Measurement of Texture Gradient in Heavily Cold-Drawn Pearlitic Wires

作者：Jamoneau Aurelie; Schmitt Jean Hubert^*; Solas Denis

来源：Advanced Engineering Materials, 2018, 20(4): 1700279.

DOI：10.1002/adem.201700279

• pearlitic steel
• heavily drawn wire
• crystallographic texture
• texture gradient
• X-ray diffraction
• EBSD

It is well established that cold-drawing of pearlitic wire develops a strong anisotropy due to a preferential < 110 > orientation of the ferrite phase parallel to the wire axis. The subsequent wire behavior during torsion, which mainly occurs during assembling of drawn wires, is correlated with the texture and its gradient along the wire radius. Although different attempts were made in the past to measure the texture after drawing, it is still challenging since the final wire diameter is on the order of 0.3 mm. The paper presents a simple and robust method to measure the texture gradient by X-ray diffraction. First, to overcome the problems of a composite sample made of parallel wires, an isotropic reference sample is prepared by cycles of austenite transformation and quenching. The texture gradient is measured at different thicknesses by dissolving the external surface of the wires. This allows the investigation of the first 40 mu m of depth. Finally, the results are compared with EBSD measurements on a longitudinal cross-section to quantify the influence of the drawing conditions: A flat schedule with constant die angles favors a < 110 > fiber texture with a weak gradient, while increasing the drawing angle for three dies increases the gradient.

• 出版日期2018-4