Shape Evolution of Pinholes in Bloom with Multi-Scale Finite Element Technique

Il Heon Son; Kyung Hoon Lee

doi:10.4028/www.scientific.net/AMR.445.45

Paper Titles

Multiobjective Optimization of Milling Tool Geometry for Chatter Suppression and Productivity Improvement
p.21

A Case Study on Quality and Productivity Optimization in Electric Discharge Machining (EDM)
p.27

Experimental Investigation of the Rubber-Filled Tubes in the Tube Inversion Process
p.33

Investigation of Weld Line Movement in Tailor Welded Blank Forming
p.39

Shape Evolution of Pinholes in Bloom with Multi-Scale Finite Element Technique
p.45

Mathematical Modeling of Cutting Force in Milling of Medium Density Fibreboard Using Response Surface Method
p.51

A Slip-Line Approach to the Micro-Cutting Process with a Rounded-Edge Tool
p.56

Micro-Milling of Hardened AISI D2 Tool Steel
p.62

Bending Effect on Cutting Characteristics of Polycarbonate Thick Sheet Subjected to Indentation of Heightwise-Asymmetric Wedge Blades
p.68

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 445Shape Evolution of Pinholes in Bloom with...

Shape Evolution of Pinholes in Bloom with Multi-Scale Finite Element Technique

Abstract:

This study investigates the shape evolution of the pinholes on the bloom surfaces, which are originated from the continuous casting process, during multi-pass hot bar rolling. It is important to track the shape evolution of the pinholes since they can be formed as the sharp surface cracks after hot bar rolling and can initiate the surface bursts in the cold forging process. It is very hard to track the deformation behavior of the pinholes with detection tools during hot rolling, so the numerical simulations can be properly utilized. In general, the size of the pinholes in the bloom surface is order of micrometer although the bloom size is order of millimeter. This size discrepancy between them makes it difficult to discretize the domain including the pinholes for the finite element (FE) simulations. To overcome this limitation of the conventional FE simulation, multi-scale technique coupling the macro and micro models was developed in current study. This technique was implemented into the commercial simulation code, DEFORM-3D. The developed multi-scale simulation technique was capable of simulating the shape evolution of the pinholes through multi-pass hot bar rolling successfully. It is concluded that aspect ratio of the initial pinhole should be larger than 2.0 approximately to prevent it folded.