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The role of microstructure on the strength and toughness of fully pearlitic steels

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Abstract

An experimental program was carried out to clarify the structure-property relationships in fully-pearlitic steels of moderately high strength levels, and to identify the critical microstructural features that control the deformation and fracture processes. Specifically, the yield strength was shown to be controlled primarily by the interlamellar pearlite spacing, which itself was a function of the isothermal transformation temperature and to a limited degree the prior-austenite grain size. Charpy tests on standard and fatigue precracked samples revealed that variations in the impact energy and dynamic fracture toughness were dependent primarily on the prior-austenite grain size, increasing with decreasing grain size, and to a lesser extent with decreasing pearlite colony size. These trends were substantiated by a statistical analysis of the data, that identified the relative contribution of each of the dependent variables on the value of the independent variable of interest. The results were examined in terms of the deformation behavior being controlled by the interaction of slip dislocations with the ferrite- cementite interface, and the fracture behavior being controlled by a structural subunit of constant ferrite orientation. Preliminary data suggests that the size of such units are controlled by, but are not identical to, the prior-austenite grain size. Possible origins of this fracture unit are considered.

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References

  1. T. Gladman, I. McIvor, and F. Pickering:J. Iron Steel Inst., 1972, vol. 210, p. 916.

    CAS  Google Scholar 

  2. M. Gensamer, E. B. Pearsall, W. S. Pellini, and J. R. Low, Jr.:Trans. ASM, 1942, vol. 30, p. 983.

    CAS  Google Scholar 

  3. T. Takahashi and M. Nagumo:Trans. Jap. Inst. Metals, 1970, vol. 11, p. 113.

    CAS  Google Scholar 

  4. J. Gross and D. Stout:Weld. J., 1955, vol. 34, p. 117S.

    CAS  Google Scholar 

  5. G. Burns and C. Judge:J. Iron Steel Inst., 1956, vol. 182, p. 292.

    CAS  Google Scholar 

  6. A. Turkalo:Trans. TMS-AIME, 1960, vol. 218, p. 24.

    CAS  Google Scholar 

  7. R. Grange:Met. Trans., 1971, vol. 2, p. 65.

    Article  CAS  Google Scholar 

  8. American Society for Testing Materials, 1974 Standard Designation E-112.

  9. D. Brown and R. Ridley:J. Iron Steel Inst., 1966, vol. 204, p. 812.

    Google Scholar 

  10. R. A. Wullaert:ASTM STP 466, p. 148, 1970.

  11. G. E. Dieter:Mechanical Metallurgy, p. 370, McGraw-Hill, N.Y., 1961.

    Google Scholar 

  12. J. R. Vilella, G. E. Guellich, and E. C. Bain:Trans. ASM, 1936, vol. 24, p. 225.

    CAS  Google Scholar 

  13. B. Karlsson and G. Linden:Mater. Sci. Eng., 1975, vol. 17, p. 153.

    Article  CAS  Google Scholar 

  14. A. Rosenfield, E. Votava, and G. Hahn:Trans. ASM, 1968, vol. 61, p. 807.

    Google Scholar 

  15. A. Rosenfield, G. Hahn, and J. Embury:Met. Trans., 1972, vol. 3, p. 2797.

    Article  CAS  Google Scholar 

  16. U. Lindborg:Trans. ASM, 1968, vol. 61, p. 500.

    CAS  Google Scholar 

  17. C. S. Smith:Trans. ASM, 1953, vol. 45, p. 533.

    CAS  Google Scholar 

  18. R. J. Dippenaar and R. W. K. Honeycombe:Proc. Roy. Soc., London, 1973, vol. A333, p. 455.

    Google Scholar 

  19. Y. J. Park:Unpublished research, Department of Metallurgy and Materials Sci- ence, Carnegie-Mellon University, Pittsburgh, Pa., 1974.

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Hyzak, J.M., Bernstein, I.M. The role of microstructure on the strength and toughness of fully pearlitic steels. Metall Trans A 7, 1217–1224 (1976). https://doi.org/10.1007/BF02656606

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