Search Results

You are looking at 1 - 10 of 29 items for

  • Author: E. Guzik x
Clear All Modify Search
Open access

E. Guzik and D. Wierzchowski

Modern Cored Wire Injection 2PE-9 Method in the Production of Ductile Iron

The results of studies on the use of modern two cored wires injection method for production of nodular graphite cast iron with use of unique implementation of drum ladle as a treatment/ transport and casting ladle instead vertical treatment ladle was described. The injection of length of ϕ 9mm wires, cored: in FeSi + Mg nodulariser mixture and inoculant master alloy is a treatment method which can be used to produce iron melted in coreless induction furnace. This paper describes the results of using this method for possibility production of ductile iron under specific industrial conditions. In this case was taken ductile iron with material designation: EN-GJS-450-10 Grade according PN-EN 1563:2000. Microstructure of 28 trials was controlled on internally used sample which has been correlated with standard sample before. The paper presents typical metallic matrix and graphite characteristic. Additionally, mechanical properties were checked in one experiment. Because of further possibility treatment temperature reduction only the rough magnesium recovery and cost of this new method are given.

Open access

E. Guzik and D. Wierzchowski

Abstract

Below are described results of the analysis concerning the use of two cored wire injection method (2PE- 9) and the unique application of a drum ladle as a treatment, transport and casting one, instead of a vertical treatment ladle. Parameter optimization, like: length of nodulariser wire, residual magnesium content, treatment and pouring temperature have been shown. Influence of various treatment temperatures, magnesium-cored wire velocities (Mg-treatment times) and weights of molten alloy on magnesium recovery are demonstrated. Moreover, graphite nodule content in relation to different raw materials in the charge mix are presented. Typical microstructure, mechanical properties and treatment costs are given as well. Using specific industrial conditions for tests and optimal, low scrap production of austenitic nodular cast iron (EN-GJSA-XNiSiCr35-5-2 Grade, according with EN 13835), makes this innovative method very credible. Injection of two Ø 9 mm wires; cored in FeSi + Mg nodulariser mixture and inoculant master alloy into a drum ladle is a treatment method that can be used for the production of ductile iron melted in a coreless induction furnace.

Open access

D. Kopyciński, E. Guzik and A. Szczęsny

Abstract

It has been proved that an addition of boron carbide and shredded steel scrap introduced as an inoculants to the chromium white cast iron changes the microstructure of castings. The operation increases the number of crystallization nuclei of M7C3 carbides. In this case the B4C carbides act as substrates for the nucleation of M7C3 (chromium carbides). Castings after B4C inoculation have fine grain fracture surface. Primary precipitates of chromium carbide also appeared, lowering the mechanical properties of as-cast parts. Additionally, in order to increase the mechanical properties of chromium cast iron, unidirectional solidification was used. In this case, 0.3 wt. % cerium was used as inoculant.

Open access

E. Guzik, D. Kopyciński and D. Wierzchowski

Abstract

The use of two cored wire injection methods (2PE- 9) and the unique application of a drum ladle as a treatment, transport and casting one, instead of a vertical treatment ladle are presented. Optimization parameters, like: length of nodulariser wire, treatment and pouring temperature have been shown. The influence of various treatment temperatures on magnesium recovery is demonstrated. The typical microstructure, mechanical properties and cost calculation of the ferritic ductile cast iron (type SiMo - EN-GJS-SiMo40-6 Grade) production according to EN 16124:2011 (E) are presented. Injection of two Ø 9 mm as well wires; cored in FeSi + Mg nodulariser mixture and inoculant master alloy into a drum ladle is a treatment method that can be used for the production of ferritic ductile cast iron (SiMo) melted in a coreless induction furnace.

Open access

A. Guzik, E. Talik, A. Pajączkowska, S. Turczyński and J. Kusz

Abstract

Monocrystalline fibres of undoped PrAlO3 and PrAlO3:0.1 Mn, have been grown by the pulling-down method under nitrogen atmosphere. The as-grown crystal doped with Mn had a visible brown core surrounded by a green ring, whereas this effect was weaker for the undoped PrAlO3. A coloration of the brown core was caused by a presence of Pr4+ ions. The presence of the Pr4+ ions was confirmed by XPS and magnetic studies. The XPS chemical analysis showed the increased concentration of oxygen in the crystals with the brown core. The most probable valency of manganese is Mn4+. It is located in Al3+ sites.

Open access

D. Kopyciński and E. Guzik

Abstract

A model of the (Zn) – coating formation on the iron/steel substrate is proposed. The model assumes the phases’ sub-layers creation in a sequence. This sequence is referred to the Fe-Zn phase diagram. However, this sequence of phases’ appearance is perturbed by the flux presence in the zinc bath. The flux effect on the coating morphology and appearance/disappearing of some sub-layers is analysed. The phases’ formation is treated as the result of the peritectic reaction accompanying the coating solidification. A comparison of the coating formations before and after flux decay is delivered. Thus, a function which describes the flux decay is also analysed. Additionally, a ternary Fe-Zn-F(flux) phase diagram is considered. The varying zinc concentration across the phases sub-layers is described with the use of the function which determines the flux decay. The behaviour of the solidification path before and after flux decay is discussed due to the adequate equations formulated in frame of the current model.

Open access

E. Guzik, D. Kopyciński and W. Wołczyński

Abstract

Some experiments dealing with the isothermal hot dip galvanizing were carried out. The (Zn) – coating settled on the Armco-iron substrate were examined after arresting the solidification for different periods of time. The measurement of the thickness of each sub-layer in the coating were performed due to the SEM – analysis. The zinc segregation on the cross-section of the studied sub-layers were also determined by the EDS technique. The growth laws are formulated mathematically for each of the observed sub-layer. The mechanism of the sub-layer formation is also analysed due to the observation of the birth/nucleation of the phases in the sub-layers and the effect of flux onto the sub-layers morphology formation. The appearance of each phase is referred to the Fe-Zn diagram for stable equilibrium according to which these phases are the products of the adequate peritectic transformation.

Open access

D. Kopyciński, D. Siekaniec, A. Szczęsny, E. Guzik and A. Nowak

Abstract

The results of studies of the effect of different amounts of the Fe-Ti inoculant on structure and selected mechanical properties of High Chromium Cast Iron (conventionally abbreviated as HCCI) are presented. The main purpose of the inoculation is structure refinement and hence the improvement of casting properties. Generally considered a strong carbide-forming element, titanium is an effective inoculant for the high chromium cast iron. However, there is an optimal amount of titanium addition beyond which the mechanical properties begin to deteriorate. The studies enabled determining the amount of Fe-Ti inoculant optimal for the cast iron of a given chemical composition.

Open access

A. Szczęsny, D. Kopyciński and E. Guzik

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.

Open access

D. Kopyciński, E. Guzik and A. Szczęsny

Abstract

The paper presents the results of investigations of the growth of protective coating on the surface of ductile iron casting during the hot-dip galvanizing treatment. Ductile iron of the EN-GJS-600-3 grade was melted and two moulds made by different technologies were poured to obtain castings with different surface roughness parameters. After the determination of surface roughness, the hot-dip galvanizing treatment was carried out. Based on the results of investigations, the effect of casting surface roughness on the kinetics of the zinc coating growth was evaluated. It was found that surface roughness exerts an important effect on the thickness of produced zinc coating.