Fatigue crack propagation in dual-phase steels: effects of ferritic-martensitic microstructures on crack path morphology

Journal Article · Fri Jun 01 00:00:00 EDT 1984 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02644714· OSTI ID:5055504

Dutta, V B; Ritchie, R O; Suresh, S

Characteristics of fatigue crack propagation in dual-phase steels have been investigated in a high purity Fe-2Si-0.1C steel with the objective of developing ferritic-martensitic microstructures with maximum resistance to fatigue crack extension while maintaining high strength levels. A range of crack growth rates has been examined from 10/sup -8/ to 10/sup -3/ mm per cycle in duplex microstructures where intercritical heat treatments were used to vary the proportion, morphology, and distribution of the ferrite and martensite phases. Microstructures containing fine globular or coarse martensite in a coarse-grained ferritic matrix yielded the highest ambient temperature fatigue threshold stress intensity range ..delta..K/sub 0/ values reported to date and the highest combination of strength and ..delta..K/sub 0/ for steels

• Research Organization: Materials and Molecular Research Division, Lawrence Berkeley Laboratory, and Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA
• OSTI ID: 5055504
• Journal Information: Metall. Trans., A; (United States), Vol. 15A:6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
STEELS
CRACK PROPAGATION
FATIGUE
MICROSTRUCTURE
CARBON STEELS
DESTRUCTIVE TESTING
FERRITE
HEAT TREATMENTS
IRON ALLOYS
MARTENSITE
MATHEMATICAL MODELS
METALLOGRAPHY
SILICON ALLOYS
ALLOYS
CARBON ADDITIONS
CRYSTAL STRUCTURE
IRON BASE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
TESTING
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies