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Low Cycle Fatigue Behavior of Ti-6AI-2Sn-4Zr-6Mo: Part I. The Role of Microstructure in Low Cycle Crack Nucleation and Early Crack Growth

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Abstract

Widmanstätten + grain boundary (W + GB) α and equiaxed (E) structures of different α particle sizes were produced in smooth bar specimens of a Ti-6Al-2Sn-4Zr-6Mo alloy, heat treated to produce a 0.2 pct yield stress of about 1100 MPa. Specimens were cycled at room temperature under total strain control. For both W + GB and Eα structures at low strains crack initiation occurred at α-β interfaces and in the aged β matrix. Profuse extrusions were found in the W + GBα structure. At higher strains for both structures, crack initiation took place preferentially within slip bands in α. Surface crack nucleation and crack link-up occurred more readily in W + GBα structures, which had a shorter life28 than Eα structures, a phenonmenon thought to be due to the much longer surface lengths of the cracks in W + GBα structures. Larger prior β grain size permitted surface cracks to be developed more readily, but the role of β grain size is an indirect one. At large plastic strains colonies of Wα at large angles to the direction of crack propagation can cause the crack to change directions. An explanation for this behavior is offered.

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References

  1. J.C. Williams and M.J. Blackburn:Trans. TMS-AME, 1967, vol. 239, p. 287.

    Google Scholar 

  2. C.G. Rhodes and J. C. Williams:Metall. Trans. A, 1975, vol. 6A, p. 1969.

    Google Scholar 

  3. C.G. Rhodes and J.C. Williams: Tech. Report AFML-TR-73-301, under Air Force Contract No. F 33615-71-C1560, 1974.

  4. H. Margolin, E. Levine, and M. Young:Metall. Trans. A, 1979, vol. 8A, p. 373.

    Google Scholar 

  5. Y. Mahajan and H. Margolin:Metall. Trans. A, 1978, vol. 9A, p. 427.

    CAS  Google Scholar 

  6. C.H. Wells and C.P. Sullivan:Trans. ASM, 1969, vol. 62, p. 263.

    CAS  Google Scholar 

  7. D.K. Benson, J.C. Grosskreutz, and G.C. Shaw:Metall. Trans., 1972, vol. 3, p. 123.

    Article  Google Scholar 

  8. C.A. Stubbington and A.W. Bowen:J. Mater. Sc., 1974, vol. 9, p. 941.

    Article  CAS  Google Scholar 

  9. J. C. Grosskreutz:ASTM STP, 1972, vol. 495, p. 5.

    Google Scholar 

  10. W. H. Kim and C. Laird:Acta Met., 1978, vol. 26, p. 789.

    Article  CAS  Google Scholar 

  11. Y. Saleh and H. Margolin:Acta Met., 1979, vol. 27, p. 535.

    Article  CAS  Google Scholar 

  12. H. Margolin, Y. Mahajan, and Y. Saleh:Scripta Met., 1976, vol. 12, p. 1115.

    Article  Google Scholar 

  13. C. W. Price and J. P. Hirth:Mater. Sci. &Eng., 1972, vol. 9, p. 15.

    Article  CAS  Google Scholar 

  14. J.C.M. Li:Trans. TMS-AIME, 1963, vol. 227, p. 239.

    CAS  Google Scholar 

  15. P.G. Partridge:Acta Met., 1965, vol. 13, p. 517.

    Article  CAS  Google Scholar 

  16. W. A. Beslack, III and Y. Mahajan:Scripta Met., 1979, vol. 13, p. 959.

    Article  Google Scholar 

  17. Y. Mahajan and W.A. Baeslack III,:Scripta Met., 1979, vol. 13, p. 1125.

    Article  CAS  Google Scholar 

  18. W. A. Baeslack and Y. Mahajan:Metall. Trans. A., 1980, vol. 12A, p. 1234.

    Google Scholar 

  19. Y. Mahajan, D. Becker, and W. A. Baeslack III, : unpublished research, Air Force Materials Lab., WPAFB, 1979-1980.

  20. J. Jindrich, S. Ankern, and H. Margolin:Mat. Sci. & Engr., 1978, vol. 34, p. 203.

    Article  Google Scholar 

  21. S. Ankem and H. Margolin: unpublished research, Polytechnic Institute of New York, NY, 1980.

  22. C. Hammond: unpublished research, Polytechnic Institute of New York, NY, 1980.

  23. Y. Mahajan and H. Margolin:Scripta Met., 1979, vol. 13, p. 451.

    Article  CAS  Google Scholar 

  24. P.A. Albert:Trans. AIME, 1953, vol. 197, p. 1449.

    Google Scholar 

  25. G.R. Irwin:Trans. ASME, J. App. Mech., 1962, vol. 29, p. 651.

    Google Scholar 

  26. Y. Mahajan and H. Margolin:Metall. Trans. A, 1982, vol. 13A, p. 269.

    CAS  Google Scholar 

  27. Y. Saleh and H. Margolin: unpublished research, Polytechnic Institute of New York, NY, 1979.

  28. H. Hoo: Master's Thesis, New York University, 1971.

  29. G.R. Yoder, L. A. Cooley, and T.W. Crooker:Metall. Trans. A., 1977, vol. 8A, p. 1737.

    CAS  Google Scholar 

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Authors and Affiliations

  1. Development Group, at Design Bureau, Hindustan Aeronautics Ltd., 560017, Bangalore, India

    Yashwant Mahajan (Development Manager)

  2. Department of Physical and Engineering Metallurgy, Polytechnic Institute of New York, 11201, Brooklyn, NY

    Harold Margolin (Professor)

Authors
  1. Yashwant Mahajan
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  2. Harold Margolin
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Mahajan, Y., Margolin, H. Low Cycle Fatigue Behavior of Ti-6AI-2Sn-4Zr-6Mo: Part I. The Role of Microstructure in Low Cycle Crack Nucleation and Early Crack Growth. Metall Trans A 13, 257–268 (1982). https://doi.org/10.1007/BF02643316

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  • DOI: https://doi.org/10.1007/BF02643316

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