Grain Boundary Bulging during Tempering in Lath-Martensitic Steel

Natori, Masahide; Tsuchiyama, Toshihiro; Takaki, Setsuo

doi:10.4028/www.scientific.net/msf.558-559.277

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The tensile strength of P5 is about 50 MPa lower than that of P15 in the same rail. For samples of P5, the residual internal stress may get decreased and carbon atoms diffuse out of the martensite when temperature increases after the spray controlled-cooling process completed, which may reduce the tensile strength of the samples [19].…”

Section: Resultsmentioning

confidence: 99%

Research on the Microstructures and Mechanical Properties of Bainite/Martensite Rail Treated by the Controlled-Cooling Process

et al. 2019

View full text Add to dashboard Cite

A bainite/martensite multiphase rail is treated by the controlled-cooling process with different finish-cooling temperatures. The simulated temperature–time curves of the position of 5 mm and 15 mm below the rail tread (P5 and P15) express different trends. P5 has greater impact toughness and lower tensile strength than P15. Microstructural characterization was carried out by conducting scanning electron microscopy, X-ray diffraction, electron backscatter diffraction, and transmission electron microscopy. The greater tensile strength is due to the dispersed ε-carbides hindering the movement of dislocations. The greater impact toughness is attributed to the filmy retained austenite and the smaller effective grain with high-angle boundary. Finite element modeling (FEM) and microstructural characterization reasonably explain the changes of mechanical properties. The present work provides experimental and theoretical guidance for the development of rail with excellent mechanical properties.

show abstract

Section: Resultsmentioning

confidence: 99%