The Character of the Solidification Structure of Massive Ductile Cast-Iron Castings and its Prediction

2007 ◽  
Vol 567-568 ◽  
pp. 109-112
Author(s):  
Karel Stránský ◽  
Jana Dobrovská ◽  
František Kavička ◽  
Josef Stetina ◽  
Bohumil Sekanina ◽  
...  
Keyword(s):  
Cast Iron ◽  
Three Dimensional ◽  
Calculated Data ◽  
Ductile Cast Iron ◽  
Solidification Time ◽  
Solidification Structure ◽  
Local Solidification Time ◽  
Iron Castings ◽  
Basic Characteristics ◽  
Average Size

An original three-dimensional (3D) model of solidification is used to describe the process of solidification and cooling of massive 500x1000x500 mm cast-iron castings in sand moulds. The calculated model of the kinetics of the temperature field of the casting is verified during casting with temperature measurements in selected points. The following dependences are later determined according to the experimental and calculated data: the average size of the graphite spheroids rg, graphite cells Rb and the average distances among the particles of graphite Lg – always as a function of the local solidification time θ [xi, yi, zi]. Furthermore, it has been found that the given basic characteristics of the structure of the cast-iron (rg, Rb and Lg) are a linear function of the logarithm of the local solidification time θ. The original spatial model of solidification can therefore be used in its first approximation for the assessment of the pouring structure of massive cast-iron castings.

The Character of the Solidification Structure of Massive Ductile Cast-Iron Castings and its Prediction

2007 ◽  
pp. 109-112
Author(s):  
Karel Stránský ◽  
Jana Dobrovská ◽  
Frantisek Kavicka ◽  
Josef Stetina ◽  
Bohumil Sekanina ◽  
...  
Keyword(s):  
Cast Iron ◽  
Ductile Cast Iron ◽  
Solidification Structure ◽  
Iron Castings

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.

Influence of Charge Composition on EN-GJS-500-7 Ductile Iron Properties in Foundry Operating Conditions

2020 ◽  
Vol 998 ◽  
pp. 42-47
Author(s):  
Alena Pribulová ◽  
Peter Futaš ◽  
Marcela Pokusova
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Ductile Iron ◽  
Ductile Cast Iron ◽  
Operating Conditions ◽  
Production Costs ◽  
Steel Scrap ◽  
Charge Composition ◽  
Iron Castings ◽  
Worldwide Production

Worldwide production of ductile iron castings reached in year 2017 26,428,148 metric tons, which is 34% of the total weight of all castings made from cast iron. The most significant increase in ductile iron castings was recorded in Slovakia, up to 78.6%. Castings from ductile iron have a very huge utilization thanks their very good foundry and mechanical properties. The current economic situation in all industries forces entrepreneurs and producers to rationalize production and reduce production costs, with a worldwide trend to increase the share of steel scrap, a technology for the production of ductile cast iron. The paper describes the results of research focused on the effect of charge composition, mainly the share of scrap steel on the final properties and structure of ductile iron EN-GJS-500-7 under the operating conditions of foundry. Six melts with different charge composition were made. The samples from all melts were taken and chemical analysis, microstructure analysis and testing on mechanical properties were made on them. The mechanical properties of produced globular cast irons were according with the relevant standard. It is important to mention that there has been a significant increase in strength characteristics in melts in which the carbon content exceeded 4% (CE = 4.7 and 4.8%, respectively).

Time Evolution of Solidification Structure in Ductile Cast Iron with Hypereutectic Compositions

2020 ◽  
Vol 14 (3) ◽  
pp. 794-801
Author(s):  
Kiattisaksri Chatcharit ◽  
Akira Sugiyama ◽  
Kohei Morishita ◽  
Taka Narumi ◽  
Kentaro Kajiwara ◽  
...  
Keyword(s):  
Cast Iron ◽  
Time Evolution ◽  
Ductile Cast Iron ◽  
Solidification Structure

Temperature Field and Solidification Structure of a Ductile-Cast-Iron Roller

2013 ◽  
Vol 592-593 ◽  
pp. 197-200
Author(s):  
František Kavička ◽  
Jana Dobrovská ◽  
Karel Stránský ◽  
Bohumil Sekanina ◽  
Josef Stetina
Keyword(s):  
Temperature Field ◽  
Cast Iron ◽  
Structural Heterogeneity ◽  
Ductile Cast Iron ◽  
Solidification Structure ◽  
Heat Flows ◽  
Working Rollers ◽  
Original Application ◽  
Kinetics Of

The quality of the working rollers from ductile-cast-iron used for rolling rails is determined by the chemical and structural composition of the material of the rollers and the production technology. The requirements of the quality cannot be ensured without perfect knowledge of the course of solidification, cooling and heat treatment of the cast rollers as well as the kinetics of the temperature field of the casting and mould. An original application of ANSYS simulated the forming of the temperature field of the entire system comprising the casting, the mold and ambient. In the experimental investigation of temperature field, an original methodology for the measurement of the distribution of temperatures and heat flows in the roller-mould system had been developed and verified in the operation. The kinetics of the solidification has a measurable and non-negligible influence on the chemical and structural heterogeneity of the investigated type of ductile-cast-iron. Tying on to the results of the model of the temperature field of the cast rollers, an original methodology was developed for the measurement of chemical microheterogeneity. The chemical and structural heterogeneity of the cast roller is therefore a significant function of the method of melting, modification and inoculation and the successive procedures of risering, casting and crystallization after cooling.

scholarly journals Three-dimensional local residual stress and orientation gradients near graphite nodules in ductile cast iron

2016 ◽  
Vol 121 ◽  
pp. 173-180 ◽  
Author(s):  
Y.B. Zhang ◽  
T. Andriollo ◽  
S. Fæster ◽  
W. Liu ◽  
J. Hattel ◽  
...  
Keyword(s):  
Residual Stress ◽  
Cast Iron ◽  
Three Dimensional ◽  
Ductile Cast Iron

Research on Cored Wire Re-Sulfurization Injection for Compacted Graphite Cast Iron

2015 ◽  
Vol 727-728 ◽  
pp. 231-234
Author(s):  
Yu Shuang Feng ◽  
Ze Sheng Ji ◽  
He Sheng Wu
Keyword(s):  
Cast Iron ◽  
Automotive Industry ◽  
Ductile Cast Iron ◽  
Application Process ◽  
Cored Wire ◽  
Injection Speed ◽  
Compacted Graphite ◽  
Iron Castings ◽  
Graphite Cast Iron ◽  
Engineering Industries

To promote the application process of compacted graphite cast iron in non-automotive industry, cored wire re-sulfurization injection was developed for the production of compacted graphite cast iron. Firstly, ductile cast iron was produced by cored wire injection. Then, the effective final residual Mg level was reduced to the appropriate range for compacted graphite formation by feeding sulfidizing cored wire containing 99% S. In this paper, the influencing factors on percentage of compacted graphite were analysed, such as the final residual Mg level, cored wire injection speed. The results show that compacted graphite cast iron with less than 20% nodularity can be produced steadily on the condition of adopting the correct speed and the added sulfidizing cored wire in the range from 0.8m/t to 0.9m/t. Practice has proven that cored wire re-sulfurization injection would be most appropriate for jobbing foundries intending to manufacture compacted graphite cast iron castings for engineering industries.

scholarly journals Technology of thin-walled ductile cast iron castings obtaining in coated metal moulds with the use of in-mold melt modifying

2021 ◽  
Vol 29 (1) ◽  
pp. 46-53
Author(s):  
V.B. Bublikov ◽  
◽  
A.V. Narivskyi ◽  
Yu.D. Bachynskyi ◽  
◽  
...  
Keyword(s):  
Cast Iron ◽  
Ductile Cast Iron ◽  
Iron Castings ◽  
Coated Metal ◽  
Thin Walled

scholarly journals The Impact of Process Factors on Creating Defects, Mainly Lustrous Carbon, during the Production of Ductile Iron Using the Lost-Foam Casting (LFC) Method

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1022
Author(s):  
Jan Jezierski ◽  
Michał Jureczko ◽  
Rafał Dojka
Keyword(s):  
Cast Iron ◽  
Ductile Iron ◽  
Surface Defects ◽  
Ductile Cast Iron ◽  
High Tech ◽  
Lost Foam Casting ◽  
Iron Castings ◽  
Process Factors ◽  
The Impact ◽  
Lost Foam

The purpose of this paper was to analyze the process factors affecting the occurrence of lustrous carbon defects in ductile cast iron castings when using the lost-foam casting (LFC) method. This phenomenon results in creating raw surface defects, which sometimes may even lead to cast iron scrapping. A series of trial melting batches were carried out for variable process assumptions. The analysis was performed to reflect, to the greatest extent possible, real foundry production conditions. Industrial tests were performed in Odlewnia Rafamet Sp. z o.o., Kuźnia Raciborska, Poland. The polystyrene patterns created by gluing components together, used in the tests, met the requirements of the high-tech lost-foam casting (LFC) process. The performed analysis allowed the obtaining of lustrous carbon defects in test castings as well as the determination of the process parameters with the highest impact on lustrous carbon inclusions in ductile iron castings. The test results were used to eliminate the possibility of creating a defect and thus directly improve the efficiency of the lost-foam casting (LFC) process used in the foundry.

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