An Experimental Study on Comparison of Wear Properties of Cast Irons with Compacted Graphite and Spheroidal Graphite

The optimal alloy design and microstructure for the high temperature (around 800oC) constrained cyclic thermal fatigue applications in thin-section ductile irons have been established previously by the authors. This study intends to investigate the effect of graphite morphology on the thermal fatigue property of thin-section (2mm ~ 6mm) graphitic cast irons. The results show that to produce carbide-free spheroidal graphite irons in relatively thin sections of 2-mm or 3-mm in the as cast conditions is feasible. However, for compacted graphite cast irons, graphite particles largely in nodular form always occurs in rather thin sections, and acceptable compacted graphite structure can only be obtained when the section thickness exceeds about 6-mm. Regarding the constrained cyclic thermal fatigue property (20 ~ 800oC), cast irons with spheroidal graphite exhibit the best thermal fatigue life, which is followed by irons with compacted graphite, and then flake graphite cast irons, even though flake graphite cast irons show least swelling or distortion after cyclic thermal fatigue test. Furthermore, adding some 0.5%Mo to the irons significantly improves the thermal fatigue property, in some cases even by a factor of 2, implying that the role of Mo outweighs the influence of graphite structure in promoting thermal fatigue property.

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Microstructure, Hardness and Wear Properties of Sintered Fe-Mo-Si-C Steels with Spheroidal Graphite Iron/Compacted Graphite Iron-Like

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.751.47 ◽

2017 ◽

Vol 751 ◽

pp. 47-52 ◽

Cited By ~ 2

Author(s):

Kittikhun Ruangchai ◽

Amporn Wiengmoon ◽

Monnapas Morakotjinda ◽

Rungtip Krataitong ◽

Dhritti Tanprayoon ◽

...

Keyword(s):

Friction Coefficient ◽

Graphite Powder ◽

Spheroidal Graphite ◽

Carbide Powder ◽

Volume Loss ◽

Wear Properties ◽

Compacted Graphite ◽

Ferrite Fraction ◽

Fraction Increase ◽

Shell Particles

Sintered Fe-Mo-Si-C steels were prepared from pre-alloyed Fe-0.85Mo powder added with fixed 4wt.% silicon carbide powder and varied graphite powder contents. It was found that the graphite powder addition caused morphological change from black nodular to black vermicular particles and resulted in decrease of black nodular/vermicular particle fraction, increase of pearlite fraction and slight change of ferrite fraction. The black nodular particles were either graphite or Fe-Mo-Si-C/graphite core-shell particles whereas vermicular particles were totally composed of carbon. The microstructural features showed influence on mechanical property of the sintered Fe-Mo-Si-C alloys. Wear properties of the sintered steels were strongly affected by their microstructural components. The sintered Fe-0.85Mo+4wt.%SiC steels showed highest friction coefficient and volume loss. Addition of graphite to the sintered Fe-0.85Mo+4wt.%SiC steels, not only changed morphology and chemistry of black particles but also reduced friction coefficient and volume loss. The reduction of both determined wear properties were attributed to the presence of vermicular graphite particles.

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Comparison of austempering transformation in spheroidal graphite and compacted graphite cast irons

International Journal of Cast Metals Research ◽

10.1179/136404606225023363 ◽

2006 ◽

Vol 19 (3) ◽

pp. 151-155 ◽

Cited By ~ 3

Author(s):

M. Ramadan ◽

A. A. Nofal ◽

I. Elmahalawi ◽

R. Abdel-Karim

Keyword(s):

Spheroidal Graphite ◽

Cast Irons ◽

Compacted Graphite

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MEEHANITE GB300

Alloy Digest ◽

10.31399/asm.ad.ci0075 ◽

2020 ◽

Vol 69 (11) ◽

Keyword(s):

Thermal Conductivity ◽

Tensile Strength ◽

Compressive Strength ◽

Gray Cast Iron ◽

High Strength ◽

Heat Treating ◽

Spheroidal Graphite ◽

Cast Irons ◽

Test Pieces ◽

Temperature Performance

Abstract Meehanite GB300 is a pearlitic gray cast iron that has a minimum tensile strength of 300 MPa (44 ksi), when determined on test pieces machined from separately cast, 30 mm (1.2 in.) diameter test bars. This grade exhibits high strength while still maintaining good thermal conductivity and good machinability. It is generally used for applications where the thermal conductivity requirements preclude the use of other higher-strength materials, such as spheroidal graphite cast irons, which have inferior thermal properties. This datasheet provides information on physical properties, hardness, tensile properties, and compressive strength as well as fatigue. It also includes information on low and high temperature performance as well as heat treating, machining, and joining. Filing Code: CI-75. Producer or source: Meehanite Metal Corporation.

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Founding � Ausferritic spheroidal graphite cast irons � Classification

10.3403/30078817u ◽

2020 ◽

Keyword(s):

Spheroidal Graphite ◽

Cast Irons

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An experimental study of metastable graphitization of cast irons

Metal Science and Heat Treatment ◽

10.1007/bf02467471 ◽

1998 ◽

Vol 40 (3) ◽

pp. 115-118

Author(s):

G. I. Sil’man ◽

A. A. Zhukov ◽

Yu. V. Zhavoronkov

Keyword(s):

Experimental Study ◽

Cast Irons

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ISO 185/JL/350

Alloy Digest ◽

10.31399/asm.ad.ci0085 ◽

2021 ◽

Vol 70 (9) ◽

Keyword(s):

Thermal Conductivity ◽

Tensile Strength ◽

Cast Iron ◽

Gray Cast Iron ◽

High Strength ◽

Heat Treating ◽

Gray Cast ◽

Spheroidal Graphite ◽

Cast Irons ◽

Test Pieces

Abstract ISO 185/JL/350 is a higher-tensile-strength gray cast iron that has a pearlitic matrix, and a tensile strength of 350–450 MPa (51–65 ksi), when determined on test pieces machined from separately cast, 30 mm (1.2 in.) diameter test bars. It provides a combination of high strength while still maintaining good thermal conductivity compared with other types of cast iron. This grade approaches the maximum tensile strength attainable in gray cast iron. Applications therefore tend to be confined to those where thermal conductivity requirements in service preclude the use of one of the other higher-strength materials such as spheroidal graphite cast irons, which have inferior thermal properties. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on wear resistance as well as casting and heat treating. Filing Code: CI-85. Producer or source: International Organization for Standardization.

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Semisolid Forging of Cast Iron Using Rapid Resistance Heating

Materials Science Forum ◽

10.4028/www.scientific.net/msf.561-565.925 ◽

2007 ◽

Vol 561-565 ◽

pp. 925-928 ◽

Cited By ~ 1

Author(s):

Seijiro Maki ◽

Kazuhito Suzuki ◽

Kenichiro Mori

Keyword(s):

Cast Iron ◽

Control Function ◽

Electric Energy ◽

Spheroidal Graphite ◽

Pig Iron ◽

Resistance Heating ◽

Cast Irons ◽

Ac Power ◽

Spheroidal Graphite Cast Iron ◽

Graphite Cast Iron

Feasibility of semisolid forging of cast iron using rapid resistance heating was experimentally investigated. Gray pig iron FC250 and spheroidal graphite cast iron FCD600, whose carbon equivalents are both 4.3% in mass, were used for the experiments. Since these cast irons have a narrow semisolid temperature range, an AC power supply with an input electric energy control function was used. In this study, the resistance heating characteristics of the cast irons were firstly examined, and then their semisolid forging experiments were conducted. In the forging experiments, the conditions of the forgings such as microstructures and hardness properties were examined, and the feasibility of the semisolid forging of cast iron using resistance heating was discussed. As a result, it was found that the method presented here is highly feasible.

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