Defect formation mechanisms in lamellar graphite iron related to the casting geometry

Diószegi, Attila; Svidró, Péter; Elmquist, Lennart; Dugic, Izudin

doi:10.1080/13640461.2016.1211579

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…Inside this container equiaxed grains are formed, based on heterogeneous nucleation. The grain growth continues until the columnar and equiaxed grains collide and form a coherent skeleton of a metallic matrix [1]. Depending on the dendrite morphology at the collision, a significant fraction of liquid phase still exists between the dendrite arms (intradendritic liquid) and in between the austenite grains (extradendritic liquid).…”

Section: Introductionmentioning

confidence: 99%

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Determination of pressure in the extradendritic liquid area during solidification

Svidró

Diószegi

Jönsson

et al. 2018

J Therm Anal Calorim

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Complex-shaped lamellar graphite iron castings are susceptible to casting defects related to the volume change during solidification. The formations of these recurring defects are caused by the flow of the liquid in the intradendritic area, between the austenite dendrite arms, and in the extradendritic area between the austenite grains. The conditions for the liquid flow, in turn, are determined by the solidification behavior. The present study suggests a new measurement method and a novel calculation algorithm to determine the pressure of the extradendritic liquid during solidification. The method involves a spherical sample suspended in a measurement device, where the temperature and the volume changes are measured during solidification. The calculation algorithm is based on the numerical interpretation of the ClausiusClapeyron equation where the temperature variation, the volume change and the released latent heat are processed to determine the local pressure of the extradendritic liquid area during solidification.

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Section: Introductionmentioning

confidence: 99%

“…Two frequently occurring defects were studied, namely the shrinkage porosity (SP) and the metal expansion penetration (MEP) [1] (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Determination of pressure in the extradendritic liquid area during solidification

Svidró

Diószegi

Jönsson

et al. 2018

J Therm Anal Calorim

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“…Additionally, cast iron materials also have many advantageous properties such as the inexpensiveness and easiness of the melting process, good fluidity, low melting points, and thermal conductivity. These superior properties of cast irons allow them to be prevalently used in several structural applications and the automotive industry [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…At the stages before the pouring process, the structure of lamellar graphite (gray) cast irons is dependent on the cooling conditions, inoculants, and chemical compositions [6]. In the automotive industry, lamellar graphite (gray) cast iron materials are frequently used in the production of blocks, brake drums and disks, engines, piston rings, cylinder heads, and cyl-inder linings [4,5,7,8]. In this study, Tantalum Carbide (TaC) was added at different ratios (sample K: 0%, sample A: 0.025%, sample B: 0.155%, and sample C: 0.285%) to lamellar graphite cast irons that are prevalently use in the industry, and these samples were subjected to compressive tests, hardness tests, and microstructural analyses.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the microstructure, hardness, and compressive properties of TaC-reinforced lamellar graphite cast irons

Yakut

ÇİFTÇİ²

2023

European Mechanical Science

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Tantalum Carbide (TaC) reinforcement was made to lamellar graphite (gray) cast irons that were produced in the physical conditions of a foundry at reinforcement ratios of 0%, 0.025%, 0.155%, and 0.285%. Samples complying with standards were prepared using the TaC-reinforced lamellar graphite (gray) cast iron alloys that were produced, and Brinell hardness tests, compressive strength tests, and microstructural analyses were conducted. According to the test results, the highest average Brinell hardness value was found as 231 HB in sample A which was reinforced at a ratio of 0.025%. In general, as the reinforcement ratio increased, there was an increase in the hardness test measurement results. The highest average compressive strength value was found as 949 MPa in sample C which was reinforced at a ratio of 0.285%. In general, as the reinforcement ratio increased, there was an increase in the compressive strength values. The results of the microstructural analyses showed that the reinforcement material was dispersed into the matrix.

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“…Grey (lamellar graphite) cast irons (GCI) are the most commonly used cast materials for engineering purposes. They are widely used because they have many advantages, such as a high heat capacity, high thermal conductivity [8,9], a low melting point [10], high vibration damping, hardness, superior wear resistance [11] and good machinability [12]. These materials have a compressive strength, dimensional stability and tensile strength comparable to steel [11].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mechanical Properties of Grey Cast Irons Reinforced with Carbon Titanium Nitride (TiNC)

Yakut

2023

Lubricants

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In this study, grey cast iron (GG25) was produced via reinforcement with carbon titanium nitride (TiNC) in different amounts (0%, 0.153%, 0.204% and 0.255%). Samples were made from this material according to the standards for hardness, compression and wear, and then experiments were conducted. The test conditions applied for the TiNC-reinforced samples were similarly applied to unreinforced samples. The TiNC-reinforced and unreinforced samples were compared regarding their compression, hardness, and wear properties. The results of the hardness tests showed the highest average hardness value of 215 HB for sample A (0% TiNC). For TiNC-reinforced specimens, the hardness values of the reinforced specimens increased with increasing reinforcement. Sample B (0.153% TiNC) had an average hardness value of 193 HB. For sample C (0.204% TiNC), an average hardness value of 200 HB was measured. For sample D (0.255% TiNC), an average hardness value of 204 HB was determined. Sample A’s highest compression strength value was 780 MPA (0% TiNC). Similar to the hardness test values, the compression strength of the reinforced samples increased with the increasing reinforcement rate. The compression test value was found to be 747 MPa for sample B (0.153% TiNC), 765 MPa for sample C (0.204% TiNC) and 778 MPa for sample D (0.255% TiNC). Wear tests were performed on all samples to examine changes in the wear volume loss, wear rate and friction coefficients. Scanning electron microscopy (SEM) was used to determine the wear mechanisms on the worn surfaces of the samples. When examining the wear condition of the samples with the same hardness value as a function of increasing load values, increases in the wear volume loss values were observed as the load value increased.

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Defect formation mechanisms in lamellar graphite iron related to the casting geometry

Cited by 6 publications

References 8 publications

Determination of pressure in the extradendritic liquid area during solidification

Determination of pressure in the extradendritic liquid area during solidification

Investigation of the microstructure, hardness, and compressive properties of TaC-reinforced lamellar graphite cast irons

Investigation of Mechanical Properties of Grey Cast Irons Reinforced with Carbon Titanium Nitride (TiNC)

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