Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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The Effects of VAR Processing Parameters on solidification Microstructures in Ti Alloys by Computer Simulation

열전달 해석을 이용한 VAR 공정 변수가 티타늄 합금 잉고트 응고 조직에 미치는 영향 연구

  • Kim, Jong-Hwan (Dept.of Metallurgy and Materials Science, Changwon National University) ;
  • Lee, Jae-Hyeon (Dept.of Metallurgy and Materials Science, Changwon National University) ;
  • Heo, Seong-Gang (Dept.of Metallurgy and Materials Science, Changwon National University) ;
  • Hyeon, Yong-Taek (Korea Institute of Machinery and Materials) ;
  • Lee, Yong-Tae (Korea Institute of Machinery and Materials)
  • 김종환 (창원대학교 금속재료공학과) ;
  • 이재현 (창원대학교 금속재료공학과) ;
  • 허성강 (창원대학교 금속재료공학과) ;
  • 현용택 (한국기계연구원 재료공정연구부) ;
  • 이용태 (한국기계연구원 재료공정연구부)
  • Published : 2002.05.01
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Abstract

VAR process is required to control its various operating parameters. Heat transfer simulation has been accomplished to understand development of solidification micro and macro-structures during VAR process in Ti alloys. Optimum VAR process parameters could be also estimated in this study. It was found that macro-structures were closely related to the shape and depth of liquid pool, and solidification parameters, such as temperature gradient, heat flux, solid fraction. The cooling rates were higher at bottom, top, and center part respectively. As cooling rates increased, the $\alpha$ phase decreased in length, width and fraction. In order to evaluate which parameter affects the result of heat transfer calculation most sensitively, the sensitivities of input parameters to the simulation result were examined. The pool depth and cooling rate showed more sensitive to the temperature of the molten metal, heat transfer coefficient, and liquidus respectively. Also, these thermal properties became more sensitive at higher temperatures.

Keywords

References

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