Effects of titanium addition and section size on microstructure and mechanical properties of compacted graphite cast iron

Shy, Yih-Hsun; Hsu, Cheng-Hsun; Lee, Shen-Chih; Hou, Chih-Yuan

doi:10.1016/s0921-5093(99)00599-7

Cited by 31 publications

(8 citation statements)

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“…1), thus meeting standards both the Polish PN and American ASTM. According to the work [15], the addition of 0.15% titanium increases the vermicular graphite fraction in castings with a wall thickness of 30-80 mm only by approximately 10%, and has a negligible impact on the mechanical properties. This study shows that the use of 0.13% Ti in thin-walled castings has a much stronger effect on the solidification of vermicular graphite in comparison with castings with thicker sections.…”

Section: Microstructurementioning

confidence: 99%

“…Foundry practice and good production discipline could not be sufficient to maintain the consistency of the desired microstructure without the use of antispheroidizing elements such as titanium. The literature provides limited data [5,14,15] dealing with the influence of titanium addition on high cooling rate-structure relations of VGCI, which is a crucial property in the formation of thin-walled castings. This article presents an analysis of the addition of Ti on the microstructure and mechanical properties of thin-walled castings.…”

Section: Introductionmentioning

confidence: 99%

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Role of Titanium in Thin Wall Vermicular Graphite Iron Castings Production

Górny

Kawalec

2013

Archives of Foundry Engineering

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In this paper the effects of titanium addition in an amount up to 0.13 wt.% have been investigated to determine their effect on the microstructure and mechanical properties of Thin Wall Vermicular Graphite Iron Castings (TWVGI). The study was performed for thinwalled iron castings with 3-5 mm wall thickness and for the reference casting with 13 mm. Microstructural changes were evaluated by analyzing quantitative data sets obtained by image analyzer and also using scanning electron microscope (SEM). Metallographic examinations show that in thin-walled castings there is a significant impact of titanium addition to vermicular graphite formation. Thinwalled castings with vermicular graphite have a homogeneous structure, free of chills, and good mechanical properties. It may predispose them as a potential use as substitutes for aluminum alloy castings in diverse applications.

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Section: Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Role of Titanium in Thin Wall Vermicular Graphite Iron Castings Production

Górny

Kawalec

2013

Archives of Foundry Engineering

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“…On the other hand, alloying is likely to be an easy way to improve the properties of CGI. Copper, titanium, and tin were found to be effective in increasing the strength of CGI by promoting the formation of pearlite [17][18][19], but the influences of these alloys to the wear resistance of CGI is not fully understood.…”

Section: Introductionmentioning

confidence: 99%

Abrasive Wear of Compacted Graphite Cast Iron with Added Tin

Lyu

2018

Metallogr. Microstruct. Anal.

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The abrasive wear behavior of traditional compacted graphite cast iron (CGI) and compacted graphite cast iron with 0.1% tin addition (CGI-Sn) is studied using a pin-on-disk tribometer. The microstructures of these two CGIs were observed by optical microscopy and scanning electron microscopy. The results show that Sn reduces the average size of vermicular graphite and promotes the generation of pearlite. Sn narrows the average lamellar spacing of pearlite. In the wear tests, CGI-Sn yields a decreased wear loss by 16.5% compared with CGI. Both CGI and CGI-Sn show typical abrasive worn morphology, while CGI presents a more severe wear condition in which large fragmentations can be seen. Under the current test condition, Sn is likely to improve the abrasive wear resistance of compacted graphite iron. Further studies of the specific working conditions are needed, such as testing against frictional material in braking systems, to check the validity of the findings.

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“…[1][2][3][4][5][6] Compacted graphite iron (CGI) is a cast iron that has received much attention during recent years due to its mechanical and physical properties that usually are intermediate between those of gray cast iron and nodular cast iron. [7][8][9][10][11] Even though CGI has lower thermal conductivity than gray cast iron, the higher strength of CGI makes it a promising material for engine components.…”

Section: Introductionmentioning

confidence: 99%

Tensile and Thermal Properties in Compacted Graphite Irons at Elevated Temperatures

Selin

2010

Metall Mater Trans A

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Tensile and thermal properties of compacted graphite irons (CGIs), prepared with various molybdenum additions and solidification rates, have been investigated for temperatures between room temperature and 873 K (600°C). A slower solidification rate resulted in larger and fewer graphite particles as well as in an increase of intercellular cementite, or carbides. Molybdenum is a carbide stabilizing element; i.e., increasing additions of molybdenum increased the amount of carbides. Young's modulus decreased with increasing temperature, and a lower solidification rate increased this parameter slightly. Both increasing content of carbide and increasing nodularity increased the Young's modulus. Strength parameters such as yield strength and ultimate tensile strength (R m ) were affected in similar ways by temperature and solidification rate. The strength values were generally quite temperature independent for temperatures below 573 K (300°C) but decreased rapidly for higher temperatures. Increasing nodularity increased the strength, while increasing content of carbide had little influence on the values. The thermal conductivity decreased with increasing content of carbide and increasing nodularity. The thermal conductivity generally showed a maximum value at 573 K (300°C). A contradictory linear relationship was found between yield strength and thermal conductivity.

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Effects of titanium addition and section size on microstructure and mechanical properties of compacted graphite cast iron

Cited by 31 publications

References 0 publications

Role of Titanium in Thin Wall Vermicular Graphite Iron Castings Production

Role of Titanium in Thin Wall Vermicular Graphite Iron Castings Production

Abrasive Wear of Compacted Graphite Cast Iron with Added Tin

Tensile and Thermal Properties in Compacted Graphite Irons at Elevated Temperatures

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