Hardening mechanism of Cr5 backup roll material induced by rolling contact fatigue

Investigation on influence of WC–Ni addition on rolling contact fatigue behavior of plasma sprayed Ni-based alloy coating

“…The surfaces of many key components are suffering from a permanent damage process under long-term pure rolling or rolling/ sliding contact, which may lead to rolling contact fatigue (RCF) or wear failure [1][2][3][4][5]. Undoubtedly, the RCF would reduce the life and reliability of many useful components, such as gears, rolling bearings, and railways [6][7][8].…”

Theoretical and experimental investigation of thermal and oxidation behaviours of a high speed steel work roll during hot rolling

“…Physical and mechanical properties of the work roll and back-up roll used in the FE models in this study[2,5,21,30,50,51].…”

Influence of Work Hardening on the Surface of Backup Rolls for a 4-High Rolling Mill Fractured during Rolling Campaign

“…With the application of mechanical tests, we could determine that hardness was affected in the radial direction, reaching values of 580 HV at 1.4 mm depth, which was confirmed with images of the dark etching region and white etching bands, such as is described by some researchers that have studied the alterations of areas exposed to mechanical contact in bearings and other mechanical components [ 16 , 17 , 18 , 19 , 20 , 21 ], as well as the metallurgical change in microstructures, increasing the size and quantity of carbides. These parameters exhibit the presence of work hardening due to contact fatigue rolling, according to a hardening mechanism induced by rolling contact described by Qin et al [ 13 ], creating the beginning of a surface crack on the fatigue zone of a BUR, growing along the fatigued material by fragile fracture, and finishing with a spalling in the main radius located in the union of the barrel with the neck of the operation side, according to a morphology analysis, supported and confirmed by the FEM simulation using the ANSYS Mechanical Static Structural Software, where we can observe two points of stress concentration located on the end of barrel length and the main radius, which are the beginning and end of the crack, respectively. Additionally, the BURs work at 100–175 RPM for 28 days (22 h per day), resulting in approximately 3.7 × 10 6 to 6.5 × 10 6 cycles.…”

“…Qin et al [ 13 ] used two rings of forged steel Cr5 to study the hardening mechanism on zones with high rolling contact fatigue. Choudhary et al [ 14 ] studied the relationship between tensile stress–strain and work hardening behavior, describing that there are variations in work-hardening parameters with temperature and strain rates.…”