Fracture analysis of drawn composite dual-phase steel wire
The Fe/2 Si/0.1 dual-phase steel was studied with composition 0.08 C, 1.9 Si, 0.32 Mn, 0.004 P, 0.004 S (wt %) to develop the dual-phase structure with various morphologies. Thermal and control rolling thermomechanical processing were used. Treated samples were machined to 5.5 mm diameter and then drawn without coating in a hand operated drawing machine. The microstructures of longitudinal sections before and after deformation were assessed by light optical and scanning electron microscopy (SEM). Void density measurements were performed by SEM at 2000X. A linear relationship was found between true strain and void density after wire drawing low carbon duel-phase steels for all morphologies studied. Void formation was found to begin either by decohesion of the ferrite/martensite interface, or by shear microcracking of the martensite particles. The formation of voids during wire drawing can be correlated with differences in martensite morphology and martensite/ferrite interface coherency. A fibrous distribution of 20% lath martensite in fine-grained ferrite appears to be the most promising composite to obtain high strength ductile wire, e.g., for tire cord application and hence Fe/Si/C rather than Fe/Mn/C steels are preferred. 21 refs., 8 figs., 1 tab.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6114946
- Report Number(s):
- LBL-23250; CONF-8710176-1; ON: DE88001396
- Resource Relation:
- Conference: Interwire conference, Atlanta, GA, USA, 25 Oct 1987; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
IRON ALLOYS
DRAWING
MICROSTRUCTURE
VOIDS
SILICON ALLOYS
STEELS
ANNEALING
CARBON ADDITIONS
FRACTURE MECHANICS
MANGANESE ADDITIONS
MARTENSITE
PHOSPHORUS ADDITIONS
ROLLING
SULFUR ADDITIONS
THERMOMECHANICAL TREATMENTS
WIRES
ALLOYS
CRYSTAL STRUCTURE
FABRICATION
HEAT TREATMENTS
IRON BASE ALLOYS
MANGANESE ALLOYS
MATERIALS WORKING
MECHANICS
360101* - Metals & Alloys- Preparation & Fabrication
360102 - Metals & Alloys- Structure & Phase Studies