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Three-Dimensional Microstructural Modelling of Wear, Crack Initiation and Growth in Rail Steel
Fletcher, D.I.,Franklin, F.J.,Garnham, J.E.,Muyupa, E.,Papaelias, M.,Davis, C.L.,Kapoor, A.,Widiyarta, M.,Vasic, G. The Korean Society for Railway 2008 International Journal of Railway Vol.1 No.3
Rolling-sliding, cyclic contact of wheel and rail progressively alters the microstructure of the contacting steels, eventually leading to micro-scale crack initiation, wear and macro-scale crack growth in the railhead. Relating the microstructural changes to subsequent wear and cracking is being accomplished through modelling at three spatial scales: (i) bulk material (ii) multi-grain and (iii) sub-grain. The models incorporate detailed information from metallurgical examinations of used rails and tested rail material. The initial 2-dimensional models representing the rail material are being further developed into 3-dimensional models. Modelling is taking account of thermal effects, and traffic patterns to which the rails are exposed.