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Phase transformation of stainless steel during fatigue

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Abstract

Transformation of austenite during cyclic loading was studied in AISI 301 and 304 alloys whose stability was adjusted by heat treatment and temperature changes. Fatigue life was determined under controlled strain amplitude tension-compression conditions. The amount of transformation to α’ (bcc) martensite was continuously indicated magnetically during testing, and the α’ and ∈ (hcp) phases were observed metallographically at failure. It was found in room temperature testing that at strain amplitudes in excess of 0.4 pct the formation of α’ (bcc) martensite was detrimental to the fatigue life. At 200°F (366 K) the fatigue life of an unstable alloy was increased, while in a completely stable austenitic alloy (20Cr, 6Ni, 9Mn), the life at 200°F (366 K) was less than that at room temperature for the same cyclic strain amplitude. The differing effect of temperature on life of these two types of alloy is attributed to the alteration of the austenite stacking fault energy and the relative free energies of the α’ (bcc), ∈ (hcp) and γ (fcc) phases in the unstable alloys. It has been observed that within the standard composition ranges of the two 300 series stainless steel grades there can be marked differences in the degree of transformation resulting from cyclic loading. This has the implication that for fatigue applications modifications in the specifications for the different grades of stainless would be advantageous.

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Author information

Author notes

  1. Gary Steckel (Research Assistant)

    Present address: University of Illinois, USA

Authors and Affiliations

  1. Essex International, Ft. Wayne, IN

    Daniel Hennessy

  2. Metallurgy Department and the Materials Research Laboratory, University of Illinois at Urbana-Champaign, 61801, IL

    Carl Altstetter (Member)

Authors
  1. Daniel Hennessy
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  2. Gary Steckel
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  3. Carl Altstetter
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Formerly a Research Assistant

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Hennessy, D., Steckel, G. & Altstetter, C. Phase transformation of stainless steel during fatigue. Metall Trans A 7, 415–424 (1976). https://doi.org/10.1007/BF02642838

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  • DOI: https://doi.org/10.1007/BF02642838

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