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.

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

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 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.

Effect of Yttrium and Magnesium Segregation on Microstructure and Mechanical Properties of Heavy Section Ductile Iron Castings

2011 ◽  
Vol 295-297 ◽  
pp. 1010-1016 ◽  
Author(s):  
Wei Ping Chen ◽  
Zhe Liu ◽  
Yu Deng ◽  
Jie Luo ◽  
Yong Cheng Chen
Keyword(s):  
Mechanical Properties ◽  
Ductile Iron ◽  
Magnesium Content ◽  
Solidification Mode ◽  
Iron Casting ◽  
Iron Castings ◽  
Microstructure And Mechanical Properties ◽  
Chunky Graphite ◽  
Main Factor ◽  
Ductile Iron Casting

Ductile iron specimen with dimensions of Φ590mm×800mm were prepared by treating the melt with an yttrium-containing nodulizer. Cooling curves at four locations____the center location, the location 85mm distant from the center, the location 170mm distant from the center and the location 255mm distant from the center of the heavy ductile iron casting Φ590mm×800mm was obtained. The effect of yttrium and magnesium on microstructure and mechanical properties was investigated, and the factors on the distribution of chunky graphite in the specimen were discussed as well. The results show that the largest amount of chunky graphite and the lowest mechanical properties appear at the location 170mm distant from the center. Excessive yttrium and magnesium content at the location 170mm distant from the center is the main factor for the large amount of chunky graphite. The characteristics of the solidification mode____pasty solidification and the considerably long solidification of the casting are the basic reasons for the distribution of chunky graphite of the heavy ductile iron casting Φ590mm×800mm.

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

Effect of Coating Layer of Sand Casting Mold in Thin-Walled Ductile Iron Casting: Reducing the Skin Effect Formation

2017 ◽  
Vol 12 (2) ◽  
pp. 362-369 ◽  
Author(s):  
Donanta Dhaneswara ◽  
Bambang Suharno ◽  
Rianti Dewi S. Ariobimo ◽  
Djodi Budi Sambodo ◽  
Jaka Fajar Fatriansyah
Keyword(s):  
Ductile Iron ◽  
Skin Effect ◽  
Coating Layer ◽  
Sand Casting ◽  
Iron Casting ◽  
Casting Mold ◽  
Thin Walled ◽  
Ductile Iron Casting

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

Improvement of the properties of the surface layer of cast iron castings

2020 ◽  
pp. 52-55
Author(s):  
F.R. Rasulov
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Surface Layer ◽  
Cast Iron ◽  
Surface Alloying ◽  
Casting Mold ◽  
Powder Composition ◽  
Iron Castings ◽  
Composite Casting ◽  
Mechanical Properties And Corrosion

The possibility of improving the mechanical properties and corrosion resistance of the casting surfaces is being considered. The impregnation of the powder composition with liquid iron when it is poured into a casting mold to obtain surface-alloyed castings with a low content of chromium and nickel is proposed. Keywords: surface alloying, powder composite, casting, casting mold, pasting. [email protected]

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