Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of δ-Ferrite on the Hot Workability and Surface Defect of STS 304 Billets Containing 3 wt. % Cu

3 wt.% Cu 함유 STS 304 빌렛의 열간가공성과 표면결합에 미치는 δ-ferrite의 영향

  • Kim, S.W. (New Materials & Components Research Center, Research Institute of Industrial Science & Technology (RIST))
  • 김상원 (포항산업과학연구원 부품신소재연구센터 신금속연구팀)
  • Published : 2004.06.01
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Abstract

To investigate the effect of D-ferrite on the hot workability and surface defect of STS 304 billets containing 3 wt. % Cu, microstructure observations and high temperature mechanical properties test were carried out for the specimens extracted mainly from raw or oxidized billets. It was found that the total $\delta$-ferrite content has little influence on the hot workability, even though the fracture cracks due to high temperature tension or compression test were initiated and propagated mostly along $\delta$/${\gamma}$ boundary in the specimens. On the other hand, it was supposed that the direct causes of surface defects in the wire rolled from the as-continuously cast billet were the grain boundary embrittlement arose from the deep diffusion of oxygen into the grain boundary, and the oxidation of $\delta$-ferrite connected by a grain boundary to the surface during the billet reheating process as well.

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