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Advances in Materials Science and Engineering
Volume 2016, Article ID 8952657, 6 pages
http://dx.doi.org/10.1155/2016/8952657
Research Article

A Fractographic Study of Bending/Torsion Fatigue Failure in Metallic Materials with Protective Surface Layers

1Central European Institute of Technology, Brno University of Technology, Technická 3058/10, 616 00 Brno, Czech Republic
2Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic
3Faculty of Industrial Technology, Alexander Dubček University in Trenčín, Ivana Krasku 491/30, 020 01 Púchov, Slovakia

Received 9 March 2016; Revised 10 May 2016; Accepted 18 May 2016

Academic Editor: Gianfranco Palumbo

Copyright © 2016 Karel Slámečka et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Results are given of a fractographic study of biaxial in-phase bending/torsion fatigue fractures in specimens made of nitrided steel and nickel-based superalloy with protective coatings (diffusion coatings and plasma-sprayed thermal barrier coatings). Fracture surfaces were examined by optical and scanning electron microscopes while stereophotogrammetry and optical profilometry were employed to obtain 3D surface data of selected fracture surface regions. The studied materials exhibited a wide range of fracture mechanisms depending on the microstructure and applied mechanical loading.