Mixed graphite cast iron for automotive exhaust component applications

Li, Delin

doi:10.1007/s41230-017-7080-4

Cited by 7 publications

(3 citation statements)

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“…Due to its advantages of rapidity, simplicity and accuracy, the thermal analysis method is widely used in foundries for purposes such as the determination of carbon equivalent and carbon silicon content in molten iron, the evaluation of graphite morphology in nodular graphite cast iron, and the prediction of the chemical composition and mechanical properties of gray cast iron [9][10][11]. Presently, it is also one of the most common methods that can be used to quickly predict the vermiculation and inoculation effect in vermicular graphite cast iron [12], but its insufficient prediction accuracy and slow prediction speed are urgent problems to be solved.…”

Section: Introductionmentioning

confidence: 99%

Influence of FeS2 and FeSi75 in Double-Chamber Sample Cup on Thermal Analysis Curve and Graphite Morphology of Molten Iron

An-li

Tian

Shi

et al. 2023

Metals

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In the production of vermicular graphite cast iron, the allowable range of residual magnesium content in molten iron after treatment is very narrow, amounting to only 0.008%. Therefore, thermal analysis technology was used to quickly evaluate the vermiculation and inoculation level of molten iron at the furnace itself, thus allowing the molten iron to be adjusted in time. The additives in the sample cups play a crucial role in obtaining cooling curves with remarkable characteristics. In this study, either FeS2 or FeSi75 additives were added to one chamber of a double-chamber sample cup made of resin sand, in which the cavities of the double chambers were spherical with diameters of 30 mm. The thermal analysis curves of molten iron in the double-chamber sample cup were acquired using a double channel temperature recorder, and the solidified spherical samples were analyzed quantitatively. The influence of FeS2 or FeSi75 additives on both the cooling curves of molten iron and the graphite morphology were investigated. The experiment’s results indicated that when 0.05% FeS2 is added to one chamber of the sample cup, the cooling curve changes to the solidification pattern of gray cast iron. The continuous increase in the FeS2 additive has little influence on the shape of cooling curves, and the graphite changes form from vermicular to flaked. When the amount of FeS2 is increased from 0.05% to 0.10%, the resulting graphite changes from D-type and E-type to A-type and B-type. When the amount of FeS2 reaches 0.20%, the morphology of graphite is short and thick. With the increase in the amount of FeSi75 additive, the amount of spherical graphite in the sample cup increases gradually, and the vermicularity decreases gradually from 89% to 46%. With the increase in FeSi75 additive from 0 to 0.45%, we observed that the average diameter of graphite decreases from 23 μm to 19 μm and then increases to 22 μm. The eutectic recalescence temperature shows a decreasing trend, and the cooling curve gradually changes from a hypoeutectic to a eutectic pattern. The addition of 0.05% FeS2 or 0.45% FeSi75 to one chamber is more appropriate for a double-chamber sample cup with two spherical cavities with diameters of 30 mm. This lays a foundation for the optimization of additives when using the double-chamber sample cup for thermal analysis of vermicular graphite cast iron.

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Section: Introductionmentioning

confidence: 99%

Influence of FeS2 and FeSi75 in Double-Chamber Sample Cup on Thermal Analysis Curve and Graphite Morphology of Molten Iron

An-li

Tian

Shi

et al. 2023

Metals

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“…A number of studies concerning the corrosion resistance of SiMo cast iron focus on a relatively short time of exposure to oxidation (500 h on average) [10]. These studies are conducted mainly in terms of the use of SiMo cast iron in automotive castings, as described by Rouczka [11] and many other authors [12][13][14][15][16][17]. SiMo cast iron is an increasingly popular material, and research on this material is also conducted with a focus on optimizing the manufacturing process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mo Addition on the Chemical Corrosion Process of SiMo Cast Iron

Stawarz

Nuckowski

2020

Materials

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The study was carried out to evaluate five SiMo cast iron grades and their resistance to chemical corrosion at elevated temperature. Corrosion tests were carried out under conditions of an actual cyclic operation of a retort coal-fired boiler. The duration of the study was 3840 h. The range of temperature changes during one cycle was in the range of 300-650 • C. Samples of SiMo cast iron with Si content at the level of 5% and variable Mo content in the range 0%-2.5% were used as the material for the study. The examined material was subjected to preliminary metallographic analysis using scanning microscopy and an Energy dispersive spectroscopy (EDS) system. The chemical composition was determined on the basis of a Leco spectrometer and a Leco carbon and sulfur analyzer. The examination of the oxide layer was carried out with the use of Scanning electron microscope (SEM), EDS, and X-ray diffraction (XRD) methods. It was discovered that, in the analyzed alloys, oxide layers consisting of Fe 2 O 3 , Fe 3 O 4 , SO 2 , and Fe 2 SiO 4 were formed. The analyzed oxide layers were characterized by high adhesion to the substrate material, and their total thickness was about 20 µm.

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“…1,2) The Mg 2 Si-based composite is a potential material for mechanical applications, such as automotive products, because the Mg 2 Si intermetallic compound exhibits a high melting temperature, low density, high hardness, low thermal expansion coefficient and reasonably high elastic modulus. 3) Mg 2 Si-based composites were also investigated for thermoelectric applications. [4][5][6][7][8][9] The Mg 2 Si/Si composites for thermoelectric applications were investigated due to their decreasing thermal conductivity by effective phonon scattering at the grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structural and photoluminescence properties of Mg₂Si/Si nanocomposites consisting of Si nanosheet bundles and Mg₂Si deposits

Huang

Tamaki

Yuan

et al. 2019

Jpn. J. Appl. Phys.

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Mg2Si/Si nanocomposites, consisting of Si nanosheet bundles and Mg2Si deposits formed on the Si nanosheet bundles, were formed by the thermal annealing of CaSi2 powders in MgCl2 vapor. Mg atoms are deposited on the Si nanosheet bundles, and the surface of the nanosheets were partially transformed into the Mg2Si phase during the thermal treatment. The Mg2Si/Si composites were also synthesized on Si(111) substrates. The structural and photoluminescence (PL) properties of the composites were characterized. The Mg2Si deposits were inhomogeneously distributed on the Si nanosheets. Furthermore, the Si-based nanosheets consisted of disordered thinner Si layers, and a disordered superlattice-like layered structural model is shown. The PL emissions in the visible region were clearly observed, and the temperature and the excitation intensity dependences of the emissions were characterized. It was found that the structural modification of the Si nanosheet bundles to form the composites with Mg2Si deposits affected the emission property of the Si nanosheets. The luminescence mechanism of the composite was discussed.

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Mixed graphite cast iron for automotive exhaust component applications

Cited by 7 publications

References 1 publication

Influence of FeS2 and FeSi75 in Double-Chamber Sample Cup on Thermal Analysis Curve and Graphite Morphology of Molten Iron

Influence of FeS2 and FeSi75 in Double-Chamber Sample Cup on Thermal Analysis Curve and Graphite Morphology of Molten Iron

Effect of Mo Addition on the Chemical Corrosion Process of SiMo Cast Iron

Synthesis, structural and photoluminescence properties of Mg₂Si/Si nanocomposites consisting of Si nanosheet bundles and Mg₂Si deposits

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Mixed graphite cast iron for automotive exhaust component applications

Cited by 7 publications

References 1 publication

Influence of FeS2 and FeSi75 in Double-Chamber Sample Cup on Thermal Analysis Curve and Graphite Morphology of Molten Iron

Influence of FeS2 and FeSi75 in Double-Chamber Sample Cup on Thermal Analysis Curve and Graphite Morphology of Molten Iron

Effect of Mo Addition on the Chemical Corrosion Process of SiMo Cast Iron

Synthesis, structural and photoluminescence properties of Mg2Si/Si nanocomposites consisting of Si nanosheet bundles and Mg2Si deposits

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Synthesis, structural and photoluminescence properties of Mg₂Si/Si nanocomposites consisting of Si nanosheet bundles and Mg₂Si deposits