Author(s)

S. Kocanda, D. Natkaniec & L. Sniezek

Abstract

Fatigue behaviour of laser hardened steel-comparison study for low, medium carbon steels, high strength and carburized CrMn steels S. Kocanda," D. Natkaniec,* L. Sniezek" " Polish Academy of Sciences, Department of Mechanical Engineering, Military University of Technology, 00-908 Warsaw, Poland * Department of Mechanical Engineering and Robotics, Academy of Mining and Metallurgy, 30-059 Krakow, Poland ABSTRACT Fatigue strength and fatigue crack growth in laser hardened specimens made of 0.2% C and 0.45% C carbon steels, high strength steel and carburized CrMn steel subjected to reversed bending were studied. Fatigue life of laser hardened specimens was two-four times greater than in the case of non-hardened samples of steels mentioned above. Fatigue crack growth al- tered irregularly depending on structure, geometry of surface laser tracks and residual stresses. The mechanism of fracture was established by frac- tographic analysis of fracture surfaces. INTRODUCTION S

Keywords