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<p>An experimental study was conducted to analyze the distribution of microhardness over the cross-section of cold-worked reinforcement wire produced by drawing with roller dies and subsequent profile application to the wire surface. The distribution of microhardness over the cross-section of a&#xa0;plain wire produced by drawing through a&#xa0;monolithic die followed by straightening was also studied. It was shown that the microhardness of the wire rod is higher in the surface layers than in the center. Similarly, the microhardness of the wire drawn with roller dies (prior to deformation in the profiling head) and wire drawn with monolithic dies (prior to straightening) is higher in the surface layers compared to the center. After the wire surface profiling, the distribution of microhardness over the cross-section of the wire changes to the opposite, i.e., the microhardness in the center of the wire becomes higher than at the surface. A&#xa0;similar effect was observed when straightening the wire drawn through a&#xa0;monolithic die as a&#xa0;result of bending deformation. After straightening, the microhardness in the center of the wire becomes higher than at the surface. The wire strength decreases after straightening. The observed phenomenon is caused by the alternating deformation and the resulting Bauschinger effect in the surface layers during profiling and straightening of the wire. It was shown that the average value of microhardness over the wire cross-section increases at higher deformation levels. At equal deformations, the average microhardness over the wire cross-section is higher after drawing with roller dies compared to monolithic dies.</p>

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Study of the mechanical properties of steel wire drawn using roller and monolithic dies

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • S. M. Goloviznin,
  • D. S. Terskih

摘要

An experimental study was conducted to analyze the distribution of microhardness over the cross-section of cold-worked reinforcement wire produced by drawing with roller dies and subsequent profile application to the wire surface. The distribution of microhardness over the cross-section of a plain wire produced by drawing through a monolithic die followed by straightening was also studied. It was shown that the microhardness of the wire rod is higher in the surface layers than in the center. Similarly, the microhardness of the wire drawn with roller dies (prior to deformation in the profiling head) and wire drawn with monolithic dies (prior to straightening) is higher in the surface layers compared to the center. After the wire surface profiling, the distribution of microhardness over the cross-section of the wire changes to the opposite, i.e., the microhardness in the center of the wire becomes higher than at the surface. A similar effect was observed when straightening the wire drawn through a monolithic die as a result of bending deformation. After straightening, the microhardness in the center of the wire becomes higher than at the surface. The wire strength decreases after straightening. The observed phenomenon is caused by the alternating deformation and the resulting Bauschinger effect in the surface layers during profiling and straightening of the wire. It was shown that the average value of microhardness over the wire cross-section increases at higher deformation levels. At equal deformations, the average microhardness over the wire cross-section is higher after drawing with roller dies compared to monolithic dies.