Finite element and experimental analysis of closure and contact bonding of pores during hot rolling of steel

Soo Hyun Joo, Jaimyun Jung, Myung Sik Chun, Chang Ho Moon, Sunghak Lee, Hyoung Seop Kim

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The closure and contact bonding behavior of internal pores in steel slabs during hot rolling was studied using experiments and the finite element method (FEM). Effects of pore size and shape were investigated, and three different cases of pore closure results were observed: no closure, partial closure, and full closure. The FEM results well reproduced various closure events. Bonding strengths of unsuccessfully closed pores, measured by tensile tests, showed critical effects. Also, there was a difference in bonding strengths of several fully closed pores. Fracture surfaces showed that welded regions could be divided into three (not, partially, and perfectly) welded regions. The pressure-time curves obtained from the FEM results indicate that pore surface contact time and deformed surface length are important parameters in pore welding. Pore size, pore shape, time of pressure contact, and deformed surface length should be considered to completely eliminate pores in final products.

Original languageEnglish
Pages (from-to)4002-4011
Number of pages10
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume45
Issue number9
DOIs
Publication statusPublished - 2014 Aug

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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