Effect Of Natural Convection On Directional Solidification Of Pure Metal

Skrzypczak, Tomasz; Węgrzyn-Skrzypczak, Ewa; Winczek, Jerzy

doi:10.1515/amm-2015-0215

Cited by 12 publications

(5 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Probe with maximal frequency of 2.25 MHz can be used to testing of this ring. However, with decreasing frequency, control sensitivity on internal defects decreases [1,6,11].…”

Section: Fig 3 the Principle Of Attenuation Determiningmentioning

confidence: 99%

See 1 more Smart Citation

Archives of Metallurgy and Materials

Konar¹,

Mičian²

2019

View full text Add to dashboard Cite

Internal casting defects that are detected by radiography may also be detected by ultrasonic method. Ultrasonic testing allows investigation of the cross-sectional area of a casting, it is considered to be a volumetric inspection method. The high frequency acoustic energy travels through the casting until it hits the opposite surface or an interface or defect. The interface or defect reflects portions of the energy, which are collected in a receiving unit and displayed for the analyst to view. The pattern of the energy deflection can indicate internal defect. Ultrasonic casting testing is very complicated in practice. The complications are mainly due to the coarse-grain structure of the casting that causes a high ultrasound attenuation. High attenuation then makes it impossible to test the entire volume of material. This article is focused on measurement of attenuation, the effect of probe frequency on attenuation and testing results.

show abstract

“…Probe with maximal frequency of 2.25 MHz can be used to testing of this ring. However, with decreasing frequency, control sensitivity on internal defects decreases [1,6,11].…”

Section: Fig 3 the Principle Of Attenuation Determiningmentioning

confidence: 99%

“…1), which was on the edge of the casting. Calibration was performed based on the position of the first and second end echo on the screen flaw of defectoscope Olympus OmniScan MX2 using the setting wedge delay and velocity [4,11].…”

Section: The Effect Of Frequency On the Attenuation Changementioning

confidence: 99%

Archives of Metallurgy and Materials

Konar¹,

Mičian²

2019

View full text Add to dashboard Cite

show abstract

“…In terms of usability, grey cast iron is the most widely used casting material, but spheroidal graphite cast iron is a full-featured foundry material for more complex and more stressed parts, where it partially replaces steel castings. After the thermal treatment of ductile cast iron, an auspicious structure can be obtained, which has comparable mechanical properties to steel and its production is less demanding for raw materials and energy [6,7].…”

Section: Properties Of Ductile Cast Ironmentioning

confidence: 99%

Archives of Foundry Engineering

Kantoríková

2019

View full text Add to dashboard Cite

The article describes the detection of a defect in a cast iron casting. It analyzes the cause of the crack in the Turbine Component casting. In this article, we are focusing on a particular turbine casting that is commonly used in automobiles as one of the components for turbochargers. The turbine is a casting made of ductile cast iron with a visible crack on the naked eye. The formation of cracks in castings is a common but undesirable phenomenon in the foundry practice. It is important to identify the errors, but also to know the cause of defects in castings. The solution is a detailed error analysis. In this paper I used metallographic analysis and magnetic powder method. The crack formation is due to tension in the casting, which results in tensile, shear, or shear forces. The crack formation kinetics is difficult because it is still very low during hardening and shortly after the casting is overloaded. The crack is most often due to core resistance or shrinkage molds that begin after the surface layer is tightened when the strength of the material is negligible to the end of the crystallisation.

show abstract

“…Many physical processes that takes place from micro scale up to macro adds present significant difficulties, when someone tries to prepare suitable computational model. During years, many researchers came with models, that could give reasonable results [1,2].…”

Section: Introductionmentioning

confidence: 99%

A computer simulation of solidification taking into account the movement of the liquid phase

2018

View full text Add to dashboard Cite

In the paper, we present the results of solidification simulation taking into account the movement of the liquid phase. The results are obtained from an author software which is implemented on the base of a stabilized finite elements method (Petrov-Galerkin formulation). Using that formulation the Navier-Stokes equation is solved together with the convection term (Boussinesq approximation). The Finite Element Method (FEM) formulation is responsible for solidification, approximating the solution of the heat conduction equation (with the internal heat source term responsible for the heat released during the phase transition). The movement of the liquid phase in a solidifying cast that is caused by convection can significantly affect the process of heat transfer from the casting to the mold, which in turn has an influence on the temperature distribution in the cast and may cause a change in the location of the defects. The presented results allow to assess under what conditions the effect of convection on the solidification process is significant.

show abstract

Effect Of Natural Convection On Directional Solidification Of Pure Metal

Cited by 12 publications

References 31 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Archives of Foundry Engineering

A computer simulation of solidification taking into account the movement of the liquid phase

Contact Info

Product

Resources

About