Mold Coatings to Reduce Graphite Degeneration in the Surface Layer of Ductile Iron Castings

2012 ◽  
Vol 6 (4) ◽  
pp. 61-70 ◽  
Author(s):  
N. Ivan ◽  
M. Chisamera ◽  
I. Riposan
Keyword(s):  
Surface Layer ◽  
Ductile Iron ◽  
Iron Castings

scholarly journals New Possibilities of Shaping the Surface Properties in Austempered Ductile Iron Castings

2013 ◽  
Vol 13 (1) ◽  
pp. 103-106 ◽  
Author(s):  
D. Myszka
Keyword(s):  
Surface Layer ◽  
Surface Properties ◽  
Ductile Iron ◽  
Shot Peening ◽  
Austempered Ductile Iron ◽  
Protective Atmosphere ◽  
Detonation Spraying ◽  
Iron Castings ◽  
Recent Developments ◽  
Commercial Applications

Abstract The paper presents recent developments concerning the formation of surface layer in austempered ductile iron castings. It was found that the traditional methods used to change the properties of the surface layer, i.e. the effect of protective atmosphere during austenitising or shot peening, are not fully satisfactory to meet the demands of commercial applications. Therefore, new ways to shape the surface layer and the surface properties of austempered ductile iron castings are searched for, to mention only detonation spraying, carbonitriding, CVD methods, etc.

Mg bearing coating of resin sand–PTSA moulds to control graphite degeneration in surface layer of ductile iron castings

2012 ◽  
Vol 28 (11) ◽  
pp. 1246-1253 ◽  
Author(s):  
N Ivan ◽  
M Chisamera ◽  
I Riposan
Keyword(s):  
Surface Layer ◽  
Ductile Iron ◽  
Iron Castings

scholarly journals Shaping optimal zinc coating on the surface of high-quality ductile iron casting. Part I – Moulding technologies vs. zinc coating

2017 ◽  
Vol 62 (1) ◽  
pp. 385-390
Author(s):  
A. Szczęsny ◽  
D. Kopyciński ◽  
E. Guzik
Keyword(s):  
Surface Layer ◽  
Ductile Iron ◽  
Metal Matrix ◽  
Surface Condition ◽  
Zinc Coating ◽  
Casting Surface ◽  
Iron Castings ◽  
Coating Formation ◽  
Ductile Iron Casting

Abstract Studies have demonstrated that in the process of hot dip galvanizing the decisive influence on the mechanism of zinc coating formation and properties has the quality of the mechanically untreated (raw) surface layer of the galvanized product. The terms “casting surface layer” denote various parameters of the microstructure, including the type of metal matrix, the number of grains and the size of graphite nodules, possible presence of hard spots (the precipitates of eutectic cementite) and parameters of the surface condition. The completed research has allowed linking the manufacturing technology of ductile iron castings with the process of hot dip galvanizing.

Influence of furfuryl moulding sand on flake graphite formation in surface layer of ductile iron castings

2016 ◽  
Vol 29 (1-2) ◽  
pp. 17-25 ◽  
Author(s):  
M. Holtzer ◽  
R. Dańko ◽  
M. Gorny
Keyword(s):  
Surface Layer ◽  
Ductile Iron ◽  
Flake Graphite ◽  
Iron Castings ◽  
Moulding Sand

scholarly journals Experimental Study Regarding the Possibility of Blocking the Diffusion of Sulfur at Casting-Mold Interface in Ductile Iron Castings

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 673
Author(s):  
Denisa Anca ◽  
Iuliana Stan ◽  
Mihai Chisamera ◽  
Iulian Riposan ◽  
Stelian Stan
Keyword(s):  
Surface Layer ◽  
Ductile Iron ◽  
Steel Sheet ◽  
Sheet Thickness ◽  
Superficial Layer ◽  
Iron Casting ◽  
Casting Mold ◽  
Iron Castings ◽  
Sulfur Diffusion ◽  
Structure Evaluation

The main objective of this work is to investigate the mechanism of sulfur diffusion from the mold (sand resin P-toluol sulfonic acid mold, sulfur-containing acid) in liquid cast iron in order to limit the graphite degeneration in the surface layer of iron castings. A pyramid trunk with square section samples was cast. On the opposite side of the feed canal of the samples, steel sheets with different thicknesses (0.5, 1, and 3 mm) were inserted with the intention of blocking the diffusion of sulfur from the mold into the cast sample during solidification. The structure evaluation (graphite and matrix) in the surface layer and the casting body was recorded. The experimental results revealed that by blocking the direct diffusion of sulfur at the mold-casting interface, a decrease of the demodified layer thickness (for 0.5 mm steel sheet thickness) is obtained until its disappearance (for steel sheet thicknesses of more than 1 mm). The paper contains data that may be useful in elucidating the mechanism of graphite degeneration in the superficial layer of ductile iron castings. Based on the obtained results, we recommend using such barriers on the metal-mold interface, which are able to limit sulfur diffusion from the mold/core materials into the iron castings, in order to limit or even cease graphite degeneration in the Mg-treated surface iron casting layer. The paper presents additional data related to the interaction of sulfur at the ductile iron casting-mold interface previously analyzed.

Graphite degeneration in surface layer of ductile iron castings

2013 ◽  
Vol 26 (3) ◽  
pp. 138-142 ◽  
Author(s):  
N Ivan ◽  
M Chisamera ◽  
I Riposan
Keyword(s):  
Surface Layer ◽  
Ductile Iron ◽  
Iron Castings

ALLOYING OF THIN-WALL DUCTILE IRON CASTINGS

2016 ◽  
Author(s):  
Stephanie Tankersley
Keyword(s):  
Ductile Iron ◽  
Thin Wall ◽  
Iron Castings

Effect of rare earth element on microstructure formation and mechanical properties of thin wall ductile iron castings

2004 ◽  
Vol 383 (2) ◽  
pp. 323-333 ◽  
Author(s):  
J.O. Choi ◽  
J.Y. Kim ◽  
C.O. Choi ◽  
J.K. Kim ◽  
P.K. Rohatgi
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Rare Earth Element ◽  
Ductile Iron ◽  
Earth Element ◽  
Thin Wall ◽  
Microstructure Formation ◽  
Iron Castings

scholarly journals Experimental Evidence for Metallurgical Modification Associated to Chunky Graphite in Heavy-Section Ductile Iron Castings

2012 ◽  
Vol 6 (1) ◽  
pp. 35-42 ◽  
Author(s):  
J. Lacaze ◽  
I. Asenjo ◽  
S. Méndez ◽  
J. Sertucha ◽  
P. Larrañaga ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Ductile Iron ◽  
Iron Castings ◽  
Heavy Section ◽  
Chunky Graphite

scholarly journals Influence of Technological Parameters of Furane Mixtures on Shrinkage Creation in Ductile Cast Iron Castings

2014 ◽  
Vol 59 (3) ◽  
pp. 1037-1040 ◽  
Author(s):  
I. Vasková ◽  
M. Hrubovčáková ◽  
J. Malik ◽  
Š. Eperješi
Keyword(s):  
Cast Iron ◽  
Ductile Iron ◽  
Ductile Cast Iron ◽  
Gating System ◽  
Technological Parameters ◽  
Iron Castings ◽  
Steel Castings ◽  
The Impact ◽  
Very High ◽  
Great Development

Abstract Ductile cast iron (GS) has noticed great development in last decades and its boom has no analogue in history humankind. Ductile iron has broaden the use of castings from cast iron into areas, which where exclusively domains for steel castings. Mainly by castings, which weight is very high, is the propensity to shrinkage creation even higher. Shrinkage creation influences mainly material, construction of casting, gating system and mould. Therefore, the main realized experiment was to ascertain the influence of technological parameters of furane mixture on shrinkage creation in castings from ductile iron. Together was poured 12 testing items in 3 moulds forto determine and compare the impact of various technological parameters forms the propensity for shrinkage in the casting of LGG.

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