Chemical composition and structural identification of eutectic carbide in 1 pct Mn ductile iron

Nili‐Ahmadabadi, Mahmoud; Niyama, Eisuke; Tanino, Mitsuru; Abe, Toshihiko; Ohide, Taku

doi:10.1007/bf02652266

Cited by 11 publications

(7 citation statements)

References 3 publications

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“…Of the carbide possibilities, cementite, -carbide, and -carbide [13] show the best agreement with the measured values. Of the carbide possibilities, cementite, -carbide, and -carbide [13] show the best agreement with the measured values.…”

Section: A Segregationsupporting

confidence: 52%

A transmission electron microscope study of 1 Pct Mn ductile iron with different austempering treatments

Nili‐Ahmadabadi

1998

Metall Mater Trans A

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A transmission electron microscope (TEM) equipped with an energy dispersive spectroscopy (EDS) system was used to study the bainitic reaction in a conventional and a successive austempering process for 1 wt pct Mn ductile iron. In the case of conventional austempering, the specimens were full austenitized at 900 ЊC and then austempered at 375 ЊC (high austempering temperature) and 315 ЊC (low austempering temperature) for different periods. In the case of the successive austempering process, following austempering at 375 ЊC for different periods, specimens were austempered at 315 ЊC, and subsequently quenched in ice water. The TEM-EDS study showed that carbide precipitation in the ferritic and retained austenitic component of bainite is a function of the local concentrations of the alloying elements, austempering time, and temperature. After a short time at high austempering temperature, carbide-free bainite forms near graphite nodules. Longer austempering time or lower austempering temperature encourages carbide precipitation in the bainitic ferrite. A long austempering time at high temperature leads to decomposition of retained austenite to ferrite and carbide. A rough inspection shows that the precipitated carbides in the ferritic component of specimens austempered at low temperature lie at an angle of about 40 to 50 deg to the sheaf axis.

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Section: A Segregationsupporting

confidence: 52%

A transmission electron microscope study of 1 Pct Mn ductile iron with different austempering treatments

Nili‐Ahmadabadi

1998

Metall Mater Trans A

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“…The tendency of manganese to promote the formation of intercellular carbides was studied by Ahmadabadi et al in DI possessing 1 wt% manganese. 9 An overview of the individual impact of different alloying elements in DI is given by Hasse. 10 Extensive experimental investigations are necessary to analyze the cumulative impact of carbidepromoting elements on the microstructure of DI.…”

Section: Impact Of Carbide-promoting Elements In Ductile Ironmentioning

confidence: 99%

Influence of Carbide-Promoting Elements on the Microstructure of High-Silicon Ductile Iron

2020

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Because of its low cost, steel scrap is one of the most important raw materials for the production of ductile iron (DI). The amount of carbide-promoting elements in steel scrap, such as chromium, manganese, molybdenum, niobium and vanadium, is expected to increase in the future. Most of these elements have a negative impact on the microstructure and mechanical properties of DI. The solubility of carbide-promoting elements in solid solutionstrengthened DI materials, standardized in DIN EN 1563:2011, is modified by the high silicon content. For these new materials, the tolerance limits for carbide-promoting elements and their mutual influence must be known to ensure a sustainable production process. To investigate the individual and combined impact of carbide-promoting elements on the carbide content in high-silicon ductile iron EN-GJS-500-14, experimental investigations and thermodynamic-kinetic microstructure simulations were carried out. Microstructure was characterized using metallographic analysis, and quantitative relations between chemical composition and microstructure were developed by means of regression analysis. Besides this quantitative analysis, it was found that the formation of grain boundary carbides can be detected via thermal analysis. Furthermore, experiments and simulations showed that vanadium promotes the formation of chunky graphite in high-silicon DI castings.

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“…There are many factors influence the microstructure and mechanical properties of ductile iron castings, such as chemical composition, cooling rate, liquid treatment and heat treatment [10][11][12][13]. For identical conditions, cooling rate plays a significant role in determining the microstructure and hence mechanical properties of heavy section ductile iron [12].…”

Section: Fig 5 Predicted Area Of Porosity Riskmentioning

confidence: 99%

Simulation of Casting Process for Ductile Iron Wind Generator Rotor Shaft

You

Diao

2012

AMR

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Casting process of heavy section ductile iron wind generator rotor shaft was simulated by finite element software ProCAST. Gating systems was designed according to the structure of the casting. Solidification behavior of the casting was then analyzed. Defects, especially porosity, of the casting during solidification were predicted and hence casting process optimization has been performed based on the simulation results in order to avoid porosity in the casting. Results show that solidification time of the casting is more than 14h when cooled in sand mold. Porosity easily formed at the thermal center and in the middle of flange. Solidification time is evidently decreased with the help of chills. However, porosity tendency depends on the position of chills. A ductile iron rotor shaft casting with good quality was finally produced according to the simulation results.

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Chemical composition and structural identification of eutectic carbide in 1 pct Mn ductile iron

Cited by 11 publications

References 3 publications

A transmission electron microscope study of 1 Pct Mn ductile iron with different austempering treatments

A transmission electron microscope study of 1 Pct Mn ductile iron with different austempering treatments

Influence of Carbide-Promoting Elements on the Microstructure of High-Silicon Ductile Iron

Simulation of Casting Process for Ductile Iron Wind Generator Rotor Shaft

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