Estimating the Effective Elastic Parameters of Nodular Cast Iron from Micro-Tomographic Imaging and Multiscale Finite Elements: Comparison between Numerical and Experimental Results

Pereira, António; Costa, Marcio; Anflor, Carla Tatiana Mota; Pardal, Juan Manuel; Leiderman, Ricardo

doi:10.3390/met8090695

Cited by 12 publications

(7 citation statements)

References 28 publications

(47 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We calculate the elastic parameters of the effective layers for varying thicknesses of the CoFeB layer. This is done by adapting the proportion method, where elastic parameters of individual layers are multiplied by the volume fraction of the effective layer, added thereafter, and averaged out with the total volume 64 , 65 . There is no unique way to do this, and different literatures propose different procedures 66 , 67 .…”

Section: Discussionmentioning

confidence: 99%

Influence of CoFeB layer thickness on elastic parameters in CoFeB/MgO heterostructures

Shekhar

Mielcarek

Otani

et al. 2023

Sci Rep

View full text Add to dashboard Cite

The surface acoustic waves, i.e., surface phonons may have huge potential for future spintronic devices, if coupled to other waves (e.g., spin waves) or quasiparticles. In order to understand the coupling of acoustic phonons with the spin degree of freedom, especially in magnetic thin film-based heterostructures, one needs to investigate the properties of phonons in those heterostructures. This also allows us to determine the elastic properties of individual magnetic layers and the effective elastic parameters of the whole stacks. Here, we study frequency versus wavevector dispersion of thermally excited SAWs in CoFeB/MgO heterostructures with varying CoFeB thickness by employing Brillouin light spectroscopy. The experimental results are corroborated by finite element method-based simulations. From the best agreement of simulation results with the experiments, we find out the elastic tensor parameters for CoFeB layer. Additionally, we estimate the effective elastic parameters (elastic tensors, Young’s modulus, Poisson’s ratio) of the whole stacks for varying CoFeB thickness. Interestingly, the simulation results, either considering elastic parameters of individual layers or considering effective elastic parameters of whole stacks, show good agreement with the experimental results. These extracted elastic parameters will be very useful to understand the interaction of phonons with other quasiparticles.

show abstract

Section: Discussionmentioning

confidence: 99%

Influence of CoFeB layer thickness on elastic parameters in CoFeB/MgO heterostructures

Shekhar

Mielcarek

Otani

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Now, taking f M = 16 vol.%, the M s temperature was calculated as 42 °C. The tensile stress was calculated according to Equations (2)–(6) using the following parameters: T sol = 1320 °C [ 49 ], E = 200 GPa [ 62 ], ν = 0.22 [ 63 ], α A = 18.6 × 10 −6 K −1 , and α M = 13.9 × 10 −6 K −1 [ 64 ]. The volumetric effect of austenite→martensite transformation was derived from the equation: Δ V A → M = 2.5–1.08·(C γ %) [ 65 ] assuming a carbon content in austenite (C γ %) of 1.50 wt.%.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Microstructure, Tribological Characteristics, and Crack Behavior of a Chromium Carbide Coating Fabricated on Gray Cast Iron by Pulsed-Plasma Deposition

et al. 2021

View full text Add to dashboard Cite

The structural and tribological properties of a protective high-chromium coating synthesized on gray cast iron by air pulse-plasma treatments were investigated. The coating was fabricated in an electrothermal axial plasma accelerator equipped with an expandable cathode made of white cast iron (2.3 wt.% C–27.4 wt.% Cr–3.1 wt.% Mn). Optical microscopy, scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction analysis, microhardness measurements, and tribological tests were conducted for coating characterizations. It was found that after ten plasma pulses (under a discharge voltage of 4 kV) and post-plasma heat treatment (two hours of holding at 950 °C and oil-quenching), a coating (thickness = 210–250 µm) consisting of 48 vol.% Cr-rich carbides (M7C3, M3C), 48 vol.% martensite, and 4 vol.% retained austenite was formed. The microhardness of the coating ranged between 980 and 1180 HV. The above processes caused a gradient in alloying elements in the coating and the substrate due to the counter diffusion of C, Cr, and Mn atoms during post-plasma heat treatments and led to the formation of a transitional layer and different structural zones in near-surface layers of cast iron. As compared to gray cast iron (non-heat-treated and heat-treated), the coating had 3.0–3.2 times higher abrasive wear resistance and 1.2–1208.8 times higher dry-sliding wear resistance (depending on the counter-body material). The coating manifested a tendency of solidification cracking caused by tensile stress due to the formation of a mostly austenitic structure with a lower specific volume. Cracks facilitated abrasive wear and promoted surface spalling under dry-sliding against the diamond cone.

show abstract

“…In addition, the work function of a material is also dependent on other properties, of particular interest here is the Young's modulus as was demonstrated for polycrystalline metals (Hua and Li, 2011). In the case of ductile cast iron, the Young's modulus is a locally varying function due to the graphite nodules (Pereira et al, 2018;Speich et al, 1980) which in turn locally impacts the EWF. These considerations raised the expectation that the graphite nodules in ductile cast iron would affect corrosion mostly at the early stages.…”

Section: Panelmentioning

confidence: 99%

On the corrosion of ductile cast iron by sulphate reducing bacteria—implications for long-term nuclear waste repositories

Tamisier,

Musat,

Richnow

et al. 2023

Front. Geochem.

View full text Add to dashboard Cite

Ductile cast iron is a candidate material for long term nuclear waste repository canisters. However, little is known about microbial corrosion of this material, a phenomenon threatening the integrity of the repository. Here, the corrosion of ductile cast iron (92.73%–94.19% Fe) and mild steel (∼99.37% Fe) by the sulphate reducing bacterium Desulfopila corrodens were compared. Particular attention was payed to the impact of graphite nodules in ductile cast iron on the corrosion. The two materials developed similar crusts after 36 days. However, in the early corrosion stages different mineral compositions of the formed crusts were observed, e.g., dome shaped minerals (<1 µm) that formed on mild steel were absent on ductile cast iron. Further, iron sulphide was formed equally on all surfaces, the iron and graphite nodules. Our results contribute to the understanding of how microbial activity drives the corrosion of ductile cast iron made structures (e.g., canisters) in long-term nuclear waste repositories, particularly with respect to the mineral composition of the crust at different stages of the corrosion process. We propose that under the conditions used in this study, the ductile cast iron and mild steel bio-corrode similarly on long time scales which makes both material not favourable for use in long term nuclear waste repository with regard to microbial corrosion.

show abstract

Estimating the Effective Elastic Parameters of Nodular Cast Iron from Micro-Tomographic Imaging and Multiscale Finite Elements: Comparison between Numerical and Experimental Results

Cited by 12 publications

References 28 publications

Influence of CoFeB layer thickness on elastic parameters in CoFeB/MgO heterostructures

Influence of CoFeB layer thickness on elastic parameters in CoFeB/MgO heterostructures

Evaluation of the Microstructure, Tribological Characteristics, and Crack Behavior of a Chromium Carbide Coating Fabricated on Gray Cast Iron by Pulsed-Plasma Deposition

On the corrosion of ductile cast iron by sulphate reducing bacteria—implications for long-term nuclear waste repositories

Contact Info

Product

Resources

About