Fracture analysis of drawn composite dual-phase steel wire

Conference · Wed Jul 01 04:00:00 EDT 1987

OSTI ID:6114946

Sidjanin, L; Miyasato, S; Thomas, G

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
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ANNEALING
CARBON ADDITIONS
CRYSTAL STRUCTURE
DRAWING
FABRICATION
FRACTURE MECHANICS
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE ADDITIONS
MANGANESE ALLOYS
MARTENSITE
MATERIALS WORKING
MECHANICS
MICROSTRUCTURE
PHOSPHORUS ADDITIONS
ROLLING
SILICON ALLOYS
STEELS
SULFUR ADDITIONS
THERMOMECHANICAL TREATMENTS
VOIDS
WIRES