Advertisement

Influence of the Nitrided Layers Microstructure on the Fatigue Life Improvements of AISI 4140 Steel

  • Rafik BechouelEmail author
  • Nabil Laalai
  • Mohamed Ali Terres
Conference paper
  • 67 Downloads
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

Nitriding is an important industrial process to improve the mechanical properties of components, especially by producing compressive residual stresses. Gas and ion nitriding has become a popular thermo-chemical surface treatment, which is being used to develop thermal/mechanical fatigue and wear characteristics of steels. In this study, the gas and ion nitriding of AISI 4140 steel was carried. The micro-structure, the micro-hardness, the residual stresses distribution and the crack resistance of the hardened steel are determined. These analysis and characterization are carried out using optical microscopy, scanning electronic microscopy, X-ray diffraction and mechanical measurements (micro hardness and residual stresses) of treated material. The results are intended to contribute in defining and optimizing the adequate choice of treatments for this type of steel in industrial conditions. The gains, expressed in term of endurance limit, brought by these treatments are established by three-points bending fatigue tests and discussed in relation to the residual stresses evolution under the cyclic loading conditions. The fatigue fracture resistance is analyzed by methods of fracture mechanisms. This reveals that the gain provided by the gas nitriding (50%) is about 8% against 32% for the ion nitriding. This is primarily allotted to a high level of compressive residual stresses for ionic nitrided state compared to the gas nitrided state.

Keywords

Gas nitriding Ion nitriding Microstructure Compressive residual stresses Fatigue life AISI 4140 steel 

References

  1. 1.
    De la Cruz P, Odén M, Ericsson T (1998) Influence of plasma nitriding on fatigue strength and fracture of a B-Mn steel. Mater Sci Eng A 242:181–194CrossRefGoogle Scholar
  2. 2.
    Manisekaran T, Kamaraj M, Sharrif SM, Joshi SV (2007) Erosion studies on surface modified 13Cr–4Ni steels: effect of angle of impingement and particle size. JMEPEG 16:567–572CrossRefGoogle Scholar
  3. 3.
    Terres MA, Ben Mohamed S, Sidhom H (2010) Influence of ion nitriding on fatigue strength of low-alloy (42CrMo4) steel: experimental characterization and predictive approach. Int J Fatigue 9:42–56Google Scholar
  4. 4.
    Souza SD, Olzon-Dionysio M, Miola EJ, Paiva-Santos CO (2004) Plasma nitriding of sintered AISI 316L at several temperatures. Surf Coat Technol 84:176–181CrossRefGoogle Scholar
  5. 5.
    Gontijo LC, Machado R, Miola EJ, Casteletti LC (2004) Characterization of plasma-nitrided iron by XRD, SEM and XPS. Surf Coat Technol 183:10–17CrossRefGoogle Scholar
  6. 6.
    Terres MA, Sidhom H, Ben Cheikh Larbi A, Ouali I, Lieurade HP (2001) Influence de la nature de la couche de combinaison sur la résistance à la fatigue des composants nitrurés. Matériaux Techniques 9:42–56Google Scholar
  7. 7.
    Tokaji K, Ogawa T, Shibata H (1999) The effects of gas nitriding on fatigue behaviour in titanium alloys. J Mater Eng Perform 8:159–167CrossRefGoogle Scholar
  8. 8.
    Terres MA, Sidhom H (2010) Influence de la nitruration gazeuse sur la tenue en fatigue flexion des composants nitrurés en acier 42CrMo4. Matériaux Techniques 98:171–184CrossRefGoogle Scholar
  9. 9.
    Ribeiro KJB, deSousa RRM, deAraújo FO (2008) Industrial application of AISI 4340 steels treated in cathodic cage plasma nitriding technique. Mater Sci Eng A 479:142–147CrossRefGoogle Scholar
  10. 10.
    Ahangarani SH, Mahboubi F, Sabour AR (2006) Effects of various nitriding parameters on active screen plasma nitriding behavior of a low-alloy steel. Vacuum 80:1032–1037CrossRefGoogle Scholar
  11. 11.
    Celik A, Efeoglu I, Sakar G, Turkey E (2001) Microstructure and structural behaviour of ion-nitrided AISI 8620 steel. Mater Charact 46:39–44CrossRefGoogle Scholar
  12. 12.
    Terres MA, Bechouel R, Ben Mohamed S (2017) Low cycle fatigue behaviour of nitrided layer of 42CrMo4 steel. Int J Mater Sci Appl 6:18–27Google Scholar

Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Rafik Bechouel
    • 1
    • 2
    Email author
  • Nabil Laalai
    • 1
  • Mohamed Ali Terres
    • 1
  1. 1.Mechanical, Material and Processes Laboratory (LR99ES05), ENSITUniversity of TunisTunisTunisia
  2. 2.National Engineering School of Sousse, ENISOUniversity of SousseSousseTunisia

Personalised recommendations