Suppression of Elevated Temperature Brittleness in Spheroidal Graphite Cast Iron by Increasing Phosphorus Content

Elevated temperature brittleness (ETB) of spheroidal graphite (s-g) cast iron has been referred to as reduced ductility within an elevated temperature range and has been related to grain boundary brittleness. The phenomenon of ETB has not been yet clearly understood. In this study, the factor affecting on ETB was studied in terms of strain rate and chemical composition. A study was carried out on the influence of phosphorus on ETB by using laboratory-made heats containing different phosphorus contents. ETB indicated the marked decrease in ductility at around 673K. S-g cast iron containing low phosphorus content manifested ETB at temperatures between 650K and 700K. There was a consistent correlation between the fractional increases in intergranular fracture appearance and the decrease in elongation. The increase of phosphorus suppressed ETB and s-g cast irons containing phosphorus exceeding 0.030 % were found to be immune to ETB. It was found that ETB could be suppressed by reducing the ratio of magnesium and phosphorus to less than 1.5.

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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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Experimental Investigation of Twist Fatigue Characteristics on Piston Rings

International Journal of Vehicle Structures and Systems ◽

10.4273/ijvss.12.2.07 ◽

2020 ◽

Vol 12 (2) ◽

Author(s):

E. Pavithra ◽

Mahesh Dhakal ◽

Prithvi Hada ◽

N. Yuvaraj ◽

K. Sridhar

Keyword(s):

Cast Iron ◽

Internal Combustion Engines ◽

Piston Ring ◽

Spheroidal Graphite ◽

Piston Rings ◽

Cast Irons ◽

Spheroidal Graphite Cast Iron ◽

Graphite Cast Iron ◽

Grey Cast ◽

Fatigue Characteristics

Piston ring is one of the most important parts of the internal combustion engines. This paper investigates the mechanical and twist fatigue characteristics on different piston ring materials. The piston ring materials were chosen in this study such as grey cast irons (3740 and 6140), malleable cast iron (3929), spheroidal graphite cast iron (6139) and martensitic carbidic grey cast iron (6454). Twist fatigue test was conducted on different materials of piston rings in order to identify the suitable piston ring for the effective operation. Geometrical features and the mechanical properties were also assessed in different materials for the effectiveness of piston rings.

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Operational Degradation of Spheroidal Graphite Cast Iron EN GJS SiMo

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.270.27 ◽

2017 ◽

Vol 270 ◽

pp. 27-33

Author(s):

Břetislav Skrbek

Keyword(s):

Cast Iron ◽

High Temperature ◽

Critical Temperature ◽

Spheroidal Graphite ◽

Temperature Structure ◽

Cast Irons ◽

Alloyed Cast ◽

Spheroidal Graphite Cast Iron ◽

Graphite Cast Iron ◽

Operational Degradation

The specifics of low-alloyed cast irons after EN 16124 standard of type GJS SiMo for high temperature applications of exhaust tracts of internal combustion piston engines. Boundary exposition temperature. Structure failure of cast iron by temperature overloading. Metalography, SEM, XRD of overexposed exhaust pipelines. Failure reason hypothesis of useful properties by exceeding of critical temperature.

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Color Etching for Characterization the Grain Orientation in Spheroidal Graphite Cast Iron

Materials Science Forum ◽

10.4028/www.scientific.net/msf.537-538.389 ◽

2007 ◽

Vol 537-538 ◽

pp. 389-396 ◽

Cited By ~ 2

Author(s):

Ibolya Kardos ◽

Zoltán Gácsi ◽

Péter János Szabó

Keyword(s):

Cast Iron ◽

Crystallographic Orientation ◽

Grain Orientation ◽

Test Material ◽

Spheroidal Graphite ◽

Metallic Materials ◽

Additional Information ◽

Spheroidal Graphite Cast Iron ◽

Graphite Cast Iron ◽

Back Scattering

Color etching is a widely used technique for visualizing different phases in metallic materials. Its advantage to the traditional etching techniques is that it gives additional information within one phase, namely, the color shade of a given phase can change in a certain range. This paper demonstrates that, due to the physics of the color etching, the shade of a phase also depends on the crystallographic orientation of the investigated grain. As a test material, spheroidal graphite cast iron was used, and individual grain orientation was identified by automated electron back scattering diffraction (EBSD). Results showed that there is a strong correlation between grain orientation and the shades obtained by color etching.

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