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New experimental technique for nodularity and Mg fading control in compacted graphite iron production on laboratory scale
Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.ORCID iD: 0000-0002-6339-4292
Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.ORCID iD: 0000-0001-6938-037X
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2017 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 48, no 11, 5432-5441 p.Article in journal (Refereed) Published
Abstract [en]

The narrow production window for compacted graphite iron material (CGI) drastically reduces the possibilities to produce it in small batches outside an industrial environment. This fact hinders laboratory-scale investigations on CGI solidification. This work presents a solution to that issue by introducing an experimental technique to produce graphitic cast iron of the main three families. Samples of a base hypereutectic spheroidal graphite iron (SGI) were re-melted in a resistance furnace under Ar atmosphere. Varying the holding time at 1723 K (1450 °C), graphitic irons ranging from spheroidal to lamellar were produced. Characterization of the graphite morphology evolution, in terms of nodularity as a function of holding time, is presented. The nodularity decay for the SGI region suggests a linear correlation with the holding time. In the CGI region, nodularity deterioration shows a slower rate, concluding with the sudden appearance of lamellar graphite. The fading process of magnesium, showing agreement with previous researchers, is described by means of empirical relations as a function of holding time and nodularity. The results on nodularity fade and number of nodules per unit area fade suggest that both phenomena occur simultaneously during the fading process of magnesium.

Place, publisher, year, edition, pages
Springer, 2017. Vol. 48, no 11, 5432-5441 p.
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-35584DOI: 10.1007/s11661-017-4315-3Scopus ID: 2-s2.0-85029483568OAI: oai:DiVA.org:hj-35584DiVA: diva2:1097232
Note

Included in licentiate thesis in submitted manuscript version with title "New experimental technique for nodularity and Mg fading control in CGI production on laboratory scale".

Available from: 2017-09-15 Created: 2017-05-22 Last updated: 2017-10-24Bibliographically approved
In thesis
1. Morphological characterization of primary austenite in cast iron
Open this publication in new window or tab >>Morphological characterization of primary austenite in cast iron
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Automotive industry products portfolio includes a wide variety of complex‐shaped cast iron products, such as truck engine components, that need to withstand a constant trend of higher demands, especially urged by stricter environmental regulations on emissions. Combined with this continued demand on properties improvement, cast iron industry faces a process problem related to the lack of understanding of solidification and mechanisms behind defect formation.

Casting products are highly affected by the product design and the manufacturing method itself, which governs the final microstructure and hence the final mechanical properties. Wall thickness of the moulding material strongly influences the solidification time, varying the microstructural coarseness, resulting in a component with different properties depending on the local shape of the casting.

The main objective of this work is the characterization of the primary austenite microstructure and its coarsening process, which has been poorly documented in cast iron literature, to allow the prediction and control of these microstructural features present in the casting.

The microstructural evolution of the primary austenite in hypoeutectic lamellar graphite iron (LGI) is studied under isothermal coarsening conditions. The dendritic microstructure suffered major morphological changes that included dendrite fragmentation, globularization, and coalescence. Empirical relations based on morphological parameters are introduced to predict the microstructural evolution of primary austenite. A novel technique for colour‐etching and semi‐automatic image analysis for the characterization of quenched dendritic microstructures in cast iron is presented. A new experimental technique for production of graphitic iron with varying nodularity is presented as a solution to control the production of compacted (CGI) and spheroidal graphite iron (SGI) under laboratory conditions. The nodularity evolution is controlled as a function of the holding time and the residual Mg, allowing the study of the primary solidification and primary microstructures of hypoeutectic CGI and SGI in future investigations.

Place, publisher, year, edition, pages
Jönköping: Jönköping University, School of Engineering, 2017. 50 p.
Series
JTH Dissertation Series, 23
Keyword
Lamellar Graphite Iron, Solidification, Primary Austenite, Microstructure Evolution, Dendritic coarsening, Compacted Graphite Iron, Magnesium Fading, Nodularity
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-35585 (URN)9789187289248 (ISBN)
Supervisors
Available from: 2017-05-22 Created: 2017-05-22 Last updated: 2017-08-16Bibliographically approved

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