Abstract
An apparatus was developed to cast simulated ingot butts under conditions representative of solidification in commercial-scale DC ingots. The development of the as-cast microstructures of two distinct Al–Zn–Mg–Cu alloys were compared in an effort to determine the reasons for disparate hot-cracking behavior. Metallographic analysis was performed which generated an extensive collection of BSE and EDX map images which were processed using an automated image analysis technique. It was found that solidification rate, zinc and magnesium concentration, as well as silicon and iron concentrations affect the quantity, scale, and constitution of the eutectic structures and porosity. The disparate cracking behavior between the alloys examined was described and explained by the difference in each alloy’s ability to accommodate the strain resulting from solidification.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
L. Backerud, E. Krol and J. Tamminen, Solidification Characteristics of Aluminum Alloys, Vol 1–3, vol. 1, Oslo, Norway: Skanaluminium, 1986.
D. G. Eskin, Physical Metallurgy of Direct Chill Casting of Aluminum Alloys, Boca Raton: CRC Press, 2008.
J. F. Grandfield, D. G. Eskin and I. F. Bainbridge, Direct-Chill Casting of Light Alloys, Hoboken: John Wiley and Sons, 2013.
L. F. Mondolfo, Aluminum Alloys: Structure and Properties, London: Butterworths, 1976.
D. G. Eskin, R. Nadella and L. Katgerman, “Effect of Different Grain Structures on Centerline Macrosegregation During Direct Chill Casting,” Acta Materialia, vol. 56, pp. 1358–1365, 2008.
M. G. Chu and J. E. Jacoby, “Macrosegregation Characteristics of Commercial Size Aluminum Alloy Ingot Cast by the Direct Chill Method,” in Light Metals 1990, Anaheim, 1990.
M. Rappaz, J. M. Drezet and M. Gremaud, “A New Hot-Tearing Criterion,” Metallurgical and Materials Transactions A, vol. 30A, pp. 449–455, 1999.
J. A. Danzig and M. Rappaz, Solidification, Boca Raton: CRC Press, 2009.
E. E. Underwood, Quantitative Stereology, Reading, MA: Addison-Wesley, 1970.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 The Minerals, Metals & Materials Society
About this paper
Cite this paper
Gildemeister, D. (2018). Effects of Microstructure on Hot Cracking Behavior in Al–Zn–Mg–Cu Alloys. In: Martin, O. (eds) Light Metals 2018. TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-72284-9_143
Download citation
DOI: https://doi.org/10.1007/978-3-319-72284-9_143
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-72283-2
Online ISBN: 978-3-319-72284-9
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)