Evolution of microstructure, temperature and stress in a high speed steel work roll during hot rolling: Experiment and modelling

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

“…cyclically heated during contact with hot strips (due to conduction of heat from strip, deformation and friction works) and cooled by cooling systems, and the fast temperature variations leads to the development of oxide scale, thermal cracks and fatigue at work roll surface [1][2][3][4]. Hence, understanding and improvement of the work roll performances in service have been a very important subject for both engineers and scientists.…”

“…However, it has been found that very limited reports on temperature analysis of HSS work rolls were available after a careful literatures review. Only two reports [4,30] have been conducted based on practical industrial steel hot rolling process.…”

Evaluation of Thermal Breakage in Bimetallic Work Roll Considering Heat Treated Residual Stress Combined with Thermal Stress during Hot Rolling

“…The excessive combined compressive stress can be explained in the following two aspects. For one thing, the heat treated compressive residual stress considered in this study has not been taken into consideration in the ref . If without considering the heated residual stress, the initial stress would be 0 at the start of the hot rolling.…”

“…It should be noted that the heat generated by strip deformation and the mechanical loads are not taken into account in this paper. Further, to shorten the computational effort and save time, work roll rotation has been simulated by fixed roll and rotating thermal loadings on its boundary . In fact, the hot rolling parameters strongly influence work roll temperature, including initial temperature of work roll and hot strip, material properties of work roll and hot strip, the nozzle spraying cooling condition (such as nozzle pressure, nozzle flow, nozzle position, and angle even the distance from work roll surface), the oxidation layer, and so on .…”

Mechanisms of Oxidation Degradation of Cr12 Roller Steel during Thermal Fatigue Tests

“…High manufacturing costs make any attempts to increase the operating time of the rolls and improve the surface quality of the rolled products enticing [2][3][4]. The oxidation process of rolls has a strong influence on the complex degradation process of the roll surface layer [4][5][6][7][8][9][10][11][12][13]. The degradation of the roller surface is related to the microstructure, the temperature and the thermal stresses acting on it.…”