super pl...

Secondary Hardening Behavior in Super Duplex Stainless Steels during LCF in Dynamic Strain Ageing Regime

Cyclic deformation behaviors in five modified duplex and 350°C. The influence of temperature and ni phenomenon, in the stress response curve was focuse dynamic strain ageing by increasing the first hardeni Furthermore, an increase in nitrogen concentration in ageing temperature range. The occurrence of strai structures. The formation of irreversible dislocation s hardening in the stress respons...

Secondary Hardening in High Speed Steels