Original Article

Fatigue life prediction of the nitrided steel by multiaxial high cycle fatigue criteria

¹ Laboratory of Mechanics, Materials and Processes (LMMP), National High School of Engineering of Tunis (ENSIT) – University of Tunis. 5, Avenue Taha Hussein, Montfleury 1008 Tunis, Tunisia
² Higher Institute of Applied Sciences and Technology of Sousse (ISSATSo), University of Sousse, Cité Taffala, Ibn Khaldoun 4003 Sousse, Tunisia

^* e-mail: abdelkarim.ghanem.isetrades@gmail.com

Received: 24 January 2024
Accepted: 27 May 2024

Abstract

The present study aims to predict the fatigue strength of ion-nitrided 42CrMo4 steel, using multiaxial high cycle fatigue (HCF) criteria and considering the effects of stabilized residual stresses and surface hardening. The predicted fatigue strength was compared to experimental data obtained after three-points bending fatigue tests at two stress ratios (0.1 and 0.5) and for notched (Kt = 1.6) nitrided and untreated specimens. A 3D finite element (FE) model of a three-point bending fatigue test was developed under ABAQUS software in order to determine the actual applied cyclic stress state at the notch. The results show that ion-nitriding treatment led to 32% improvement in the fatigue strength at 10⁶ cycles compared to the untreated material. This improvement is explained by the advantageous effect of ion-nitriding treatment in terms of compressive residual stresses and surface layer hardening. Both stabilized residual stress state and hardening effects were successfully implemented into various multi-axial HCF criteria, including Sines, Crossland, Dang Van and Matake criteria. A sensitivity analysis has shown that Crossland criterion has permitted to predict the fatigue limits in accordance with the experimental results.