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Investigation of Charpy impact behavior of porous twisted wire material

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Abstract

A novel stainless steel porous twisted wire material (PTWM) is made of twisted short wires by compaction followed by vacuum high-temperature solid-phase sintering. The twisted short wires are fabricated by using a self-developed rotary multicutter tool to cut stainless steel wire ropes. The PTWMs with 46–70% porosities have been investigated in terms of porous structures and Charpy impact behavior. The PTWMs with spatial composite intertexture structures exhibit interconnected open-pore microstructures with a variety of shapes and sizes. The pore size distributions became convergent with decreasing porosities. The span of pore distribution of the PTWM with a diameter of 90 μm was half than that of the PTWM with a diameter of 160 μm under 65–66% porosity. The impact toughness of the former is 2.6 times than that of the latter. By increasing the porosity from 46 to 70%, the impact toughness decreases from 17.9 to 9.1 J/cm2. Macroscopically integral failure-morphologies of the PTWMs present mixed ductile–brittle failure mechanisms, but microscopic impact deformation and failure mechanisms mainly show the ductile failure and fracture of pore skeletons. The PTWMs demonstrate complex energy absorption mechanisms.

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ACKNOWLEDGMENTS

This research work was supported by the Science and Technology Program of Guangzhou, China (No. 201604016015) and National Natural Science Foundation of China (No. 51274103).

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Authors and Affiliations

  1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, Guangdong, 0086-510045, China

    Zhaoyao Zhou & Liuyang Duan

  2. School of Materials and Energy, Guangdong University of Technology, Guangzhou, Guangdong, 0086-510045, China

    Fei Wu

Authors
  1. Zhaoyao Zhou
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  2. Liuyang Duan
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  3. Fei Wu
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Correspondence to Liuyang Duan.

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Zhou, Z., Duan, L. & Wu, F. Investigation of Charpy impact behavior of porous twisted wire material. Journal of Materials Research 32, 2276–2285 (2017). https://doi.org/10.1557/jmr.2017.195

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  • DOI: https://doi.org/10.1557/jmr.2017.195

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