Microstructural, mechanical and tribological characterization of aluminum-alloyed ductile cast irons based on aluminum content

Sandikoglu, Acelya; Gecü, Rıdvan

doi:10.1016/j.jallcom.2021.160428

Cited by 13 publications

(5 citation statements)

References 39 publications

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“…In addition, they reported that the A 1 temperature of the alloy with the 4 wt.% Al addition reached 960 • C, indicating that this alloy can be used at a higher temperature, compared to the commercial SiMo cast iron; and with the increase in Al content, the thermal expansivity of ferrite increased, the graphite content decreased, and the graphite nodularity changed from spheroidal to vermicular. These results are similar to those obtained by Adebayo [38] and Sandikoglu [14] in DI alloyed with Al.…”

Section: Introductionsupporting

confidence: 91%

“…A new DI classification called High-Silicon Ductile Iron (HSDI) has recently been introduced for DI with Si content ranging from 3.2 to 4.3 wt.%. It has been reported that with increasing Si content, hardness, tensile strength, and yield strength properties are promoted, while elongation to failure decreases [8,[12][13][14] and machinability and corrosion resistance improve [15][16][17][18]. These results suggest a potential advantage in the production process and performance over DI with lower Si content [10,11].…”

Section: Introductionmentioning

confidence: 98%

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Determination of Corrosion Resistance of High-Silicon Ductile Iron Alloyed with Nb

Valdez

Navarro

Valdés

et al. 2023

Metals

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In this study, the effects of Nb on the microstructural characteristics, hardness, and corrosion resistance of high-silicon ductile cast iron (HSDI)-3.6 wt.% Si were investigated. Samples from different castings with 0–0.9 wt.% Nb were obtained and compared to a commercial ductile iron. Microstructures showed that the amount of ferrite in the matrix increased with increasing Nb content, from 34% for unalloyed HSDI to 88% for HSDI-0.9 wt.% Nb. The presence of randomly distributed NbC carbides was identified by EDX for all the samples alloyed with Nb, and the hardness of the HSDI increased with the Nb content. To evaluate the influence of the Nb content on the corrosion resistance of HSDI, potentiodynamic tests were carried out in a solution of H2SO4. The highest corrosion rate on HSDI was obtained for the HSDI-0.3 wt.% Nb sample, with 2802 mills per year, due to the amount of pearlite present and the lowest presence of NbC carbides, compared to the HSDI-0.9 wt.% Nb, with 986 mills per year. This behavior was attributed to the ferrite matrix obtained because of a high Si content in the DI, which delayed the anodic dissolution of the alloy and suppressed the pearlitizing effect of Nb for contents greater than 0.3 wt.%, as well as to the effect of NbC carbides, which acted as inhibitors.

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Section: Introductionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 98%

Determination of Corrosion Resistance of High-Silicon Ductile Iron Alloyed with Nb

Valdez

Navarro

Valdés

et al. 2023

Metals

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“…Recently, the tribological properties of Al-alloyed ductile cast irons were studied, the best wear properties was achieved by the 4 wt. % Al-alloyed nodular cast iron [25]. In the same work, the hardness of the EN-GJS-400-15 grade was augmented in function of increasing the amount of Al, obtaining the highest hardness value in the alloy containing 4 wt.…”

Section: Introductionmentioning

confidence: 92%

“…A comparison of the hardness and calculated density at room temperature of the developed cast irons with related works in the field [18,20,21,25] is given in Figure 6. As can be seen, the 0-Al cast iron showed a density of 7.22 g/cm 3 and a hardness value of 235 ± 14 HV 10, which is in accordance with the typical range between 186-247 HV of the EN-GJL-HB195 grade cast iron.…”

Section: Hardness Of the Samplesmentioning

confidence: 99%

Microstructural Evolution as a Function of Increasing Aluminum Content in Novel Lightweight Cast Irons

Obregon

Sánchez

Eguizabal

et al. 2021

Metals

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In the context of the development of new lightweight materials, Al-alloyed cast irons have a great potential for reducing the weight of the different part of the vehicles in the transport industry. The correlation of the amount of Al and its effect in the microstructure of cast irons is not completely well established as it is affected by many factors such as chemical composition, cooling rate, etc. In this work, four novel lightweight cast irons were developed with different amounts of Al (from 0 wt. % to 15 wt. %). The alloys were manufactured by an easily scalable and affordable gravity casting process in an induction furnace, and casted in a resin-bonded sand mold. The microstructural evolution as a function of increasing Al content by different microstructural characterization techniques was studied. The hardness of the cast irons was measured by the Vickers indentation test and correlated with the previously characterized microstructures. In general, the microstructural evolution shows that the perlite content decrease with the increment of wt. % of Al. The opposite occurs with the ferrite content. In the case of graphite, a slight increment occurs with 2 wt. % of Al, but a great decrease occurs until 15 wt. % of Al. The addition of Al promotes the stabilization of ferrite in the studied alloys. The hardness obtained varied from 235 HV and 363 HV in function of the Al content. The addition of Al increases the hardness of the studied cast irons, but not gradually. The alloy with the highest hardness is the alloy containing 7 wt. % Al, which is correlated with the formation of kappa-carbides and finer perlite.

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“…According to Seidu and Ripos an (2011), higher undercooling before recalescence increases the risk of formation of carbides during the solidification and reduces the nodule count. According to Sandikoglu and Gecu (2021), increase in aluminium concentration up to 4% will increase pearlite formation along with enhanced nodularity. Gecu (2022) observed alteration in graphite nodularity and reduction in the acicular ferrite ratio because of the addition of aluminum.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the effect of inoculant addition on the solidification of ductile cast irons using thermal analysis

Sangame¹,

Reddy

Shinde

2022

WJE

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Purpose The final properties of ductile iron are decided by the inoculant processing while pouring the melt. The shape and size of nodules generated during solidification are of paramount importance in solidification of ductile cast iron. The purpose of this study is to examine the effect of different inoculant addition on the solidification of ductile cast iron melt through thermal analysis. Design/methodology/approach Thermal analysis has recently grown as a tool for modeling the solidification behavior of ductile cast irons. Iron properties will be predicted by analyzing the cooling curve patterns of the melts and predicting the related effectiveness of inoculant processing. In this study, thermal analysis is used to evaluate the need for inoculation. Findings The amount and type of inoculation will affect the amount of undercooling during the solidification of ductile cast iron. It is found that the addition of 0.1 to 0.4 Wt.% inoculant lowers the austenite dendrite formation starting temperature while increasing the eutectic freezing temperature. Microstructure analysis revealed that the addition of inoculation increases the nodule count from 103 to 242 nodules. The beneficial effects of inoculation are sustained by an improved graphitization factor, which shows the formation of graphite nodules in the second phase of the eutectic reaction. Originality/value The inoculation treatment has improved metallurgical occurrences such as carbide to graphite conversion, graphite microstructure control, graphite nodule count at the start of solidification and the last stage of solidification, which determines the soundness of casting. The foundry industry can follow these steps for monitoring the solidification of ductile iron castings.

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Microstructural, mechanical and tribological characterization of aluminum-alloyed ductile cast irons based on aluminum content

Cited by 13 publications

References 39 publications

Determination of Corrosion Resistance of High-Silicon Ductile Iron Alloyed with Nb

Determination of Corrosion Resistance of High-Silicon Ductile Iron Alloyed with Nb

Microstructural Evolution as a Function of Increasing Aluminum Content in Novel Lightweight Cast Irons

Analyzing the effect of inoculant addition on the solidification of ductile cast irons using thermal analysis

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