Study for the Initiation Locations of Longitudinal Surface Cracks on Beam Blank in the Mould of Continuous Casting

摘要

During beam blank's continuous casting production, lots of longitudinal cracks easily appear on the surface. In order to study the initiation locations of longitudinal surface cracks in the mould, a coupled thermo-elasto-plastic finite element model was established to compute the temperature and stress on the software ABAQUS. A user subroutine DFLUX was used to simulate the heat transfer process and thermal field. The stress field under the influence of thermal stress, surface friction, ferrostatic pressure was analyzed by the mean of contact algorithm and restart scheme. According to the results, it can be inferred that the forming locations of longitudinal surface cracks easily appear on the surface of the fillet, the web center, the flange tip and the flange center. Moreover, initiation locations of longitudinal surface cracks should be: on fillet at a distance of 200 mm to the meniscus, and the other three sections at a distance of 180 mm to the meniscus.