Author(s)

I. Cerny, V. Linhart & F. Hnilica

Abstract

Influence of changing of microstructure by the heat treatment on fatigue crack growth properties of the carbon cast steel I. Cerny, V. Linhart, F. Hnilica Department of Strength, National Research Institute for Materials, Opletalova 25, 113 12 Prague 1, Czech Republic ABSTRACT An influence of the surface heat treatment on the GSN 422660 carbon cast steel, which is equivalent to the German GS-60 steel (DIN 1681), with a various content of Al on fatigue crack growth rates and threshold va- lues of physically long cracks was studied. The microstructure is the most important factor, which determines the fatigue crack growth mechanism and re- sistance. Oxide debris on the crack faces reduce sig- nificantly the threshold values. INTRODUCTION The surface heat treatment is a widely used method in many engineering applications for an improving of mechanical properties of machine parts. An increase of the surface strength results in a better wear re- si

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