Effects of copper content on microstructure and mechanical properties of open-cell steel foams

Hamid Sazegaran; Milad Hojati

doi:10.1007/s12613-019-1767-z

Volume 26 Issue 5

May 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(5): 588-596

Hamid Sazegaran and Milad Hojati, Effects of copper content on microstructure and mechanical properties of open-cell steel foams, Int. J. Miner. Metall. Mater., 26(2019), No. 5, pp. 588-596. https://doi.org/10.1007/s12613-019-1767-z

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Hamid Sazegaran and Milad Hojati, Effects of copper content on microstructure and mechanical properties of open-cell steel foams, Int. J. Miner. Metall. Mater., 26(2019), No. 5, pp. 588-596. https://doi.org/10.1007/s12613-019-1767-z

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Research Article

Effects of copper content on microstructure and mechanical properties of open-cell steel foams

Hamid Sazegaran^1, and
Milad Hojati²

+ Author Affiliations

Corresponding author:
Hamid Sazegaran E-mail: h.sazegaran@qiet.ac.ir
Received: 10 February 2018; Revised: 20 November 2018; Accepted: 22 November 2018

Abstract

Abstract

The effects of copper content on the microstructural and mechanical properties of steel foams are investigated. Spherical urea granules, used as a water-leachable space holder, were coated with a mixture of iron, ultrafine carbon, and different amounts of copper powders. After the mixture was compacted and the space holder was removed by leaching, a sintering process was performed under an atmosphere of thermally dissociated ammonia. Microstructural evaluations of the cell walls were carried out using optical microscopy and scanning electron microscopy in conjunction with energy-dispersive X-ray spectroscopy. In addition, compression tests were conducted to investigate the mechanical properties of the manufactured steel foams. The results showed that the total porosity decreases from 77.2% to 71.9% with increasing copper content in the steel foams. In the foams' microstructure, copper islands are mostly distributed in pearlite and intergranular carbide phases are formed in the grain boundaries. When the copper content was increased from 0 to 4wt%, the elastic modulus, plateau stress, fracture stress, and fracture strain of manufactured steel foams improved 4.5, 6, 6.4, and 2.5 times, respectively.
- steel foam;
- leachable space holder;
- copper content;
- liquid-phase sintering;
- mechanical properties

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