Abstract
Good quality casting that meets the customer's requirements depends on many factors. Generally, these can be classified into two groups, related to metal and the casting mold. However, it may happen that the metal meets all the criteria and the mold is properly made but the quality of the casting can be unsatisfactory. The reason for this may be the phenomena on the interface mold/casting, which are not always taken into account. Processes taking place there are mainly due to the quality of the casting surface, which is very important; especially in the case of castings whose surface is exposed directly to adverse factors (wet corrosion, dry corrosion, wear, etc.). However, processes taking place on the interface mold/casting may also adversely affect the mechanical properties of the casting, e.g., tensile strength, fatigue limits, machinability. This is caused by the degeneration of nodular and compacted/vermicular graphite, or decarburization of the casting surface layer, or the appearance of areas of pearlitic/ferritic rim. Several mechanisms are responsible for the formation of abnormal surface layer on the CGI and SGI castings, which are associated with a reduction in the concentration of either Mg (reaction with S and/or O) or the cooling rate of the casting (formation of austenite layer).
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References
Svoboda JM (1994) Mechanisms of metal penetration in foundry molds. AFS Trans. 102:461–473
Hayes KD et al (1998) Mechanical penetration of liquid steel in sand molds. AFS Trans 106:769–776
Lane AM et al (2001) Penetration of liquid steel in sand molds, part II: Chemical reactions at the mold/metal interface during casting of steel. AFS Transa. 109:1327–1345
Stefanescu DM el al (1996) Cast iron penetration in sand molds. Part I: Physics of penetration defects and penetration model. AFS Trans 104:1233–1248
Boonmee S, Stefanescu DM (2013) Casting skin management in compacted graphite iron. Part I: Effect of mold coating and section thickness. AFS Trans 121:435–448
Boonmee S (2013) Ductile and compacted graphite iron casting skin—evaluation, effect on fatigue strength and elimination. PhD Dissertation, The Ohio State University. https://etd.ohiolink.edu/!etd.send_file?accession=osu1364310320&disposition=inline
Stefanescu DM (2008) The effect of mould/metal interface phenomena on the surface quality of casting. 10th Asian Foundry Congress (AFC10), Nagoya, Japan, pp 21–24
Stefanescu DM, Wills S, Massone J, Duncan F (2008) Quantification of casting skin in ductile and compacted graphite irons and its effect on tensile properties. Int J Metalcast 2(4):7–26
Boonmee S, Stefanescu DM (2013) Casting skin management in compacted graphite iron. Part II: Mechanism of casting skin formation. AFS Trans 121:449–459
Boonmee S, Stefanescu DM (2014) The occurrence and the effect of casting skin in compacted graphite iron. In: Preceedings of 10th international symposium on the science and processing of cast iron—SPCI10, Mar del Plata, Argentina, paper No. 03
Boonmee S, Moran MK, Stefanescu DM (2011) On the effect of the casting skin on the fatigue properties of CG iron. AFS Trans 119:421–430
Górny M, Dańko R, Holtzer M (2015) The effects of the metal temperature and wall thickness on flake graphite layer in ductile iron. Metalurgija 54(1):11–14
Ruff GF, Doshi BK (1980) Relation between mechanical properties and graphite structure in cast irons, part I-gray iron. Modern Casting, pp 50–55
Javaid A, Thompson J, Davis KG, Sahoo M (2001) Effect of microstructure on the mechanical properties thin-wall ductile iron castings. AFS Trans 109:1097–1114
Goodrich GM, Lobenhofer RW (2002) Effect of cooling rate on pearlitic ductile iron mechanical properties. AFS Trans 110:1003–1032
Riposan I, Chisamera M, Stan S, Skaland T (2006) Factors influencing the surface graphite degeneration in ductile iron castings in resin mold technology. In: Proceedings of the 8th international symposium on science and processing of cast iron, Beijing, China
Dańko R, Holtzer M, Górny M, Żymankowska-Kumon S (2014) Effect of the quality of furan moulding sand on the skin layer of ductile iron castings. ISIJ Int 54(6):1288–1293
Dańko R, Holtzer M, Górny M, Żymankowska-Kumon S (2013) Effect of reclamation on the skin layer of ductile iron cast in furan molds. J Mat Eng Perform 22(11):3592–3600
Chrismera M. et al. (2014) Iron casting skin management in no-bake mould-effects of magnesium residual level and mould coating. In: 71th World Foundry Congress, Bilbao, pp 19–21
Holtzer M, Dańko R, Górny M (2014) Influence of the furfuryl moulding sand on the flake graphite formation in the surface layer of ductile iron castings. In: Preceedings of 10th international symposium on the science and processing of cast iron—SPCI10, Mar del Plata, Argentina, paper No. 41
Boonmee S, Stefanescu DM (2011) The mechanism of formation of casting skin in CG iron. Key Eng Mater 437:11–16
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Holtzer, M., Górny, M., Dańko, R. (2015). Phenomena Model on the Mold/Casting Interface. In: Microstructure and Properties of Ductile Iron and Compacted Graphite Iron Castings. SpringerBriefs in Materials. Springer, Cham. https://doi.org/10.1007/978-3-319-14583-9_9
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