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College Park, Maryland      June 6 - 10 , 2004

W2-A3 (2:15 PM): Residual stresses in cold-drawn eutectoid wires

J. Ruiz-Hervias (NIST Center for Neutron Research; Departamento de Ciencia de Materiales, Universidad Politecnica de Madrid. c/ Profesor Aranguren s/n, E-28040 Madrid (SPAIN)), V. Luzin, H. Prask, T. Gnaeupel-Herold (NIST Center for Neutron Research), M. Elices (Departamento de Ciencia de Materiales, Universidad Politecnica de Madrid. c/ Profesor Aranguren s/n, E-28040 Madrid (SPAIN))

Textures and residual stresses have been determined in cold-drawn eutectoid steel wires (pearlitic microstructure composed of ferrite and cementite phases) by neutron diffraction using the BT8 diffractometer at the NIST Center for Neutron Research (NCNR). Samples corresponding to different stages in the drawing process, and consequently subjected to different plastic deformation were examined. The wire sizes ranged from 10.5 to 5.2 mm diameter and all had the same composition (plain carbon steel with 0.8% C). Stress profiles along three principal directions (axial, radial and hoop) were obtained for the ferrite phase for all the samples with spatial resolution through the wire diameter better then 1 mm. The gauge volume for the radial and hoop components was 0.5x15x0.5 mm3, whereas for the axial component it was 1x1x1 mm3. Different reflections had to be used because diffraction peak intensity was significantly diminished in certain directions due to texture. The results are consistent with earlier measurements, but are the first which examine residual stress evolution for different processing stages in commercial wires.

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