617 細線材の付加的せん断ひずみ層が材料の強度・延性におよぼす影響(OS 塑性加工(4))

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  • Effect of Additional Shear Strain Layer on Strength and Ductility of Fine Drawn Wire

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Fine wires on the order of 0.1 mm in diameter have become popular for mechanical and electrical applications. In general, fine wires produced by the drawing process have both high strength and high ductility. In the wire drawing process, a large shear deformation zone with a hardened layer, referred to as the "additional shear strain layer", is generated beneath the surface layer of the wire. It is expected that this layer have high tensile strength with keeping ductility because of fine microstructure. Hence, we aimed the additional shear strain layer as one of the main factors for increasing the tensile strength and maintaining the ductility. Tensile tests of fine wires with and without the additional shear strain layer prove that the additional shear strain layer affects the strength and ductility of the wire. In summary, the additional shear strain layer affects the strength and ductility of fine wires.

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