Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2014 - zeszyt 2

Influence of hot rolling and isothermal annealing on microstructure and mechanical properties of high carbon steel

nr katalogowy: 84273

Railroads consist, among others, of rail tracks and turnouts. Railway turnouts are complex structures of railroad sections which either fork or join intersecting tracks (Fig. 1, 2). In a turnout, in the place where stretches of rails intersect each other, the so-called frogs are used. The frog allows a rail-vehicle to ride through rail intersections. It is constructed using block sections, type KL60 or KL49, produced via hot rolling. Turnouts are especially exposed to abrasive or fatigue wear and to changes of shape as a result of high dynamic loads of cyclic nature which occur when track vehicles ride through the turnout [1]. The process of a mechanic destruction of the upper layer leads to undesirable changes of the dimensions and shape of the contacting rolling surfaces of a turnout element and a railway wheel. Measurements of the wear of block sections built-in in turnout frogs made in operating conditions have shown irregularities in the wear of the rolling surface profile throughout the actual frog point length and its plastic flattening. The measurement methodology is presented in the authors' paper [1]. The highest wear occurs in the actual frog point in the place of the biggest load and decreases as the distance from the frog point grows. Such wear is caused by a momentary increase of the dynamic load acting on a small area of the frog point rolling surface, which leads to an intensive wear and plastic flattening of the frog point as a result of the rail vehicle wheel hitting against it. For these reasons, materials used for the production of rail turnout sections must have specific properties and first of all, an increased resistance to abrasive wear and fatigue. High costs of rail turnouts operation and their replacement are the grounds for developing new materials or technologies which will allow producing sections of better durability than those currently in use. Carbon-manganese steels of grade R260 with a[...]

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