Effect of the cooling rate on the tensile strength of pearlitic lamellar graphite cast iron

Lima, Fábio Fernando; Bauri, Luiz Felipe; Pereira, Henrique Boschetti; Azevedo, César Roberto de Farias

doi:10.1080/13640461.2020.1822573

Cited by 6 publications

(2 citation statements)

References 45 publications

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“…High carbon ratios in cast irons lead to higher brittleness values. In practical applications, cast irons are known as Fe-C-Si (iron, carbon, and silicon) alloys that contain up to 3.5 silicon and up to 4.4% carbon [10][11][12]. In addition to these elements, manganese and lower ratios of sulfur and phosphorus can also be encountered [13].…”

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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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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“…These conditions should include chemical composition of the casting alloy, casting temperature and speed, gating and feeding system, cooling rate, size of castings, composition of facing sand and heap sand moulding mixtures etc.). Different moulds [1][2][3][4][5][6][7][8][9][10] or common mould for two or more castings [11][12][13][14][15][16] are usually used for investigation and comparison of pilot and control castings, meaning the same preset conditions of the effect of external factors on investigated castings. It does not allow to cast simultaneously pilot and con-trol castings with common gating and feeding system (from one side) and with individual cooling procedures (from other side).…”

Section: Introductionmentioning

confidence: 99%

Use of experimental casting equipment for research of castings crystallized through individual cooling procedures

Gabelchenko¹,

Belov²,

Kidalov³

et al. 2022

cisisr

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The research is devoted to development of experimental foundry pattern equipment, allowing to obtain two or more castings in a sand-loam mould; these casting are crystallized via individual cooling procedures within structurally sensitive intervals (dendrite, eutectic crystallization and recrystallization). Influence of scale factor is excluded in this case and it makes possible to obtain control and pilot castings, which have equal sizes; influence of chemical composition is excluded as well, because all castings located in a mould have common gating and feeding system. It provides the same temperature and casting speed for two or more castings in one mould with different compositions and technological properties of moulding mixtures for each of the comparing castings. Thereby, variable cooling rate, which is individual for each casting obtained in the experimental mould, remains the main factor having influence on forming of structure, mechanical and operating properties of cast metal. Possibility of investigation of rise of mechanical and operating properties of castings owing to only adjusting of cooling rate without use of alloying and modification appears in this case. Increase of the cooling rate in local temperature-time crystallization intervals is provided by blowing with cooling gases which are fed in the mould via the stand (receiver). Retarding of cooling rate occurs as a result of mould heating during thermal oxidizing destruction of exothermal carbon-containing additives which are specially introduced in the facing layer of moulding mixture. It is necessary to mention that variation of cooling rate can be conducted via the procedures which are individual for each casting located in the experimental mould. Developed and fabricated experimental foundry equipment was used for testing of the concrete cooling procedures of thin-walled castings made of grey cast iron. Pressure of cooling compressed air, which was fed during the process, and amount of exothermal carbon-containing additive, which was introduced in composition of the facing layer of moulding mixture for pilot castings were varied. As a result, the efficient cooling procedure was selected; it allowed to rise tensile strength for the pilot casting by 13 %, to improve cast iron quality (quality index) by 23 % and to increase structure dispersity of primary austenite by 21 % without introduction of alloying elements and modifiers in cast iron composition.

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On the Mechanical Properties and Thermal Conductivity of Compacted Graphite Cast Iron with Different Pearlite Contents

Ren

Jiang

Long

et al. 2023

J. of Materi Eng and Perform

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Effect of the cooling rate on the tensile strength of pearlitic lamellar graphite cast iron

Cited by 6 publications

References 45 publications

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

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

Use of experimental casting equipment for research of castings crystallized through individual cooling procedures

On the Mechanical Properties and Thermal Conductivity of Compacted Graphite Cast Iron with Different Pearlite Contents

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