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논문 기본 정보

자료유형
학술저널
저자정보
Hamid Sazegaran (Quchan University of Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.9
발행연도
2021.9
수록면
3,371 - 3,384 (14page)
DOI
10.1007/s12540-020-00659-z

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초록· 키워드

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In this study, open-cell steel foams containing 0.6 wt% carbon and 2 wt% phosphorous have been manufactured through powdermetallurgy route using urea granules as leachable space holder. Influences of applied pressure (100, 150, and 200 MPa),sintering temperature (1050, 1100, and 1150 °C), and sintering time (40, 50, and 60 min) on size and sphericity of the cells,pores specifications, porosity percentage, thickness and microstructure of the cells walls, and mechanical properties of thesteel foam specimens were investigated. The microstructures of the cells walls were evaluated using optical microscopy andscanning electron microscopy equipped image processing software. To study the mechanical properties, compressive testswere conducted on the steel foam specimens. The averages of cells diameter, sphericity of cells, and thickness of cells wallswere measured to be 0.78 mm, 0.842, and 183 μm, respectively. When the production parameters increase, the mean diameterof the pores decreases and the mean sphericity of the pores increases. Increasing the applied pressure, sintering temperature,and sintering time reduces, individually, the porosity percentage from 79.32 to 73.61%, 77.01 to 75.81%, and 77.81 to 75.12%,respectively. The microstructure of the cells walls consists of ferrite, pearlite, and iron-phosphorous phase. Iron-phosphorousphase formed at boundaries of agglomerated iron particles improves bonding, due to liquid phase sintering. Elastic region,long saw-toothed plateau region, and fracture point are observed in compressive stress versus strain curves. Increasing theapplied pressure, sintering temperature, and sintering time enhances the plateau stress and absorb energy of the steel foams.

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