Production of Austempered Gray Iron (AGI) Using Forced Air Cooling

Olawale, J. O.; Oluwaseguun, K. M.; Ezemenaka, D.; Adisa, S. B.

doi:10.1520/mpc20140024

Cited by 11 publications

(5 citation statements)

References 17 publications

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“…The increase in elemental magnesium concentrations can be attributed to the intrinsic spontaneous reactivity of ferro-magnesium alloys. This level of magnesium is known to promote vigorous melt reaction and reduction in recovery (Hatung et al, 2014;Olawale et al, 2014). For example, high magnesium content, greater than 10 wt.…”

Section: A Composition Of Calcined Cashew Nut Shell Ashmentioning

confidence: 99%

Investigation of the Nodularisation Propensity of Calcined Cashew-Nut Shell-Ash in Cast-Iron Melt Graphite

Sekunowo¹,

Ugboaja²,

Tiamiyu³

2021

Nig. J. Technol. Dev.

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Production of ductile iron using ferrosilicon-magnesium master alloy in melt treatment is currently fraught with challenges bothering on cost and availability. In this study the suitability of cashew nut shells ash (CNSA) as a viable alternative to magnesium master alloys employed in the treatment of molten cast iron for enhanced mechanical properties was studied. The carbonized CNSA used varied from 2-10 wt. % to treat different heat batches; CA1-CA5 containing varied amount of CNSA, CaO and FeSi in the molten cast iron. The cast samples were subjected to both mechanical characterisation (tensile, hardness and impact) and microstructural analysis using Instron electromechanical machine, impact tester and scanning electron microscope (SEM) coupled with energy dispersive spectroscope (EDS). Results show that the 8 wt. % CNSA addition demonstrated the best mechanical properties comparable to ASTM A536 ferritic ductile cast iron. Specifically, the 8 wt. % CNSA cast samples exhibited 433 MPa tensile strength, 144HRC hardness and ductility of 14.7%. Contributions to improved mechanical properties may be attributed to the development of sufficient fractions of graphite nodules during melt treatment with CNSA. These outcomes are a boost both to the production of quality ductile irons and a cleaner environment. Keywords: Nodularisation, ductile-iron, cashew-nut, ferrosilicon-magnesium alloy, mechanical properties

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Section: A Composition Of Calcined Cashew Nut Shell Ashmentioning

confidence: 99%

Investigation of the Nodularisation Propensity of Calcined Cashew-Nut Shell-Ash in Cast-Iron Melt Graphite

Sekunowo¹,

Ugboaja²,

Tiamiyu³

2021

Nig. J. Technol. Dev.

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“…Hsu and Chen [10] concluded that the enhancement of corrosion resistance in ADI was due to the presence of retained austenite as a result of austempering. Similar studies with GCI are also common where the corrosion resistance and the mechanical properties were improved dramatically by tailoring the heat treatment pattern (tempering, austempering, and quenching [11,12,13,14]) and by alloy additions [8]. Further improvement of the mechanical properties, compared to those of conventional GCI, was observed in austempered gray cast iron (AGCI) due to the formation of a matrix of ausferritic structures (ferrite and stabilized austenite) or bainitic ferrite during austempering [12,15].…”

Section: Introductionmentioning

confidence: 99%

“…Further improvement of the mechanical properties, compared to those of conventional GCI, was observed in austempered gray cast iron (AGCI) due to the formation of a matrix of ausferritic structures (ferrite and stabilized austenite) or bainitic ferrite during austempering [12,15]. Thus, the domain of applicability of AGCI is even wider than that of GCI due to its favorable combination of enhanced mechanical properties [11,12,13,14,15] and improved wear characteristics [15,16,17]. The present literature, however, is lacking in reporting the corrosion behavior of AGCI, although a lot of work can be found on testing the corrosion behavior of ADI [7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Characteristics of Copper-Added Austempered Gray Cast Iron (AGCI)

et al. 2019

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The aim of this investigation was to assess the corrosion behavior of gray cast iron (GCI) alloyed with copper. Alloyed GCI specimens were austempered isothermally at varying temperatures. After austenitizing at 927 °C, the samples were austempered at different temperatures ranging from 260 to 385 °C with an interval of 25 °C for 60 min. As a result, these samples developed an ausferrite matrix with different percentages of austenite. The resulting microstructures were evaluated and characterized by optical microscope (OM), scanning electron microscope (SEM), and X-ray diffraction (XRD). The corrosion characteristics were determined using potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) of these samples. These tests were carried out in a medium of 0.5 M H2SO4 and 3.5% NaCl solution. It was observed from the potentiodynamic polarization results that with increasing austempering temperature, the corrosion rate decreased. All results of the EIS were in accordance with a constant phase element (CPE) model. It was found that with an increase in austempering temperature, the polarization resistance (Rp) increased. The austenite content was also found to influence the corrosion behavior of the austempered gray cast iron (AGCI).

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“…Austempering develops an ausferrite (ferrite and high carbon and stable austenite) microstructure. This unique microstructure (ausferrite) contributes standard mechanical properties to austempered gray cast iron (AGI) [4][5][6][7]. Therefore, AGI finds applications in the automobile industry as gears, pistons, cylinder liners, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Although, several research investigations on mechanical properties [4][5][6][7][8] and wear behavior [10][11][12][13][14] of austempered gray cast iron (AGI) have been carried out in the past, structured information on the effects of different austempering process parameters like alloy design, austenitizing temperature, austempering temperature and time of AGI is still lacking. Moreover, in the Indian context, cupola melting is the predominant mode of melting gray cast irons of wide section size ranges.…”

Section: Introductionmentioning

confidence: 99%

Investigation on mechanical properties and wear behavior of Cu-alloyed austempered gray cast iron (AGI)

Sarkar

Sutradhar

2018

Sādhanā

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The aim of this investigation is to assess the influence of austempering heat treatment on microstructure, mechanical properties, and wear behavior of copper alloyed AGI. Tensile and wear test samples are prepared from as-cast gray iron. Initially, samples are austenitized and then isothermally austempered at six different temperatures for the constant time period. The resulting microstructures are evaluated and characterized by means of a light microscope, scanning electron microscope (SEM) and X-ray diffraction analysis. The wear test is carried out using a ''block-on-roller'' type multi-tribotester machine. The mechanical properties and wear behavior of the AGI samples are also determined and discussed systematically. Results showed that the mechanical and wear properties of AGI are significantly enhanced in comparison with as-cast gray iron. The wear behavior of AGI samples may be correlated with microstructure and mechanical properties. The hardness, tensile strength, elongation and volume fraction of austenite act as independently in influencing the wear behavior.

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Production of Austempered Gray Iron (AGI) Using Forced Air Cooling

Cited by 11 publications

References 17 publications

Investigation of the Nodularisation Propensity of Calcined Cashew-Nut Shell-Ash in Cast-Iron Melt Graphite

Investigation of the Nodularisation Propensity of Calcined Cashew-Nut Shell-Ash in Cast-Iron Melt Graphite

Corrosion Characteristics of Copper-Added Austempered Gray Cast Iron (AGCI)

Investigation on mechanical properties and wear behavior of Cu-alloyed austempered gray cast iron (AGI)

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