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Title:Cyclic Deformation and Fatigue Behavior of Hardened Steels
Author(s):Landgraf, R.W.
Abstract:Changes in deformation resistance are studied during completely reversed strain cycling of steels hardened to yield strengths in excess of 200 ksi by quenching and tempering, quenching and deforming at elevated temperature, ausforming and maraging. Untempered steel and ausformed steel exhibit cyclic hardening; slightly tempered steel is cyclically stable. Varying amounts of cyclic softening occur in intermediate hardness quenched and tempered steel, quenched and deformed steel and maraging steel. Such cyclically induced changes can be predicted from a steel's monotonic strain hardening exponent and are characterized in terms of a cyclic stress -strain curve. Log-log linear relations between elastic strain and fatigue life and plastic strain and fatigue life adequately describe the fatigue behavior of hardened steels. Monotonic true fracture strength and ductility approximate intercept values in the relations thus providing reliable indications of a steel's fatigue resistance. The optimum condition for maximum fatigue resistance shifts from high hardnesses at long lives, where strength is the determining factor, to lower hardnesses at shorter lives, where ductility becomes more important. Trends between structure and cyclic behavior are discussed along with approaches for attaining improved fatigue resistance in steel.
Issue Date:1968-11
Publisher:Department of Theoretical and Applied Mechanics (UIUC)
Citation Info:T.A.M. Report 320, University of Illinois, Urbana, Illinois (1968)
Series/Report:TAM Reports 320, (1968)
Genre:Technical Report
Publication Status:published or submitted for publication
Peer Reviewed:is peer reviewed
Sponsor:Caterpillar Tractor Co 68/11; La Salle Steel Co 68/11; United States Steel Corp 68/11
Date Available in IDEALS:2007-03-22

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