Abstract
The present study aims to develop an algorithm able to predict the fatigue lifetime of nitrided steels. Linear multi-axial fatigue criteria are used to take into account the gradients of mechanical properties provided by the nitriding process. Simulations on rotating bending fatigue specimens are made in order to test the nitrided surfaces. The fatigue model is applied to the cyclic loading of a gear from a simulation using the finite element software Ansys. Results show the positive contributions of nitriding on the fatigue strength. KEYWORDS. Nitriding; Fatigue; Lifetime.
Highlights
Fatigue resistance and mechanical capacity of aircraft engine components are of vital importance in aerospace industries
The present study aims to develop an algorithm able to predict the fatigue lifetime of nitrided steels
The criteria like Dang Van and Crossland allowed to take into account the mechanical improvements provided by nitriding
Summary
Fatigue resistance and mechanical capacity of aircraft engine components are of vital importance in aerospace industries. Due to the supply of nitrogen and its co-diffusion with carbon, precipitation of nanometric alloying elements nitrides and cementite at grain boundaries occurs leading to an increase of superficial hardness and providing compressive residual stresses in the surface layers [1,2,3,4]. The present work aims of creating a model for calculating fatigue lifetime of a nitrided layer whilst taking into account of mechanical improvements generated by nitriding. Based on previous works [5], the model takes into consideration the gradient of microstructure from the diffusion of carbon and nitrogen during nitriding and calculates the resulting gradient of compressive residual stresses from the volume change accompanying the precipitation. The work is conducted on gears designed by Hispano-Suiza, a company of the SAFRAN Group
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