Investigation of Charpy impact behavior of porous twisted wire material
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Fei Wu School of Materials and Energy, Guangdong University of Technology, Guangzhou 0086-510045, Guangdong, China (Received 15 January 2017; accepted 28 April 2017)
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 lm was half than that of the PTWM with a diameter of 160 lm 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.
I. INTRODUCTION
Porous fiber/wire metals with metallic fibers/wires as raw materials refer to a metallic body with through-pores integrated in their structures. Compared with other porous materials, porous fiber/wire metals have many favorable characteristics. For example, the mechanical strength, stiffness, and ability to impact energy absorption are much higher than those of polymer foams. They maintain their mechanical properties at wide working temperature ranges and keep more stable performance in harsh environments compared to polymer foams. Besides, they are thermally and electrically conductive and slow aging than polymer foams. As opposed to ceramics, they have a good ability to deform plastically and load in the static or dynamic condition. They can be fabricated by a simple manufacturing process and achieve the integration of high surface area, perfect permeability, and the above advantages.1,2 Due to their comprehensive properties, porous fiber/wire metals are widely used in the engineering field. There has been considerable interest in the
Contributing Editor: Jürgen Eckert a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2017.195
production and mechanical properties of porous fiber/ wire metals. Metallic fibers/wires have some merits as the raw materials used for fabricating porous fiber/wire metals. Mass production of fibers/wires is a mature technology. Most of the metals including tungsten and zirconium can be made into fibers/wires. A mother material with high strength and low defects can be easily obtained from wires, such as stainless steel wires, carbon steel wires, aluminum allo
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