Graphite growth control analysis in high Al cast iron

Muhmond, Haji Muhammad; Fredriksson, Hasse

doi:10.1080/13640461.2016.1174454

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…Degenerations can possibly be explained by an influence of aluminum on the orientation of the graphite surface. In contrast to the literature, a decreased nodule count was measured for aluminum-alloyed material A2 [18][19][20]. Graphite nodules were also unevenly distributed, causing the formation of graphite clusters which acted as crack-initiating defects and finally reduced fatigue strength.…”

Section: Discussioncontrasting

confidence: 65%

“…They reduce the solubility of carbon in the melt, which can be expressed by a higher particle number with a simultaneously smaller sphere size, since the possibility of graphite formation increases [18]. This higher formation rate promotes the formation of chunky graphite [19] and decreases nodularity [20]. If these influences and their interactions are thoroughly understood, there could be a potential to specifically adjust the fatigue strength of this alloy group by adding small amounts of aluminum.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Aluminum on Fatigue Strength of Solution-Strengthened Nodular Cast Iron

Gebhardt

Nellessen

Bührig–Polaczek

et al. 2021

Metals

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The fatigue strength of high silicon-alloyed nodular cast iron is influenced by casting defects and graphite precipitates. The literature as well as the findings of this work show that these microstructural constituents can be tailored by controlling silicon microsegregation. In addition, segregations also affect the ferritic matrix microstructure locally. In the present work, silicon segregations in high silicon-alloyed ductile iron are specifically manipulated by small additions of aluminum. It was demonstrated how the aluminum content affects a wide range of microstructural constituents across a variety of length scales. Specimens from alloys with small additions of aluminum were fabricated and tested by rotating bending. Results show that the fatigue strength can be increased compared to a reference alloy with no aluminum. Microstructure analysis as well as fractography were performed concluding that microstructural changes could be attributed to the increased aluminum content, which allows the fatigue properties to be tailored deliberately. However, according to the results of this study, the negative effect of aluminum on castability and graphite morphology limits the maximum content to approximately 0.2 wt.%.

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Section: Discussioncontrasting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Influence of Aluminum on Fatigue Strength of Solution-Strengthened Nodular Cast Iron

Gebhardt

Nellessen

Bührig–Polaczek

et al. 2021

Metals

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“…A transition within the investigated range of cooling rates would thus give some insight in graphite growth mechanisms. Aluminium -which is reported as a vermicular graphite promoter [1][2][3][4][5] -was selected because it affects graphite shape above a critical level which is within the capabilities of modern means for microanalysis.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Rate and Aluminium Addition on Graphite Growth during Solidification and Graphitization

Bourdie

Bruneseaux

Parseval

et al. 2018

MSF

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Abstract. Even using high inoculation levels, mottled structures are often obtained when casting Mg-treated cast irons in thin wall parts. For full graphitization of the cast components, this calls for a subsequent heat-treatment which is generally achieved in the austenite field. The aim of this work was investigating the impact of the process and the cooling rate on the graphite structure for two different casting conditions. The influence of the cooling rate on graphite degeneracy due to the presence of impurity was also investigated considering low-level additions of aluminium. Extensive metallographic investigation has been carried out from which it is concluded that the internal graphite structure is the same for the two studied cooling conditions. Accordingly, the growth mechanism of graphite should be the same when it precipitates from liquid, during eutectic reaction or else solid-state graphitization. Finally, microanalyses suggest magnesium and aluminium do not interact in the same way with graphite during its growth.

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High-Temperature Oxidation Behavior of Spheroidal Graphite Cast Irons Containing up to 7.5 wt% Aluminum at 750 °C in Static Air

Khalvan

Divandari

2022

Oxid Met

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Graphite growth control analysis in high Al cast iron

Cited by 6 publications

References 7 publications

Influence of Aluminum on Fatigue Strength of Solution-Strengthened Nodular Cast Iron

Influence of Aluminum on Fatigue Strength of Solution-Strengthened Nodular Cast Iron

Effect of Cooling Rate and Aluminium Addition on Graphite Growth during Solidification and Graphitization

High-Temperature Oxidation Behavior of Spheroidal Graphite Cast Irons Containing up to 7.5 wt% Aluminum at 750 °C in Static Air

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