Improving the Mechanical Properties and Wear Resistance of a Commercial Pearlitic Rail Steel Using a Two-Step Heat Treatment

Microstructural evolutions and impact toughness in simulated welding heat affected zones for a high-strength carbide-free bainitic rail steel

“…The tensile and impact properties listed in Table 1 was tested base on TB/T 2344-2020 at ambient temperature (25 • C). The specimens for impact (10 × 10 × 55 mm 3 ) and dilatometer (Φ4 × 10 mm 2 ) tests were sampled within 15 mm from rail head tread, located within the hardened layer (~30 mm) of rail head.…”

“…At present, the rail materials are mainly eutectoid and hypereutectoid steels consisting of a dominant pearlitic structure. With the aid of microalloying [1], heat treatment [2,3] and thermal mechanical control processing (TMCP) technology [4], the ultimate tensile strength (UTS) of premium pearlitic rail has exceeded 1450 MPa [5]. Nonetheless, for the pearlitic rails it is significantly difficult to further improve the service performance to meet the harsh conditions by means of the methods above.…”

Influência da microestrutura antes e depois da soldagem de topo por centelhamento de trilhos ferroviários: uma abordagem de fadiga de contato de rolamento, transformações de fases e simulação por elementos finitos.

“…A temperatura inicial da transformação martensítica (Ms) para o ensaio dilatométrico com uma taxa de aquecimento de 10 °C/s mostrou uma temperatura de 198 °C. Os resultados observados por Masoumi et al[166] apresentaram resultados próximos a Ms de 196 °C. O modelo empírico de Kunitake[156] foi o mais relativo ao valor observado, mas com uma diferença de aproximadamente 5%.…”