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Transactions of the Indian Institute of Metals

, Volume 68, Issue 4, pp 553–559 | Cite as

Analysis of the Formation of Surface Crack on Crankshaft After Die Forging

  • Bo Jiang
  • Zheng-qiang Dong
  • Zhong Yang
  • Le-yu Zhou
  • Ya-zheng LiuEmail author
  • Yuan-ning Wang
Technical Paper

Abstract

The causes are investigated for the formation of surface crack on a crankshaft based on numerical simulation, light microscopy and SEM analysis in this study. It is concluded that inclusion is not the reason for the crack initiation. Coarse microstructure and shrinkage cavities were found in the centre of billet, and then were observed to flow to the crack by 3D simulation analysis of forging process. In order to identify the simulation result, the size and distribution of prior austenitic grain and shrinkage porosities at the crack on the crankshaft were analyzed. Results show that the size of prior austenitic grain and shrinkage porosities and the volume fraction of shrinkage porosity are larger at the crack compared with that at other part of the crankshaft. The work shows that the coarse microstructure and shrinkage cavities flowing from the centre of the billet is the cause of the surface crack during the induction hardening process.

Keywords

Crankshaft Surface crack 3D Simulation Shrinkage cavity Induction hardening 

Notes

Acknowledgments

The author is indebted to Professor Ya-zheng Liu of the University of Science and Technology Beijing for her encouragement in pursuing this problem area and for many stimulating discussions. Acknowledgement is also given to Transvic Technology Co. Ltd for their support of Forge software.

References

  1. 1.
    Alves L M, and Martins P A F, J Mater Process Technol 211 (2011) 467.CrossRefGoogle Scholar
  2. 2.
    Gao G K, Liu J F, and Gu Z K, Automob Technol Mater 6 (2005) 2.Google Scholar
  3. 3.
    Taylor D, and Knott J F, Fatigue Fract Eng Mater Struct 4 (1981) 147.CrossRefGoogle Scholar
  4. 4.
    Raj R, and Ashby M F, Acta Metall 23 (1975) 653.CrossRefGoogle Scholar
  5. 5.
    Zhu H W, Liu Y Z, and Zhou L Y, Int J Min Metall Mater 19 (2012) 421.CrossRefGoogle Scholar
  6. 6.
    Paris P C, Gomez M P, and Anderson W E, The Trend Eng 13 (1961) 9.Google Scholar
  7. 7.
    Suzuki H, and McEvily A J, Metall Trans A, 10 (1979) 475.CrossRefGoogle Scholar
  8. 8.
    Li G B, Wu J J, and Jiang Y F, Mater Process Technol 100 (2000) 63.CrossRefGoogle Scholar
  9. 9.
    Melander A, and Gustavsson A, Int J Fatigue 18 (1996) 389.CrossRefGoogle Scholar
  10. 10.
    Porter D A, and Easterling K E, Phase Transformations in Metals and Alloys, CRC Press, Florida (1992), p 382.CrossRefGoogle Scholar
  11. 11.
    Iron B, Physical Properties of Martensite and Bainite, Iron and Steel Institute Special Report No. 93, Iron and Steel Institute, Minnesota (1965).Google Scholar
  12. 12.
    Withers P J, and Bhadeshia H, Mater Sci Technol 17 (2001) 366.CrossRefGoogle Scholar
  13. 13.
    Bowles J S, and Mackenzie J K, Acta Metall 2 (1954) 129.CrossRefGoogle Scholar
  14. 14.
    Wang Z D, and Mou J M, Rapid Heat Treatment of Steel with Induction Heating, Chemical Industry Press, Beijing (2012), p 48.Google Scholar
  15. 15.
    Henry G, and Horstmann D, De Ferri Metallographia, Stahleisen, Diisseldorf (1979), p 367.Google Scholar
  16. 16.
    Bowles C Q, and Schijve J, Inter J Fract 9 (1973) 171.CrossRefGoogle Scholar
  17. 17.
    Gao Y X, Yi J Z, and Lee P D, Fatigue Fract Eng Mate Struct 27 (2004) 559.CrossRefGoogle Scholar
  18. 18.
    Mayer H, Papakyriacou M, and Zettl B, Inter J Fatigue 25 (2003) 245.CrossRefGoogle Scholar
  19. 19.
    Ammar H R, Samuel A M, and Samuel F H, Mater Sci Eng A 473 (2008) 65.CrossRefGoogle Scholar

Copyright information

© The Indian Institute of Metals - IIM 2014

Authors and Affiliations

  • Bo Jiang
    • 1
  • Zheng-qiang Dong
    • 1
  • Zhong Yang
    • 2
  • Le-yu Zhou
    • 1
  • Ya-zheng Liu
    • 1
    Email author
  • Yuan-ning Wang
    • 3
  1. 1.School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingChina
  2. 2.Xining Special Steel Co. Ltd.XiningChina
  3. 3.Transvic Technology Co. Ltd.BeijingChina

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