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Refaey, Abdullah A.; Fatahalla, N.

doi:10.1023/a:1021177902596

Cited by 45 publications

(21 citation statements)

References 14 publications

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“…Again we can observe vacant sites "V" referring to pulled nodules and some fragmentation of graphite. The relatively large clearance between nodule and its cavity indicates the degree of plasticity prior to fracture, this result confirms that obtained previously by Fatahalla et al [40]. Figure 12 shows the fracture surfaces of ADI (alloys 2, 3) after failure in impact testing.…”

Section: Fracture Surface Observationssupporting

confidence: 87%

Microstructure, Mechanical Properties, Toughness, Wear Characteristics and Fracture Phenomena of Austenitised and Austempered Low-Alloyed Ductile Iron

Fatahalla¹,

Hussein²

2015

OALib

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Conventional ductile iron (DI) and austempered ductile iron (ADI) alloys were successfully produced. The alloying elements-Ni, Mo, Cr and Mn were added to get as-cast low-alloyed ductile iron (LADI) followed by austempering heat treatment. Hardness was measured for all investigated alloys. A hardness conversion table was deduced for irons investigated. Highest values of calculated quality index (QI) were for ADI alloys implying higher material performance. Impact energy values were attributed to microstructure and tensile properties. Wear characteristics of selected ADI alloys showed comparable values with LADI. Micro-hardness values were used to identify the micro-constituents and the work-hardened layers. Fracture modes were revealed and fracture surface observations were done by SEM. Due to higher toughness and QI, and cheap price, it is suggested that rolling mills may be produced from ADI, specially heat-treated instead of LADI.

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Section: Fracture Surface Observationssupporting

confidence: 87%

Microstructure, Mechanical Properties, Toughness, Wear Characteristics and Fracture Phenomena of Austenitised and Austempered Low-Alloyed Ductile Iron

Fatahalla¹,

Hussein²

2015

OALib

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“…The area percentage of carbides at different austenitizing temperatures was measured by the Image-pro software, and ln(1 À S/S 0 ) was calculated. According to Equation (12), there was a linear relationship between ln(1 À S/S 0 ) and 1/T, and the slope of the fit line was ÀQ/R, but the values of C, C 0 , C s , A 0 , D 0 , Q, and D were unknown. Therefore, this study obtained a slope of the fit line by linear fitting, which is À18267.3365.…”

Section: Effect Of Austenitizing Temperature On Carbide Dissolutionmentioning

confidence: 99%

“…At present, the influences of austenitizing temperature and holding time on the microstructure and properties of CADI have been studied . However, these studies lacked the quantitative analysis about the austenitizing process of ductile iron.…”

Section: Introductionmentioning

confidence: 99%

“…At present, the influences of austenitizing temperature and holding time on the microstructure and properties of CADI have been studied. [2][3][4][5][6][7][8][9][10][11][12] However, these studies lacked the quantitative analysis about the austenitizing process of ductile iron. Due to the limits of the experimental equipment and the computer technology, the austenitizing process of ductile iron could not be revealed accurately from the kinetics and thermodynamic aspects using the previous methods.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic and Kinetic Analysis of Austenite Homogenization on Carbidic Ductile Iron

Yang

Lin

et al. 2019

steel research int.

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The austenite homogenization of carbidic austempered ductile iron is studied from both thermodynamics and dynamics by calculation and experimentation, and a mathematical model of carbide dissolution is established to predict the dissolved quantity of carbides. The results indicate that the mass fraction of carbon in austenite (austenite–graphite stable equilibrium) calculated by the Thermo‐Calc software is similar to the results quantitatively analyzed by electron probe. Based on Fick's second law, the elemental diffusion kinetics is analyzed by MATLAB software. Because the diffusion rate of chromium in austenite is lower than carbon, the carbon content is significantly decreased around undissolved carbides, but the chromium content is still high. Two equations of undissolved carbides' area are obtained by linear fitting.

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“…Announcements were made in a very short period from Finland [4] that was followed by China [5] and USA [6], respectively that ductile iron castings could be austempered. The announcements of commercial production resulted in a worldwide explosion in research in terms of its strength and ductility [6][7][8], hardness [6][7][8][9], wear resistance [6][7][8][9][10], impact energy [6][7][8][9][10][11], fracture toughness [12,13], machinability [6,14,15], transformation kinetics [6,15,16], and electrical and thermal behaviors [13], which provided a solid background for expanding the production of this material in many industrialized countries since the 90's [17].…”

Section: Introductionmentioning

confidence: 99%

Influence of Cu and Ni Alloying on the Microstructure and Mechanical Properties of Austempered Ductile Iron Castings

2019

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Austempered ductile cast iron (ADI) offers a good combination of high tensile and fatigue strength, good ductility, toughness, wear resistance and damping characteristics, lower density in an economical way. This excellent combination of properties is due to the specific microstructure of ADI; which is composed of spheroidal graphite particles on an ausferritic matrix. The ausferrite consists of acicular ferrite and high carbon retained austenite; which is produced via austempering heat treatment after casting. The alloying additions of Cu or Cu + Ni increases austemperability, which means completely ausferritic structures can be produced on larger cross-sections. In the present study the effect of the alloying additions of Cu and Cu + Ni on mechanical properties and microstructure of ADI was studied. For that purpose, Y-block specimens having a lean composition, 0.8% Cu and 0.8% Cu + 0.4% Ni alloying additions were cast. After austempering treatment, mechanical tests, fractographic and metallographic examinations were performed. The results show that the Cu + Ni alloyed specimen has higher strength and elongation. The lean alloy on the other hand, has the highest nodularity and matrix hardness but the lowest strength and ductility. Those differences in mechanical properties were attributed to the fraction and morphology of the retained austenite regions of the matrix.

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Cited by 45 publications

References 14 publications

Microstructure, Mechanical Properties, Toughness, Wear Characteristics and Fracture Phenomena of Austenitised and Austempered Low-Alloyed Ductile Iron

Microstructure, Mechanical Properties, Toughness, Wear Characteristics and Fracture Phenomena of Austenitised and Austempered Low-Alloyed Ductile Iron

Thermodynamic and Kinetic Analysis of Austenite Homogenization on Carbidic Ductile Iron

Influence of Cu and Ni Alloying on the Microstructure and Mechanical Properties of Austempered Ductile Iron Castings

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