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Fatigue Crack Propagation in Intercritically Tempered Fe-9Ni-0.1C and Fe-4Mn-0.15C

  • Symposium on Tempering of Steel
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Abstract

Fatigue crack propagation was studied for two intercritically tempered cryogenic steels, Fe-9Ni-0.1C and Fe-4Mn-0.15C, at both intermediate (stage II) and low (stage I, near threshold) stress intensity ranges. Propagation rates were determined for varying intercritical tempering times corresponding to varying amounts of retained austenite and untempered martensite. The results show that the heat treatments that optimize impact fracture properties in the nickel steel are also beneficial with respect to the fatigue crack propagation rate in stage I, while no beneficial effect beyond that attributable to carbon redistribution was observed for stage II. For the manganese steel, heat treatments leading to increased concentrations of retained austenite also increased the threshold stress even though no improvement in fracture toughness was observed. To clarify the origin of this improved behavior, the fracture surface was analyzed by Mössbauer Spectroscopy and Auger Electron Microprobe. The Mössbauer results indicated that the retained austenite in the crack path is transformed to martensite as was earlier shown in this laboratory for Charpy specimens. Auger composition analysis suggested a tendency for a stage I crack tip to avoid the mechanically induced brittle untempered martensite in the Fe-Mn steel, while no such preference was observed for stage II.

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Authors and Affiliations

  1. Instituto de Pesquisas Technologicas, Divisao de Metalurgia, Sao Paulo, Brazil

    H. J. Choi

  2. Northwestern University, 60201, Evanston, IL

    L. H. Schwartz (Professor of Materials Science and Engineering and Director, Materials Research Center)

Authors
  1. H. J. Choi
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  2. L. H. Schwartz
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Additional information

This paper is based on a presentation made at the “Peter G. Winchell Symposium on Tempering of Steel” held at the Louisville Meeting of The Metallurgical Society of AIME, October 12-13, 1981, under the sponsorship of the TMS-AIME Ferrous Metallurgy and Heat Treatment Committees.

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Choi, H.J., Schwartz, L.H. Fatigue Crack Propagation in Intercritically Tempered Fe-9Ni-0.1C and Fe-4Mn-0.15C. Metall Trans A 14, 1089–1099 (1983). https://doi.org/10.1007/BF02659857

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