Influence of nickel addition and casting modulus on the properties of hypo-eutectic ductile cast iron

García, Eduardo Colin; Cruz-Ramírez, Alejandro; Reyes-Castellanos, G.; Romero‐Serrano, Antonio; Sánchez-Alvarado, R.G.; Hernández-Chávez, Macaria

doi:10.2298/jmmb181012023c

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…In spite of the high cooling rates imposed in the sample DI-A (8.46 mm), there was no evidence of carbides formation as cementite. The tendency to form the carbides was decreased by the addition of nickel [19]. Nickel is a good graphitiser and when added to the Fe-C system, there is a reduction of the carbon content in the eutectic, the interval between austenite-graphite and austenite-cementite eutectic transformation is increased, and the formation of carbides is suppressed [31].…”

Section: Microstructure In the As-cast Condition 31mentioning

confidence: 99%

“…Copper, molybdenum, and nickel [8] improve the austemperability of ADI to avoid the pearlite formation during quenching while other elements such as V, Cr, B, and Mo (in excess) are avoided due to their ability to form carbides [15][16][17][18]. The effect of the casting thickness, reported as the casting modulus on the mechanical properties, was reported for a ductile iron alloyed with 0.88 wt % nickel in the ascast condition [19]. It is well known that nodule count increases noticeably as the solidification rate increases.…”

Section: Introductionmentioning

confidence: 99%

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Nodule count effect on microstructure and mechanical properties of hypo-eutectic ADI alloyed with nickel

García

Cruz-Ramírez

Romero-Serrano

et al. 2021

J min metall B Metall

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Samples of ductile iron alloyed with 0.88 % Ni with a nodule count of 606, 523, and 290 nod/mm2 were obtained from sand cast plates of different thickness in the range from 8.46 to 25.4 mm. The effect of the nodule count was evaluated during the austempering process held at 285?C and austempering times of 15, 30, 45, 60, 70, and 90 min. The volume fraction of high carbon austenite was increased when the nodule count was increased, however, the carbon content of the high carbon austenite kept almost constant. The process window was narrow, requiring a lower austempering time when the nodule count was increased. The combination of a higher nodule count and low austempering temperature allows obtaining a fine ausferritic microstructure which leads higher Brinell hardness and tensile strength. The process window was determined by XRD measurements and it is in good agreement with the microstructural and hardness evolution as the austempering time was increased.

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Section: Microstructure In the As-cast Condition 31mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nodule count effect on microstructure and mechanical properties of hypo-eutectic ADI alloyed with nickel

García

Cruz-Ramírez

Romero-Serrano

et al. 2021

J min metall B Metall

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“…Selain itu material besi cor dapat ditingkatkan sifat mekaniknya dengan cara ditambahkan unsur paduan, diantaranya nikel [9][10][11] . Nikel ditambahkan untuk meningkatkan kekuatan tarik dan kekerasan dengan metode solid solution strenghtening [12] . Selama solidifikasi tersebut nikel berperan memisahkan sel eutektik dengan nodular grafit, hal ini mengurangi laju pembentukan karbida sehingga membuat nodular grafit lebih tipis.…”

Section: Pendahuluanunclassified

Pengaruh Temperatur Austempering Terhadap Sifat Mekanik Dan Struktur Mikro Besi Cor Kelabu Dengan Nikel 10% Untuk Komponen Boiler Pltu

Widyansyah,

Mabruri,

Alfirano

2023

JRM

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Effect of austempering temperature on microstructure and mechanical properties gray cast iron with 10%wt nickel for boiler combustion application has been studied. Cast iron with the JIS FCD 45 standard with a minimum tensile strength of 414 MPa and a hardness of 187 HB is commonly used for this application. To improve its mechanical properties such as strength and hardness, austempering heat treatment usually applied. Austempering was carried out at 250°C, 300°C, 350°C, 400°C, and 450°C for 1 hour, with the same austenization temperature of 850°C for 1 hour. The highest increase in hardness was found at the austempering temperature of 250°C. The hardness was 321.80 HB or 19.30% of the initial hardness of 259.70 HB. In terms of strength, the highest increase occurred at the austempering temperature of 250°C which was 257 MPa or 31.52% of the initial strength of 176 MPa.

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“…Austempered ductile irons (ADIs) are advanced spheroidal irons produced through heat-treating conventional ductile irons (DIs), resulting in a dual phase acicular microstructure called ausferrite, consisting of hard bainitic ferrite α and metastable high C content austenite γ HC [1][2][3][4][5][6][7][8]. Ausferrite has an excellent combination of strength, ductility [9][10][11][12][13] and other mechanical properties, such as fatigue and fracture resistance [14][15][16][17][18][19][20][21][22][23]. Their properties are similar to cast and wrought steels, with which they can compete as materials for applications in components for heavy transportation, such as trucks, earth-moving machinery and the train industry [24][25][26][27], thanks also to their production cost that is about 50% less than the cost of steels and their density that is about 10-12% lower [7,28,29].…”

Section: Introductionmentioning

confidence: 99%

On Ausferrite Produced in Thin Sections: Stability Assessment through Round and Flat Tensile Specimen Testing

Angella

Donnini

Ripamonti

et al. 2023

Metals

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Ductile irons were produced into different casting wall sections, that is, 25 mm, 5 mm and 3 mm. The alloys were then austenitized with the same conditions at 875 °C for 2 h and austempered for three different combinations of temperatures and times: 250 °C for 6 h, 310 °C for 3 h and 380 °C for 1 h. The aim of the investigation was to study the ausferrite stability of austempered ductile irons with three different nominal contents of nickel produced in thin sections through tensile testing. So, strain hardening analysis of tensile flow curves was carried out since it has been found to be a reliable support to ductility analysis in assessing the optimal austempering conditions. Because of different wall sections, round and flat tensile specimens with geometries complying with ASTM E8/E8M-11 were tested. Austempered ductile irons from 5 and 3 mm wall sections were tested through flat geometry specimens only, while 25 mm wall sections were tested through both round and flat geometries. Though the ausferrite was affected by Ni content and the graphite morphology was improved with reduced thin sections, the ausferrite stability and the tensile mechanical behavior were insensitive to Ni content and section thickness below 25 mm. Furthermore, it resulted that the tensile plastic behavior was sensitive to the specimen geometry in a consistent way, increasing the instability of ausferrite and indicating that a proper analysis and comparison of tensile properties of austempered ductile irons must take into account the tensile specimen geometry.

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Influence of nickel addition and casting modulus on the properties of hypo-eutectic ductile cast iron

Abstract: Influence of nIckel addItIon and caStIng ModuluS on the propertIeS of hypo-eutectIc ductIle caSt Iron e. colin-garcía a , a. cruz-ramírez a* , g. reyes-castellanos a , J.a. romero-Serrano a , r.g. Sánchez-alvarado a , M. hernández-chávez b a

Cited by 8 publications

References 15 publications

Nodule count effect on microstructure and mechanical properties of hypo-eutectic ADI alloyed with nickel

Nodule count effect on microstructure and mechanical properties of hypo-eutectic ADI alloyed with nickel

Pengaruh Temperatur Austempering Terhadap Sifat Mekanik Dan Struktur Mikro Besi Cor Kelabu Dengan Nikel 10% Untuk Komponen Boiler Pltu

On Ausferrite Produced in Thin Sections: Stability Assessment through Round and Flat Tensile Specimen Testing

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