Influence of the microstructure on the rolling contact fatigue of rail steel: Spheroidized pearlite and fully pearlitic microstructure analysis

Investigation of the heat energy and multi‐level load on subsurface fatigue damage evolution via multi‐scale method

“…Dislocation movement resistance (τ f ) of materials during loading and unloading. At the subsurface layer of parts, the accumulation of damage strain energy is shown in Equation (4). In the sub-surface layer of parts, the stress cycles required for crack initiation are calculated as shown in Equation ( 5):…”

“…Rolling contact fatigue widely exists in rail transit, aerospace, steel rolling and other fields 1–3 . With the development of modern industry, more and more important components are used in harsh environments such as high temperature, high pressure and high speed 4,5 . Under the action of different cycle load stress, fatigue crack initiation occurs in the parts, and the material properties of the parts change, which greatly reduces the service life of the parts and the reliability of the system operation at elevated temperature.…”

“…[1][2][3] With the development of modern industry, more and more important components are used in harsh environments such as high temperature, high pressure and high speed. 4,5 Under the action of different cycle load stress, fatigue crack initiation occurs in the parts, and the material properties of the parts change, which greatly reduces the service life of the parts and the reliability of the system operation at elevated temperature. It is of great engineering significance to study the influence of thermal energy on fatigue damage under high temperature environment and establish the prediction model of rolling fatigue damage life considering thermal energy effect.…”

Strengthening Mechanisms of Rail Steel under Compression

“…Knowledge of the formation patterns of the structural-phase states and properties of pearlite steel during plastic deformation is necessary to control the process of the deformation behaviour. The importance of the information in this field is determined by the depth of fundamental problems in physical materials science, on the one hand, and the practical significance of the problem, on the other hand, since the rails are made of pearlitic steel [8][9][10][11][12][13][14][15][16][17][18][19].…”

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.

“…Mesmo que o contra-disco seja mais duro que o disco, há uma maior tendência à trinca e perda de massa. Pereira et al [119] também observaram este comportamento: mesmo ao testar com contra-discos perlíticos contra com cementita esferoidizada com menor dureza, os contra-discos apresentavam uma tendência maior de nucleação e propagação de trincas. Para ensaios com discos da mesma microestrutura, a maior perda de massa foi encontrada nos contra-discos.…”