Abstract
The micro structure of commercially pure iron filament which was manufactured by the method of vycor glass conjugated melt spinning with various winding speeds was investigated and the following results were obtained:
1) The residual stress in iron filament manufactured by winding speed more than 100 m/min is observed to be compressive one of a few kg/mm2.
2) On a scanning electron microscope after the electrolytic polishing the etch pits are found on the surface of iron filament, and the strain figures are found on the iron filament spun at 146.4 m/min winding speed, but those are not observed on the iron filament spun at 61.2 m/min winding speed.
The etch pit density (ρ) is related to the deformation on the winding (ε), by ρ=Cεα, where C and α are found to be 3×109/cm2 and 8, respectively.
3) The line broadening and the peak shift on X-ray line profile of iron filament are measured by means of the X-ray diffractometer method. The line-broadening of iron filament is considered to be due to the distribution of lattice strain, and the slight distribution of lattice strain is found on the iron filament spun at more than 100 m/min winding speed.
The peak shift increases with increasing winding speed, which is considered due to the combined effects of tensile stress and rapid cooling treatment on spinning.
