Yang Quan

Destructive behavior of iron oxide in projectile impact

The damage strain values of Q235-A surface oxide scale were obtained by scanning electron microscopy (SEM/EDS) and universal tensile testing machine. The finite element simulation was carried out to study the destruction effects of oxidation at different impact rates. The results show that the damage value of the oxide strain is 0.08%. With the increase of the projectile velocity, the damage area of the oxide scale is increased, and the damage area is composed of the direct destruction area and the indirect failure area. The indirect damage area is caused by the stress/strain to the surrounding expansion after the impact of the steel body.

Multi-objective and satisfactory optimization design of backup roll chamfer parameters for hot strip mills

In the hot rolling production, in order to avoid or delay the invalidation of backup roll end, a chamfer transition is often designed at the end of backup roll. But the selection of specific parameters of backup roll chamfer for different width hot strip mills, which do not attract too much attention. In this paper, based on the comprehensive consideration of various factors including contact pressure between work roll and backup roll, and shape control capabilities, the multi-objective and satisfactory optimization model of backup roll chamfer parameters has been established, and optimized computing has been done with simulated annealing genetic algorithm for specific examples, This paper proposes a set of method on the design of backup roll chamfer for different width rolling mills, and provides a theoretical guidance for the practical application.