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Investigation of Charpy impact behavior of porous twisted wire material

Published online by Cambridge University Press:  29 May 2017

Zhaoyao Zhou ,
Liuyang Duan  and
Fei Wu
Zhaoyao Zhou
Affiliation:
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 0086-510045, Guangdong, China
Liuyang Duan*
Affiliation:
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 0086-510045, Guangdong, China
Fei Wu
Affiliation:
School of Materials and Energy, Guangdong University of Technology, Guangzhou 0086-510045, Guangdong, China
*
a) Address all correspondence to this author. e-mail: me201410100179@mail.scut.edu.cn
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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.

Keywords

porous twisted short wire materialpore size distributionCharpy impact behaviorimpact toughness
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 12 , 28 June 2017 , pp. 2276 - 2285
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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