The role of pore wall microstructure and micropores on the mechanical properties of Cu–Ni–Mo based steel foams

Bekoz, Nuray; Oktay, Enver

doi:10.1016/j.msea.2014.06.064

Cited by 27 publications

(6 citation statements)

References 35 publications

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“…According to Gibson and Ashby, the plateau stress (collapse stress) and post-collapse behaviour also depend on the type of foam, whether it is open or closed cell. Bekoz and Oktay [ 90 ] also obtained lower values of compressive yield strengths for Cu–Ni–Mo steel foams as compared to values predicted from Gibson–Ashby mathematical models, as evident from Figure 9 a. It is clear that the relative stress is influenced by the relative density.…”

Section: Mechanical Properties Of Metal Foamsmentioning

confidence: 70%

Microstructure and Mechanical Properties of Metal Foams Fabricated via Melt Foaming and Powder Metallurgy Technique: A Review

et al. 2022

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Metal foams possess remarkable properties, such as lightweight, high compressive strength, lower specific weight, high stiffness, and high energy absorption. These properties make them highly desirable for many engineering applications, including lightweight materials, energy-absorption devices for aerospace and automotive industries, etc. For such potential applications, it is essential to understand the mechanical behaviour of these foams. Producing metal foams is a highly challenging task due to the coexistence of solid, liquid, and gaseous phases at different temperatures. Although numerous techniques are available for producing metal foams, fabricating foamed metal still suffers from imperfections and inconsistencies. Thus, a good understanding of various processing techniques and properties of the resulting foams is essential to improve the foam quality. This review discussed the types of metal foams available in the market and their properties, providing an overview of the production techniques involved and the contribution of metal foams to various applications. This review also discussed the challenges in foam fabrications and proposed several solutions to address these problems.

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Section: Mechanical Properties Of Metal Foamsmentioning

confidence: 70%

Microstructure and Mechanical Properties of Metal Foams Fabricated via Melt Foaming and Powder Metallurgy Technique: A Review

et al. 2022

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“…The existing micropores were also concluded in the calculation of porosity of green compacts. In addition, these two types of pores change their volume during sintering [13,24]. Thus, a schematic diagram was used to describe the process as shown in Fig.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…In order to investigate the dependence of total porosity on spacer content in detail, macroporosity and microporosity were studied quantitatively by some researchers. According to Bekoz et al [13], the macroporosity increased with increasing spacer content, whereas the amount of micropores decreased, which was attributed to the improved compaction efficiency of powder mixtures. Esen et al [14] considered that the micro-, macro-and total porosity changed linearly with increasing spacer content.…”

Section: Introductionmentioning

confidence: 96%

Investigation on Relationship between Spacer Content and Porosity of Steel Foams

Wang

Chang

2018

MSF

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Steel foams have been receiving a growing interest due to the unique structural properties. The space holder technique provides a high degree of freedom and allows to produce this kind of materials varying in a wide range of porosity. However, the accurate prediction of final porosities has been a difficult problem in this technique. Therefore, a nonlinear equation between spacer content (φ1) and porosity (P) of the sintered steel foams was established in this study when macropores, micropores and their volumetric change were taken into account at the same time, that was P = (aφ1+b)/(cφ1+d). Then, validation of the theoretical relationship was carried out using the experimental data by authors and other researchers. The results showed that the porosity could be well predicted by the nonlinear relationship with varied preparing parameters. One set of coefficients in the model equation, i.e., a, b, c, d, corresponds to a certain preparing condition, while these values changed in different preparing conditions.

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“…The copper content in the steel powder provides the formation of the liquid phase in the sintering process and increases the strength of the part. Nickel content reduces the amount of elongation of the sintered part, while molybdenum gives the sintered part high compressibility (Bekoz and Oktay, 2014). This low alloyed powder provides dimensional stability and good green strength and can be sintered at lower temperatures than other steel alloys.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Surface Properties of Eggshell based Kappa-Carrageenan-Polyvinyl Alcohol Nanobiocomposite Coated Low Alloyed Steel Foam

Üllen¹,

Karabulut²,

Karakuş³

2022

European Journal of Science and Technology

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In this study, we developed a novel eggshell based kappa-carrageenan-polyvinyl alcohol nanobiocomposite coated low alloyed steel foam. The prepared nanobiocomposite was preferred as a coating function on the distribution of particles on the low alloyed steel foam. The scanning electron microscopy (SEM), stereo microscope, and fourier transform infrared spectroscopy (FT-IR) techniques were used to determine the chemical and surface properties of the nanobiocomposite and nanobiocomposite coated low alloyed steel foam. According to the characterization results, we observed that the nanobiocomposite coated low alloyed steel foam had a uniform controlled morphology. Furthermore, the mean surface roughness values of uncoated low alloyed steel foam and nanobiocomposite coated low alloyed steel foam were measured as 4.48 µm and 4.61 µm, respectively. Consequently, we showed that the nanobiocomposite was uniformly coated onto the surface of the micropore channel of the low alloyed steel foam. Based on these results, eggshell based kappacarrageenan-polyvinyl alcohol nanobiocomposite is a promising nanomaterial for surface modification of the low alloyed steel foam with a controlled and homogeneously distributed surface feature in biomedical applications using a green approach.

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The role of pore wall microstructure and micropores on the mechanical properties of Cu–Ni–Mo based steel foams

Cited by 27 publications

References 35 publications

Microstructure and Mechanical Properties of Metal Foams Fabricated via Melt Foaming and Powder Metallurgy Technique: A Review

Microstructure and Mechanical Properties of Metal Foams Fabricated via Melt Foaming and Powder Metallurgy Technique: A Review

Investigation on Relationship between Spacer Content and Porosity of Steel Foams

Investigation of Surface Properties of Eggshell based Kappa-Carrageenan-Polyvinyl Alcohol Nanobiocomposite Coated Low Alloyed Steel Foam

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