Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Selective Surface Oxidation of 590MPa TRIP Steel and Its Effect on Hot-Dip Galvanizability

590 MPa TRIP강의 선택적 표면산화 거동과 표면 산화막이 도금특성에 미치는 영향

  • Kim, Seong-Hwan (Department of Materials Science & Engineering, Korea University) ;
  • Im, Jun-Mo (Department of Materials Science & Engineering, Korea University) ;
  • Huh, Joo-Youl (Department of Materials Science & Engineering, Korea University) ;
  • Lee, Suk-Kyu (POSCO Technical Research Laboratories) ;
  • Park, Rho-Bum (POSCO Technical Research Laboratories) ;
  • Kim, Jong-Sang (POSCO Technical Research Laboratories)
  • 김성환 (고려대학교 신소재공학부) ;
  • 임준모 (고려대학교 신소재공학부) ;
  • 허주열 (고려대학교 신소재공학부) ;
  • 이석규 (POSCO 기술연구원 표면처리연구그룹) ;
  • 박노범 (POSCO 기술연구원 표면처리연구그룹) ;
  • 김종상 (POSCO 기술연구원 표면처리연구그룹)
  • Received : 2011.01.27
  • Published : 2011.04.25
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Abstract

In order to gain better understanding of the selective surface oxidation and its influence on the galvanizability of a transformation-induced plasticity (TRIP) assisted steel containing 1.5 wt.% Si and 1.6 wt.% Mn, a model experiment has been carried out by depositing Si and Mn (each with a nominal thickness of 10 nm) in either monolayers or bilayers on a low-alloy interstitial-free (IF) steel sheet. After intercritical annealing at $800^{\circ}C$ in a $N_2$ ambient with a dew point of $-40^{\circ}C$, the surface scale formed on 590 MPa TRIP steel exhibited a microstructure similar to that of the scale formed on the Mn/Si bilayer-coated IF steel, consisting of $Mn_{2}SiO_{4}$ particles embedded in an amorphous $SiO_{2}$ film. The present study results indicated that, during the intercritical annealing process of 590 MPa TRIP steel, surface segregation of Si occurs first to form an amorphous $SiO_{2}$ film, which in turn accelerates the out-diffusion of Mn to form more stable Mn-Si oxide particles on the steel surface. During hot-dip galvanizing, particulate $Fe_{3}O_{4}$, MnO, and Si-Mn oxides were reduced more readily by Al in a Zn bath than the amorphous $SiO_{2}$ film. Therefore, in order to improve the galvanizability of 590 TRIP steel, it is most desirable to minimize the surface segregation of Si during the intercritical annealing process.

Keywords

Acknowledgement

Supported by : POSCO

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