Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Process Design of Isothermal Forging for Three-Dimensional Ti-6Al-4V Wing-Shape

Ti-6Al-4V 합금 3D 날개형상의 항온단조 공정설계

  • 염종택 (한국기계연구원 공정연구부) ;
  • 박노광 (한국기계연구원 공정연구부) ;
  • 이유환 (포항공과대학교 신소재공학과) ;
  • 신태진 (포항공과대학교 기계공학과) ;
  • 홍성석 (국방과학연구소 기술연구본부) ;
  • 심인옥 (국방과학연구소 기술연구본부) ;
  • 황상무 (포항공과대학교 기계공학과) ;
  • 이종수 (포항공과대학교 신소재공학과)
  • Published : 2005.04.01
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Abstract

The isothermal forging design of a Ti-6Al-4V wing shape was performed by 3D FE simulation. The design focuses on near-net shape forming by the single stage. The process variables such as the die design, pre-form shape and size, ram speed and forging temperature were investigated. The main design priorities were to minimize forging loads and to distribute strain uniformly in a given forging condition. The FE simulation results for the final process design were compared with the isothermal forging tests. The instability of deformation was evaluated using a processing map based on the dynamic materials model(DMM), including flow stability criteria. Finally, a modified process design for producing a uniform Ti-6Al-4V wing product without forming defects was suggested.

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References

  1. 박노광, 1992, Ti 합금 정밀성형, 기계와 재료, 제 4 권, 제 2 호, pp. 103-114
  2. Y. S. Na, J.T. Yeom, N. K. Park, J. Y. Lee, 2003, Prediction of microstructure evolution during high temperature blade forging of a Ni-Fe based superalloy, Alloy 718, Metals and Materials Int., Vol. 9(1), pp. 15-19 https://doi.org/10.1007/BF03027224
  3. G. K. Turnbull, 1982, Titanium and Titanium alloySource Book, ASM, p. 265
  4. 염종택, 임정숙, 박노광, 2003, Ti-6AI-4V 합금의 열간성형에 대한 계면열전달계수의 결정 및 분석, 한국소성가공학회지, 제 12 권, 제 4 호, pp.370-375
  5. N. K. Park, J. T. Yeom, Y. S. Na, 2002, Characterization of deformation stability in hot forging of conventional Ti-6AI-4V using processing maps, J. Mater. Process Technol., Vol. 130-131, pp.540-545 https://doi.org/10.1016/S0924-0136(02)00801-4
  6. 염종택, 심인규, 박노광, 홍성석, 심인옥, 2003, 동적재료모델을 활용한 열간 후방압출된 Ti64 튜브의 성형결함 해석, 한국소성가공학회지, 제 12 권, 제 6 호, ,pp. 566-571
  7. 염종택, 박노광, 이유환, 신태진, 황상무, 홍성석, 심인옥, 이종수, 2004, Ti-6AI-4V 합금의 열간 후방압출에 대한 성형 안정성평가모델의 고찰, 한국군사과학기술학회지, 제 7 권, 제 3 호 (통권 제 18 호), pp. 84-92
  8. Y. V. R. K. Prasad, H. L. Gegel, S. M. Doraivelu, J. C. Malas, J. T. Morgan, K. A. Lark, D. R. Barker, 1984, Modelling of dynamic material behavior in hot deformation : Forging of Ti-6242, Metall. Trans., 15A, pp.1883-1892
  9. H. Ziegler, 1965, Some extremum principles in irreversible thermodynamics with application to continuum mechanics, in Prog. Solid Mech., I.N. Sneddon, and R. Hill(eds.), Vol. 4, Wiley, New York, p. 93
  10. J. C. Malas, V. Seetharaman, 1992, Using material behavior models to develop process control strategies, JOM, 44, pp. 8-13