Abstract:
This study delves into the formulation of an advancedmicrostructure in medium-carbon high silicon spring steel through a series of engineered heat treatments. The microstructure, composed of lower bainite, proeutectoid ferrite, and pearlite, exhibits superior mechanical properties compared to traditional pearlitic steel. Specifically, the novelmicrostructure yields a strength of 870 MPa and an ultimate tensile strength of 1050 MPa, along with an enhanced total elongation of 9.75 %, while the pearlitic steel achieved a yield strength of 745 MPa, an ultimate tensile strength of 845 MPa, and a total elongation of 9.0 %. The steel’s heightened strength is attributed to dislocation and precipitation strengthening, with the proeutectoid ferrite at grain boundaries contributing to the excellent elongation. The study thus establishes a ground breaking and readily implementable heat treatment process that significantly boosts the performance and longevity of heavy-haul rail system, owing to the synergistic contribution of lower bainite, proeutectoid ferrite, and pearlite in the microstructure.
Referência:
CENTENO, Dany Michell Andrade; TRESSIA, Gustavo; CARVALHO, Felipe Moreno; CEZARIO, Fabiano Eduardo Marques; ARIZA, Edwan Anderson; MASOUMI, Mohammad. Enchancing mechanical properties and wear resistance of heavy-haul systems through complex microstructure control. Journal of Materials Research and Technology, v.27, p.1146-1159, 2023.
Acesso ao artigo no site do Periódico:
https://www.sciencedirect.com/science/article/pii/S2238785423024535?via%3Dihub
