The Role of Shot Peening in Increasing X70 Steel Fatigue Properties

  • Katarina Mikova
  • Mario Guagliano
  • Otakar Bokuvka
  • Libor Trsko
  • Frantisek Novy
Keywords: X70 steel; shot peening; fatigue properties

Abstract

The paper presents the authors’ results of experimental examination of pipeline steel X70 fatigue properties before and after shot peening application, including relaxation of residual stresses during rotating bendi ng fatigue loading (f 30 Hz, T 20 5 °C, R 1). The obtained results confirmed the positive effect of surface hardening realized by shot peening. The fatigue properties incl. fatigue limit were higher after shot peening and this effect was visibly higher for notched specimens than for smooth specimens. During rotating bending fatigue loading the residual stresses in subsurface layers relaxes which decreases the strengthening effect after a certain number of cycles.

Author Biographies

Katarina Mikova

Department of Materials Engineering, Faculty of Mechanical Engineering, University of Zilina, Slovakia

Mario Guagliano

Department of Mechanics, Politecnico di Milano, Milano, Italy

Otakar Bokuvka

Department of Materials Engineering, Faculty of Mechanical Engineering, University of Zilina, Slovakia

Libor Trsko

Department of Materials Engineering, Faculty of Mechanical Engineering, University of Zilina, Slovakia

Frantisek Novy

Department of Materials Engineering, Faculty of Mechanical Engineering, University of Zilina, Slovakia

Published
2012-12-31
How to Cite
Mikova, K., Guagliano, M., Bokuvka, O., Trsko, L., & Novy, F. (2012). The Role of Shot Peening in Increasing X70 Steel Fatigue Properties. Communications - Scientific Letters of the University of Zilina, 14(4), 94-98. Retrieved from http://journals.uniza.sk/index.php/communications/article/view/781
Issue
Vol 14 No 4 (2012)
Section
Articles