The problem of ensuring the reliability and fatigue life of rolling stock is becoming ever more urgent with increase of transportation volume and traffic intensity of railway transport. It is the most acute for basic parts and mechanisms of bogies of carriages and locomotives, the main part of which is the wheel, directly contacting the rail. Wheel tread wears in service. Flange inner surface is prone to considerable wear that is determined by service conditions of frictionrolling wheel-rail pair. Reconditioning of worn wheel tread is performed in specialized repair plants of railway transport by the method of mechanical turning, or by first performing repair cladding of flange surface. Railway wheels of freight transport, locomotive wheel flanges, flanges of tram wheels of passenger transport are made of high-strength carbon steels, the composition and mechanical properties of which are given. As is seen, wheel steels feature high strength and hardness. Such metal properties ensure the required level of service strength of wheels. Flanges and all-rolled wheels from steel 2 are the most widely applied in railway transport of Ukraine and CIS countries. In keeping with GOST 10791-89, carbon content in wheel steel 2 is equal to 0.55-0.65 %. Experimental data are given on the effect of composition of cladding consumables on formation of structure and mechanical properties of the deposited metal on wheels of steel 2. Strength properties, ductility and crack resistance of railway wheels repaired by cladding, were evaluated by analytical methods. It was found that to ensure the required combination of mechanical properties and high crack resistance of the base and deposited metals it is rational to apply cladding consumables of bainitic or bainitic-martensitic grade for repair of railway wheels of steel 2 by arc cladding. The conclusions are: (1) Required set of mechanical properties of the deposited metal at reconditioning of worn surfaces of railway wheels (hardness HB ≥ 2500, strength σt ≥ 700 MPa) can be ensured by cladding consumables of bainite or bainite-martensite classes, namely solid wires Sv-08KhM, Sv-08KhMF and flux-cored wire PP-AN180MN. (2) Metal, deposited with flux-cored wire PP-AN180MN, combines high strength, hardness and crack resistance. All the regions of welded joints, made with this wire, have homogeneous finely-dispersed bainite-martensite structure with uniform distribution of local internal stresses.


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    Titel :

    Influence of deposited metal composition on structure and mechanical properties of reconditioned railway wheels


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2012


    Format / Umfang :

    7 Seiten, 7 Bilder, 4 Tabellen, 5 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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