Influence of Ti on Graphite Morphological Transition in Flake Graphite Cast Iron

Nakae, Hideo; Fujimoto, K.

doi:10.4028/www.scientific.net/kem.457.25

Cited by 11 publications

(7 citation statements)

References 4 publications

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“…These components have often been made from non-ferrous materials; however, they are generally more expensive than gray cast iron, and do not share its excellent castability, machinability and vibration damping characteristics [1][2][3][4][5][6]. This means that if gray cast iron components can be made thinner, then similar weight savings can be achieved as with nonferrous castings, but with superior performance [7,8].…”

Section: Introductionmentioning

confidence: 93%

Fabrication of High-Strength Gray Cast Iron Using Permanent Magnet Scrap

Park

Kim

Seo

et al. 2017

Archives of Metallurgy and Materials

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In this study, we have developed the manufacturing technology for high strength gray cast irons by using the spent permanent magnet scraps. The cast specimen inoculated by using a spent magnet scraps showed the excellent tensile strength up to 306MPa. This tensile strength value is 50MPa higher than that of the specimen cast without inoculation, and is similar to that of the specimen inoculated by using the expensive misch-metal. These superior mechanical properties are attributed to complex sulfides created during solidification that promote the formation and growth of Type-A graphite. It is therefore concluded that spent magnets scrap can provide an efficient and cost-effective inoculation agent for the fabrication of high-performance gray cast iron.

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Section: Introductionmentioning

confidence: 93%

Fabrication of High-Strength Gray Cast Iron Using Permanent Magnet Scrap

Park

Kim

Seo

et al. 2017

Archives of Metallurgy and Materials

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“…After adding a small amount of Sn, Ti and W into the matrix, new graphite flakes appear in the "interdendrite" of the pearlite matrix, showing obvious segregation but random direction. Ti in an alloy controls solidification and promotes segregation of microstructure [15] . Therefore, the formation of super cooled D-type graphite flakes are related to Ti [16] .…”

Section: Microstructurementioning

confidence: 99%

Effect of alloying elements W, Ti, Sn on microstructure and mechanical properties of gray iron 220

et al. 2019

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G ray cast iron is being widely used in the industrial market due to its low price and excellent properties such as low melting temperature, minimum shrinkage, deformation resistance and corrosion resistance [1,2] . Over the past decade, more than 70% of the world's cast materials are gray cast iron [1] . However, gray cast iron has poor tensile strength, high brittleness and high density compared with new iron alloys. These disadvantages may hinder the use of gray cast iron in many specific applications [2] . However, the tensile strength can be improved through optimum selection of iron compositions, casting method, and sintering phenomenon [3] . Recently, the tensile strength of gray cast iron has been improved significantly by adding small amounts of alloying elements to the iron's matrix to control the microstructure. These alloying elements are Abstract: Experiments were carried out to observe the variation in microstructure and mechanical properties of gray cast iron by adding pearlite promoting alloying elements such as Ti, Sn and W. Results show that adding Sn, Ti, and W with different concentrations improve the microstructure, Brinell hardness and tensile strength of gray cast iron. With the increase of alloying element concentration, the average graphite length and graphite content increase linearly. At the same time, average cell size and the maximum graphite length also decrease linearly. Brinell hardness and tensile strength of gray cast iron also increase with an increase in alloying elements contents, and attain the maximum when Ti = 0.561%, Sn = 0.561% and W = 0.945%. However, at higher concentrations of Ti = 0.810%, Sn = 0.631% and W = 1.351%, the tensile strength decreases from 333 MPa to 297 MPa and the Brinell hardness decreases from 248 HB to 225 HB. The decrease in tensile strength and Brinell hardness at the higher concentration level is attributed to the formation of coarse and thick graphite flakes.

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“…냉각곡선은 응고 및 상변태 과정의 전반적인 정보를 내포하 고 있으며, 냉각곡선을 잘 분석하여 미세조직, 특성 및 결함 등을 예측할 수 있다 [7,12,[19][20][21][22]. 아공정주철(Hypoeutectic 3.…”

Section: 시 가격 상승을 최소화 하면서 칠 조직을 억제하기 위해서는unclassified

Analysis of Eutectic Reaction as a Function of Cooling Rate in High Manganese Flake Graphite Cast Irons

Lee¹,

Lee²,

Lee³

2013

Journal of the Korea Foundry Society

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The effects of Mn content and cooling rate on the eutectic reaction of flake graphite cast irons were studied by a combined analysis of macro/micro-structure and cooling curve data. The correlation between the eutectic reaction parameter and macro/microstructure was systematically investigated. Two sets of chemical compositions with different Mn contents were designed to cast. Three types of molds for cylindrical specimens with different diameters were prepared to analyze the cooling rate effect. The difference between undercooling temperature and cementite eutectic temperature (∆T 1 = T U − T E,C ), which is decreased by increasing the Mn content or increasing the cooling rate, is considered to be a suitable eutectic reaction parameter for predicting graphite morphology. According to the criterion, A-type graphite is mainly suggested to form for ∆T 1 over 20 o C, and D-type graphite is mainly suggested to form for ∆T 1 below 0 o C. Eutectic reaction time (∆t), which is increased by increasing the Mn content and decreased by increasing the cooling rate, is regarded as a suitable eutectic reaction parameter for predicting eutectic cell size. Eutectic cell size is found to decrease in proportion to the decrease of ∆t.

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Influence of Ti on Graphite Morphological Transition in Flake Graphite Cast Iron

Cited by 11 publications

References 4 publications

Fabrication of High-Strength Gray Cast Iron Using Permanent Magnet Scrap

Fabrication of High-Strength Gray Cast Iron Using Permanent Magnet Scrap

Effect of alloying elements W, Ti, Sn on microstructure and mechanical properties of gray iron 220

Analysis of Eutectic Reaction as a Function of Cooling Rate in High Manganese Flake Graphite Cast Irons

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