Development of a Rolling Process Design Tool for Use in Improving Hot Roll Slab Recovery (Quarterly Report: Q3-FY03)

Couch, R ; Wang, P

Lawrence Livermore National Laboratory

关键词: Fractures;    99 General And Miscellaneous//Mathematics, Computing, And Information Science;    Shape;    Strain Rate;    Parallel Processing;   

DOI  :  10.2172/15005026
RP-ID  :  UCRL-ID-139582-Q3-FY03
RP-ID  :  W-7405-ENG-48
RP-ID  :  15005026

美国|英语

来源: UNT Digital Library

【 摘 要 】

In this quarter, an FEM simulation has been performed to compare the shape of the deformed slab after the 8th reduction pass with the experimental metrology data provided by Alcoa Technical Center (ATC). Also, a bug in the thermal contact algorithm used in parallel processing have been identified and corrected for consistent thermal solutions between the rollers and the slab. The overall shape of the slab at the end of the 8th pass is shown in Figure 1. Comparison of the sectional views at the center plane along the length of the slab for both experiment and simulation, shows that the curvature at the slab mouth at the centerline is slightly higher than the experimental result as shown in Figure 2. We are currently focusing on tuning the parameter values used in the simulation and a more complete parametric study for validation is underway. Also, unexpected fracture occurred along the surface of the slab in the 9th pass as shown in Figure 3. We believe that the reason is due to previously noted inadequacies in the fracture model at low strain rates and high stress triaxiality. We are expecting to receive a modified fracture model based on additional experiment shortly from Alcoa.