Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Design of Hot Heading Process and Evaluation of Mechanical Properties of Alloy718 Coupling Bolt for Gas Turbine

가스터빈용 Alloy718 커플링볼트의 열간 헤딩 공정설계 및 기계적 특성 평가

  • 최홍석 (부산대학교 대학원 정밀가공시스템) ;
  • 이정민 (부산대학교 대학원 정밀가공시스템) ;
  • 고대철 (부산대학교 동남권부품소재 산학협력혁신연구소) ;
  • 이선봉 (계명대학교 공과대학 기계.자동차공학부) ;
  • 김병민 (부산대학교 기계공학부)
  • Published : 2008.06.01
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Abstract

Alloy718 is the nickel-base super alloy well used as gas turbine components under severe operating conditions because of its high strength at high temperature and excellent creep resistance. In this study, a coupling bolt for the gas turbine component is manufactured by hot heading process instead of whole machining in order to improve the mechanical properties. Die shape for the hot heading has been designed by general design rule of hot forging and also optimal process condition has been investigated by finite element method. The initial billet temperature and the punch speed have been determined by $1150^{\circ}C$ and 600mm/s on the basis of finite element analysis, respectively. The coupling bolt has been manufactured by 200ton screw press and evaluated by experiment in order to investigate the mechanical properties. As a result of experiment, the mechanical properties such as hardness, tensile strength and creep behavior have been superior to those manufactured by machining.

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References

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