Journal Published Online: 26 September 2014
Volume 4, Issue 2

Extension of Fatigue Cracks in a Low-Alloy Steel After Massive Plastic Deformation

CODEN: MPCACD

Abstract

Fatigue crack extension was studied in a ferritic–pearlitic steel in two different material conditions. The first one was the virgin state with a typical pearlitic microstructure containing comparatively large stacks of cementite lamellae. The second material contained predominantly globular cementite and stacks of very fine cementite lamellae and was found after massive plastic deformation during a thermo-mechanical forming process. These differences in the microstructure lead to significantly different mechanisms in the damage accumulation process under fatigue loading. Stacks of cementite lamellae pearlite were both crack initiation sites and microstructural barriers for small cracks in the virgin material, whereas the fine lamellae in the plastically deformed (cold-worked) material could cause crack deviation, but no crack initiation and no significant crack arrest or crack retardation.

Author Information

Brueckner-Foit, A.
Institute for Materials Engineering, Univ. of Kassel, Kassel, DE
Besel, M.
DLR, Institute for Materials Research, Cologne, DE
Stein, T.
Institute for Materials Engineering, Univ. of Kassel, Kassel, DE
Zeismann, F.
Institute for Materials Engineering, Univ. of Kassel, Kassel, DE
Pages: 9
Price: $25.00
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Details
Stock #: MPC20140011
ISSN: 2165-3992
DOI: 10.1520/MPC20140011