Abstract
Fatigue behavior of four high-Mn (18 to 22 wt pct Mn) steels, after cold rolling and soft annealing, were investigated in reversed plane bending in a high-cycle regime. The surfaces of fatigued specimens were examined using an optical microscope, a scanning electron microscope (SEM), and an atom force microscope (AFM). It was discovered that the chemical composition of the steel had only a minor influence on fatigue behavior, and the fatigue limit (FL), i.e., the stress amplitude leading to more than 2·106 cycles to failure, of all steels is about 400 MPa. This is about 42 to 48 pct of their tensile strength whose value is comparable to that of austenitic stainless steel and 780 MPa transformation induced plasticity (TRIP) steel. Mechanical twinning does not occur in the course of cycling; however, intense slip bands are formed. Fatigue cracks tend to nucleate at quite an early stage of fatigue life and most commonly on grain and annealing twin boundaries due to intersections of slip bands and boundaries.
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Zwick Z 100 is a trademark of Zwick Roell GmbH & Co. KG, ULM, Germany.
Schenck WEBI is a trademark of Carl Schenck Ag, Darmstadt, Germany.
Carl Zeiss Ultra plus is a trademark of Carl Zeiss SMT Inc., Peabody, MA.
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The majority of this work was performed within the project RFSR-CT-2005-00030 and funded by the Research Fund for Coal and Steel (RFCS), The European Commission, Brussels.
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A.S. HAMADA, Postdoctoral Fellow, on leave from the Department of Metallurgical and Materials Engineering, Faculty of Petroleum & Mining Engineering, Suez Canal University, Suez, Egypt
Manuscript submitted March 4, 2009.
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Hamada, A., Karjalainen, L., Ferraiuolo, A. et al. Fatigue Behavior of Four High-Mn Twinning Induced Plasticity Effect Steels. Metall Mater Trans A 41, 1102–1108 (2010). https://doi.org/10.1007/s11661-010-0193-7
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DOI: https://doi.org/10.1007/s11661-010-0193-7