Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Creep Behaviour of Solution Treated Alpha Titanium Alloy for Automotive Parts

자동차부품 소재개발을 위한 알파 티타늄 합금의 용체화 처리후 정적 크리프 거동

  • Hwang Kyungchoong (School of Mechanical and Automotive Engineering, Kyungil University) ;
  • Yoon Jongho (School of Mechanical and Automotive Engineering, Kyungil University)
  • 황경충 (경일대학교 기계자동차학부) ;
  • 윤종호 (경일대학교 기계자동차학부)
  • Published : 2005.01.01
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Abstract

Titanium alloy has widely been used as material for automotive parts because it has high specific strength. It is also light and harmless to human body. But, we have little design data about the creep behaviors of the alloy. Therefore, in this study, creep tests under four constant stress conditions have been conducted with low different temperature conditions. A series of creep tests had been performed to get the basic design data and life prediction of titanium products and we have gotten the fallowing results. First, the stress exponents decrease as the test temperatures increased. Secondly, the creep activation energy gradually decrease as the stresses became bigger. Thirdly, the constant of Larson-Miller parameter on this alloy was estimated as about 7.5. And for the last, the fractographs at the creep rupture showed the ductile fracture due to the intergranullar rupture.

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References

  1. K. C. Hwang and J. H. Yoon, 'Creep Behaviour of Al-Zn-Mg Ternary Aluminum Alloy,' Transactions of KSAE, Vol.12, No.1, pp.203-208, 2004
  2. G. S. Lee, The Creep Characteristics of Plasma Carburized Ti-6Al-4V Alloy, Graduate School of Chungbuk National Univ., Master Thesis, 2001
  3. L. J. Cuddy, 'Internal Stresses and Structures Developed During Creep,' Met. Trans., Vol.1, pp.395-401, 1970 https://doi.org/10.1007/BF02811548
  4. W. L. Bradley, S. W. Nam and D. K. Matlock, 'Fatigue Perturbed Creep of Pure Aluminum at Ambient Temperatures,' Met. Trans., Vol.7A, pp.425-430, 1976
  5. J. H. Dorn, The Mechanical Behaviour of Materials at Elevated Temperature, McGraw-Hill, New York, pp.432-443, 1961
  6. E. N. da C. Andrade, 'On the Viscous Flow in Metals and Allied Phenomena,' Proc. Roy. Soc., Series A, London, UK, Vol.84, pp.1-12, 1910
  7. F. Garofalo, Fundamentals of Creep and CreepRupture in Metals, The Macmillian Company, New York, p.258, 1965
  8. F. R. Larson, and J. Miller, 'A Time- Temperature Relationship for Rupture and Creep Stresses,' Transaction of the ASME, Vol.74, pp.765-775, 1952
  9. E. N. da C. Andrade, 'On the Viscous Flow in Metals and Allied Phenomena,' Proc. Roy. Soc., Series A, London, UK, Vol.84, pp.1-12, 1910
  10. F. Garofalo, O. Richmond and W. F. Domis, 'Design of Apparatus for Constant Stress or Constant Load Creep Tests,' Trans. of ASME, Series D, J. of Basic Engineering, Vol.84, pp.287-293, June 1962 https://doi.org/10.1115/1.3657303