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Effect of the AlCr20 Addition on the Microstructure of Secondary AlSi7Mg0.3 Alloy

Bolibruchova D., Richtarech L.

Archives of Foundry Engineering

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2014

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Vol. 14, iss. 2

9--12

EN

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.

2

Analysis of the microstructure of 37MnMo6-3 hypoeutectoid steel

Rożniata E., Dziurka R.

Archives of Materials Science and Engineering

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2012

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Vol. 58, nr 2

125--129

EN

Purpose: Present work corresponds to the research on the analysis of the microstructure of 37MnMo6-3 hypoeutectoid steel. Own research concerns the analysis of the influence of austenitizing temperature on the hardness of the 37MnMo6-3 hypoeutectoid test steel, and on the grain size of former austenite. The paper presents metallographic research, measurements of the average diameter of austenite grain, as well as hardness measurements. Design/methodology/approach: The austenitising temperature was defined in a standard way i.e. 30-50°C higher than Ac3 temperature for model alloy. A technique of full annealing was proposed for the model alloy. Metallographic examinations were performed on a Carl Zeiss light microscope Axiovert 200 MAT. Hardness measurements was performed with a Vickers apparatus of HPO 250 type, which imposes a force equal to 30 kG. Findings: Material for investigations was 37MnMo6-3 steel delivered in as-cast condition after casting in the Faculty of Foundry Engineering of AGH University of Science and Technology in Cracow then reforged in INTECH-MET S.C. in Gliwice. Research limitations/implications: The new Mn-Mo iron based model alloy. Practical implications: The paper contains a description of one from a group of iron based model alloys with 0.35-0.40% carbon content. According to PN-EN 10027 standard this steel should have a symbol 38MnNi6-4.

3

Oznaczanie wysokich zawartości aluminium w stalach i stopach Fe-Al

Wyciślik A.

Hutnik, Wiadomości Hutnicze

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2009

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Vol. 76, nr 9

706-708

PL

W artykule przestawiono metodę oznaczania aluminium w stalach i stopach Fe-Al w zakresie stężeń od 5 % do % 50 %. Próbki do badań roztwarzano w kwasie chlorowodorowym, następnie dotopiono nierozpuszczalną pozostałość z pirosiarczanem potasu. Oddzielono aluminium od żelaza wodorotlenkiem sodu w postaci glinianu i związano aluminium nadmiarem EDTA w związek kompleksowy. Odmiareczkowano nadmiar EDTA roztworem soli cynku wobec oranżu ksylenolowego jako wskaźnika. Rozłożono związek kompleksowy przez związanie aluminium w fluoroglinian sodu i zmiareczkowano uwolniony EDTA roztworem soli cynku.

EN

In this paper the procedure for the determination of aluminum in steels and in Fe-Al alloys in concentration range from 5 % to 50 % has been presented. The samples were dissolved in hydrochloric acid, then. the undissolved precipitate is fused with potassium pyrosulfate. Aluminum is separated from iron using sodium hydroxide in form of aluminate and bonded aluminum with EDTA as complex compound. EDTA is back titrated by zinc salt solution using xylene orange as the indicator. The complex compound is decomposed by bonding aluminum in form of sodium fluoroaluminate and released EDTA is titrated with zinc salt solution.