Contact Rolling Fatigue Of Rail Steels
Author(s)
S. Nishida, N. Hattori & T. Miyake
Abstract
The authors have focused on the \“dark spots”, which are initiated from white
phase due to the contact between wheel and rail, especially in the Shinkansen
track. Most of these defects have been initiated on the high-speed rail track at
more than 150 km/h and in the accelerated train’s section. Though the
dominating factors for the dark spot’s initiation have not necessarily been
clarified yet, it has been observed that the white phase exists and the contact
rolling fatigue cracks are propagated through the white phase. As the white phase
consists of 90% martensite and 10% residual austenite, it is very brittle and the
contact rolling fatigue cracks are easily initiated due to cyclic loading. Therefore,
it is considered that this white phase would be one of the causes for generating
the contact rolling cracks in Shinkansen rails. The object of this study is to
investigate the mechanism of contact rolling fatigue defects in view of the
initiation mechanism of dark spot, which is also known as the shelling defect.
The authors considered that the initiation of the contact rolling defects relates to
Hertizn stress, lubrication, tangential forces etc. The main results obtained in this
study are as follows: (1) The white phase would be generated due to the alternate
conditions between water lubrication and dryness. (2) The tangential force
affects the contact rolling fatigue crack initiation and propagation properties. (3)
White phase has been generated at an early stage according to the observation
results of the contact rolling fatigue mechanism.
Keywords: contact rolling fatigue, rail steels, white phase, shelling, fatigue
crack, lubrication, Hertzian stress.
1 Introduction
As far as the surface defects in the running rail head, there are mainly two kinds
of defects called the \“head checks” and \“dark spots (or shelling defects)” in the
Keywords
contact rolling fatigue, rail steels, white phase, shelling, fatigue
crack, lubrication, Hertzian stress.
Related Book
Other papers in this volume
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