ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
Regular Article
Residual Stress Analysis of Cold-drawn Pearlite Steel Wire Using White Synchrotron Radiation
Masayoshi KumagaiShigeo SatoShigeru SuzukiMuneyuki ImafukuHitoshi TashiroShin-ichi Ohya
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2015 Volume 55 Issue 7 Pages 1489-1495

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Abstract

Measurement of the residual stresses in cold-drawn pearlitic steel wire was conducted using an energy dispersive X-ray diffraction technique. The residual stresses of the ferrite and cementite phases were determined for different crystal orientations and large residual stresses were found to exist in the cold-drawn pearlitic steel wire. The residual stresses in the ferrite phase were compressive in the axial direction but nearly zero in the hoop and radial directions. In addition, the residual stresses of the reflection indices for the ferrite phase were similar to one another. For the cementite phase, while tensile residual stress existed in the axial direction, compressive residual stress existed in the hoop and radial directions. These stresses in the ferrite phase in the axial direction and cementite phase in all directions decreased along the radial positions. A residual stress state model was proposed on the basis of the aligned lamellar structure along the drawing direction; the model explains the effect of the lamellar direction on residual stress. Reanalysis of the wire sample using the proposed model provided residual strains and stresses in the lamellar direction that were different from the average values estimated using the simple stress analysis method.

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© 2015 by The Iron and Steel Institute of Japan
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