Defect Formation of Gray Iron Casting

Diószegi, Attila; Elmquist, Lennart; Orlenius, Jessica; Dugic, Izudin

doi:10.1007/bf03355458

Cited by 11 publications

(4 citation statements)

References 3 publications

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“…Casting technology imposes design limitations, consisting in the design of a cast element with the most uniform thickness of walls and ribs. The use of different thicknesses and variable cross sections of elements can lead to the occurrence of adverse effects during the casting or cooling of the casting, such as, for example, shrinkage cavities [13]. This is a significant technological limitation leading to the need to adapt the shape of the structural element to the requirements of the casting process [14].…”

Section: Methodsmentioning

confidence: 99%

A Comparative Analysis of the Dynamic Strength Properties of the Long Guides of Intelligent Machines for a New Method of the Thermal Spraying of Polymer Concrete

et al. 2022

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The possibility of using polymer concrete for metal cutting machine beds is analyzed. A comparison of the structures of the machine beds made of polymer concrete and cast iron is made. The frequency of the body of the machine beds made of polymer concrete and cast iron is determined. An analysis of the stress–strain state under static loads is carried out. To increase resistance to wear, it is proposed to spray polymer concrete frames are proposed by the gas–thermal method. The installation of thermal spraying for guide machine beds is given. The optimal parameters for spraying the guides of the machine beds made of polymer concrete are established calculated using the finite element method for the guide beds of metal cutting machine tools using polymer concrete with gaseous coating. The manufacture of the foundation bed from polymer concrete increases the vibration resistance of the machine by 1.4 times. At the same time, the metal consumption of metal cutting machines will decrease by 60%. To increase the wear resistance of the frame guides, it is proposed to use thermal spraying with certain modes typical for polymer concrete. The installation of thermal spraying for bed guides is given. Calculating using the finite element method for the guide beds of metal cutting machines showed that the use of polymer concrete with a wear-resistant coating is justified.

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Section: Methodsmentioning

confidence: 99%

A Comparative Analysis of the Dynamic Strength Properties of the Long Guides of Intelligent Machines for a New Method of the Thermal Spraying of Polymer Concrete

et al. 2022

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“…The corresponding t AL and t ES values for the determination of the DSC are obtained via the corrected values of T AL and T ES . [16] Note. CE (%)=wt.%(C)+0.25wt.…”

Section: Modified Methods Of T Al and T Esmentioning

confidence: 99%

“…11a), but zoneⅡ of the lost-foam casting is slightly larger than that of the green sand casting. Therefore, lost-foam casting is in a more favorable position than green sand casting in reducing the hypoeutectic gray cast iron shrinkage cavity, as well as the macro shrinkage porosity and mechanical burnt-on sand tendency [16] . (3) Zone Ⅲ is a large solidification area in the range of the solidification temperature (from T AC to T ES ), and the temperature gradient is not too large, so it constitutes a typical mushy solidification area.…”

Section: Analysis Of Macro-solidification Process Characteristicsmentioning

confidence: 99%

Construction and analysis of dynamic solidification curves for non-equilibrium solidification process in lost-foam casting hypoeutectic gray cast iron

Xie

Zhu

2017

China Foundry

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P ioneer studies of the dynamic solidification curve (DSC) of castings date back to the late 1940s, when Ruddle from the British Institute of Metals measured the temperature field to analyze the solidification process of nonferrous alloy castings [1] . R. P. Dunphy et al from the Naval Research Laboratory in US [2] constructed the DSC of hypoeutectic gray cast iron based on thermodynamics. The changes of the liquidus temperature, eutectic temperature, and the solidus temperature of the castings Abstract: Most lost-foam casting processes involve non-equilibrium solidification dominated by kinetic factors, while construction of a common dynamic solidification curve is based on pure thermodynamics, not applicable for analyses and research of non-equilibrium macro-solidification processes, and the construction mode can not be applied to nonequilibrium solidification process. In this study, the construction of the dynamic solidification curve (DSC) for the nonequilibrium macro-solidification process included: a modified method to determine the start temperature of primary austenite precipitation (T AL ) and the start temperature of eutectic solidification (T ES ); double curves method to determine the temperature of the dendrite coherency point of primary austenite (T AC ) and the temperature of eutectic cells collision point (T EC ); the "technical solidus" method to determine the end temperature of eutectic reaction (T EN ). For this purpose, a comparative testing of the non-equilibrium solidification temperature fields in lost-foam casting and green sand mold casting hypoeutectic gray iron was carried out. The thermal analysis results were used to construct the DSCs of both these casting methods under non-equilibrium solidification conditions. The results show that the transformation rate of non-equilibrium solidification in hypoeutectic gray cast iron is greater than that of equilibrium solidification. The eutectic solidification region presents a typical mushy solidification mode. The results also indicate that the primary austenite precipitation zone of lost-foam casting is slightly larger than that of green sand casting. At the same time, the solid fraction (f s ) of the dendrite coherency points in lost-foam casting is greater than that in the green sand casting. Therefore, from these two points, lost-foam casting is more preferable for reduction of shrinkage and mechanical burntin sand tendency of the hypoeutectic gray cast iron. Due to the fact that the solidification process (from the surface to center) at primary austenite growth area in the lost-foam cylinder sample lags behind that in the green sand casting, the mushy solidification tendency of lost-foam casting is greater and the solidification time is longer. were used to describe the corresponding solidification process. So far, the DSC is widely adopted in studies of the characteristics of the macro-solidification process of cast iron, especially in the analysis of the difference between solidification and process characteristics of ductile cast iro...

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“…The mechanical and physical properties of this material depend on the shape and number of the graphite grains and microstructure of the metallic matrix. One of the important processing characteristics for the manufacturing of the DI castings is the density changes during solidification [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Cellular Automaton Simulation For Volume Changes Of Solidifying Nodular Cast Iron

Burbelko¹,

Gurgul²,

Guzik³

et al. 2015

Archives of Metallurgy and Materials

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Volume changes of the binary Fe-C alloy with nodular graphite were forecast by means of the Cellular Automaton Finite Differences (CA-FD) model of solidification. Simulations were performed in 2D space for differing carbon content. Dependences of phase density on temperature were considered in the computations; additionally density of the liquid phase and austenite were deemed as a function of carbon concentration. Changes of the specific volume were forecast on the base of the phase volume fractions and changes of phase density. Density of modeled material was calculated as weighted average of densities of each phase.Keywords: ductile iron, solidification modeling, specific volume change W pracy przedstawiono wyniki symulacji zmian gęstości żeliwa sferoidalnego w układzie dwuskładnikowym Fe-C, wykorzystując do tego celu model oparty na metodzie automatu komórkowego i różnic skończonych. Symulacje wykonane były dla dwuwymiarowej przestrzeni dla różnych zawartości węgla. Zmiany gęstości wszystkich faz uwzględniano jako zależności temperaturowe. Dodatkowo dla cieczy i austenitu uwzględniono też zależność gęstości od zawartości węgla. Przy obliczaniu zmian objętości właściwej układu brano pod uwagę gęstości poszczególnych faz oraz ich udział objętościowy.

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Defect Formation of Gray Iron Casting

Cited by 11 publications

References 3 publications

A Comparative Analysis of the Dynamic Strength Properties of the Long Guides of Intelligent Machines for a New Method of the Thermal Spraying of Polymer Concrete

A Comparative Analysis of the Dynamic Strength Properties of the Long Guides of Intelligent Machines for a New Method of the Thermal Spraying of Polymer Concrete

Construction and analysis of dynamic solidification curves for non-equilibrium solidification process in lost-foam casting hypoeutectic gray cast iron

Cellular Automaton Simulation For Volume Changes Of Solidifying Nodular Cast Iron

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