The effects of inclusions on rail life cannot be evaluated as an isolated parameter or be viewed as a comprehensive effect phenomenon. Inclusion effects must be considered as part of a set of interactive rail properties and the rails' service use conditions. Any understanding of how inclusions control rail life, and any understanding of why inclusions must be better controlled in the future must consider the effects of rails' active use profiles and their primary hardnesses. Rail profiles are continously modified by wheel/train wear processes and particularly by the rails' plastic deformation response to wheel overload stressing. Railroads attempt to control their rails' profiles by maintenance grinding. The active profiles of the rails control where wheels will run on those rails, and the rail profiles' wheel guidance capabilities determine the locations and extents of the interfacial contact pressures and the wheel sliding reactions on the rails. Rails' hardnesses determine their relative resistances to deformation under wheel loading. Hardness, or resistance to deformation under load, has great influence on how the non-metallic inclusions in any rail will affect subsequent wear reactions, and more importantly, how the inclusions in the rail will affect crack initiation and crack propagation mechanisms.
The effects of non-metallic inclusions on the durability of rail in heavy-haul service
Einfluß von nichtmetallischen Einschlüssen auf die Lebensdauer von Eisenbahnschienen im Schwerfrachtverkehr
1993
4 Seiten, 3 Bilder
Aufsatz (Konferenz)
Englisch
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