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Abstract

This paper deals with influence on segregation of iron based phases on the secondary alloy AlSi7Mg0.3 microstructure by nickel. Iron is

the most common and harmful impurity in aluminum casting alloys and has long been associated with an increase of casting defects. In

generally, iron is associated with the formation of Fe-rich intermetallic phases. It is impossible to remove iron from melt by standard

operations. Some elements eliminates iron by changing iron intermetallic phase morphology, decreasing its extent and by improving alloy

properties. Realization of experiments and results of analysis show new view on solubility of iron based phases during melt preparation

with higher iron content and influence of nickel as iron corrector of iron based phases.

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Authors and Affiliations

M. Brůna
L. Richtárech
D. Bolibruchová
J. Caiss
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Abstract

This paper deals with influence on segregation of iron based phases on the secondary alloy AlSi7Mg0.3 microstructure by chrome. Iron is

the most common and harmful impurity in aluminum casting alloys and has long been associated with an increase of casting defects. In

generally, iron is associated with the formation of Fe-rich phases. It is impossible to remove iron from melt by standard operations, but it is

possible to eliminate its negative influence by addition some other elements that affect the segregation of intermetallics in less harmful

type. Realization of experiments and results of analysis show new view on solubility of iron based phases during melt preparation with

higher iron content and influence of chrome as iron corrector of iron based phases. By experimental work were used three different

amounts of AlCr20 master alloy a three different temperature of chill mold. Our experimental work confirmed that chrome can be used as

an iron corrector in Al-Si alloy, due to the change of intermetallic phases and shortening their length.

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Authors and Affiliations

D. Bolibruchová
L. Richtárech
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Abstract

This paper deals with influence of chrome addition and heat treatment on segregation of iron based phases in the secondary alloy

AlSi7Mg0.3 microstructure by chrome and heat treatment. Iron is the most common and harmful impurity in aluminum casting alloys and

has long been associated with an increase of casting defects. In generally, iron is associated with the formation of Fe-rich intermetallic

phases. It is impossible to remove iron from melt by standard operations, but it is possible to eliminate its negative influence by addition

some other elements that affect the segregation of intermetallics in less harmful type or by heat treatment. Realization of experiments and

results of analysis show new view on solubility of iron based phases during melt preparation with higher iron content and influence of

chrome as iron corrector of iron based phases.

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Authors and Affiliations

D. Bolibruchová
L. Richtárech
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Abstract

The article presents the most important causes of the unstable connection between cast iron ring inserts and the silumin casting of an engine piston. It is shown that manufacturing defects are mainly related to the alfin processing of inserts in Al-Si alloy (the so-called AS9 alloy). Exceeding the permissible iron content in AS9 alloy causes the crystallization of brittle -Al5FeSi phases. Their unfavorable morphology and large size are the main reasons for the weakening of the diffusion connection between the inserts and the piston, causing an unacceptable proportion of defective products. The study presented in this work was conducted under industrial conditions on a population of 10.000 pistons. Quality control data, production parameters, as well as the micro- and macro-structures of the cast iron inserts, and the interface area between the inserts and the silumin piston, were analyzed. Material and technological solutions have been proposed to reduce the occurrence of casting defects at the insert-piston joint. This includes the introduction of so-called "morphological correctors" of the -Al5FeSi phases, reducing the possibility of gaseous impurities in the AS9 alloy and optimizing the temperature of the alfin alloy.
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Authors and Affiliations

M. Szucki
1
ORCID: ORCID
J. Piątkowski
2
ORCID: ORCID
M. Czerepak
3

  1. Foundry Institute, Technische Universität Bergakademie Freiberg, Bernhard-von-Cotta-Str. 4,09599 Freiberg, Germany
  2. Department of Material Technologies, Silesian University of Technology, Krasińskiego 8, 40-019 Katowice, Poland
  3. Federal-Mogul Gorzyce sp. z o.o., Odlewników 52, 39-432 Gorzyce, Poland

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