Abstract
This paper reports about possible concept in which surface damage of the rail after long tem cyclic loading can be executed. This study employs non destructive magnetic Barkhausen noise as a promising technique which exhibits very good sensitivity against extent of surface damage. Magnetic Barkhausen noise is correlated with the conventional parameters of surface integrity expressed in term of the thickness of damaged layer, its micro hardness as well as stress state. Furthermore, phase analysis of the real surface indicates that extensive phase transformations are produced by the repeated severe plastic deformation. Phase composition of the damaged layer indicates that structure transformation in the rail surface is thermally induced rather than deformation induced process
Highlights
Large axle loads of the trains usually cause serious wear and structure transformations of the rails
Thin and discontinuous white etching layer (WEL) can be found on the left side of the rail width whereas thick and continuous WEL is located at the distance 9 and especially 15 mm from the left side of the rail
Micro cracking in the hard and brittle WEL arises from the cyclic long term loading and potentially can initiate rail macro cracking
Summary
Large axle loads of the trains usually cause serious wear and structure transformations of the rails. Phase analyses reveal retained austenite which indicates that WEL is thermally initiated process when the near surface region undergoes heating above austenitizing temperature followed by rapid self - cooling [1 - 3 and 5]. Such process hinders full transformation of austenite to pearlite and certain volume of austenite retains in the WEL. WEL was subjected to many studies in which variable techniques were employed to identify stress state, phase composition, chemical and other alterations [1 - 5].
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