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Low‐cycle fatigue properties of microalloyed medium carbon precipitation hardening steels in comparison to quenched and tempered steels
Author(s) -
Krabiell Armin,
Reichel Ulrich
Publication year - 1993
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199301048
Subject(s) - materials science , metallurgy , hardening (computing) , softening , precipitation hardening , strain hardening exponent , carbon steel , composite material , microstructure , layer (electronics) , corrosion
Monotonic and cyclic stress strain curves and strain fatigue‐life curves of a normalized carbon steel Cf 53 N, two quenched and tempered steels Ck 45 QT, 34 CrMoS 4 QT and three microalloyed medium‐carbon precipitation‐hardening steels 27 MnSiVS 6 + Ti BY, 38 MnSiVS 5 BY and 44 MnSiVS 6 + Ti BY, have been evaluated. Similar strain hardening was observed in the monotonic tensile tests whereas different hardening or softening was found under cyclic loading conditions. QT steels reveal pronounced cyclic softening over the entire strain range investigated, the ferritic pearlitic steels show only a slight decrease in the cyclic proof stress and cyclic hardening at larger strains. Strain fatigue‐life curves result in a common scatterband of all steels investigated with the microalloyed steels 27 MnSiVS 6 + Ti BY and 44 MnSiVS 6 + Ti BY lying at the upper limit. Crack initiation probability of the microalloyed medium‐carbon precipitation‐hardening steels in the low‐cycle fatigue range is equivalent or lower than for the normalized carbon steel and the QT‐steels.