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Fatigue Properties of AlSi7Mg Alloy with Diversified Microstructure

Tupaj M., Orłowicz A. W., Mróz M., Trytek A.

Archives of Foundry Engineering

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2015

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Vol. 15, iss. 3 spec.

87--90

EN

The paper discusses the effect of microstructure on the fatigue strength of AlSi7Mg casting alloy refined conventionally with hexachloroethane without modifying and modified with TiB and Na. Castings made of both alloy variants were subjected to T6 heat treatment. It turned out that the applied refining secured satisfactory compactness of the material. In view of absence of gas and shrinkage porosity in the castings, short cracks nucleated on largest silicon precipitates and largest intermetallic phase precipitations as these were the locations where stress concentrations reached their highest values. Comprehensive modification of the alloy resulted in reduction of the value of SDAS parameter characterizing α(Al) phase dendrites, a decrease of the distance between silicone precipitates in the eutectic λE, and a decrease of the maximum size of silicone precipitates lmaxSi. The ultimate effect of these changes was an increase of the fatigue strength.

2

Researching the Influence of Chemical Composition and Technological Parameters on the Quality of Copper Alloys

Rzadkosz S., Kozana J., Kranc M.

Archives of Foundry Engineering

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2013

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Vol. 13, iss. 1 spec.

153--158

EN

The work presents the results of process efficiency of refining liquid copper with special refining agents and the analysis results of the influence of alloying components on the structure and properties of the chosen alloys. The research undertaken aimed at evaluation of the influence of alloying additives, such as aluminium, silicon and also cobalt in the chosen Cu-Zn alloys. The microstructures were researched with the help of light and scanning microscopy together with X-ray microanalysis to determine significant changes of mechanical properties.

3

Effect of modification with strontium on machinability of AK9 silumin

Pezda J.

Archives of Foundry Engineering

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2008

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Vol. 8, iss. 1 spec.

273--276

EN

Aluminum and its alloys, except iron alloys, found nowadays the broadest application in any type of design structures. Modern technologies, as well as tendencies aimed at the broadest possible use of light alloys - Al-Si mainly - call for more and more rigorous requirements. These requirements concern not only mechanical properties, but also technological features like: castability, capability to be fed of the casting, tightness, machinability. Automation of production, being result of mass series production, effects in increased requirements concerning properties of starting material, inclusive of machinability mainly. The paper presents a preliminary results of AK9 alloy machinability, subjected to typical treatments of refining and modification. Measurement of machnability of investigated alloy was performed with use of reboring method, with fiat drill and constant feed force. It has enabled to determine a correlation between implemented enrichment treatments and machinability of investigated alloy. Further investigations shall be connected with determination of machinability of heat treated alloy and determination of optimal parameters of enrichment treatments in aspect of machining operations of casting made from AK9 alloy.

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Racjonalne zasady rafinacji stopów miedzi

Bydałek A. W., Bydałek A., Czyż M.

Krzepnięcie Metali i Stopów

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2000

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R. 2, nr 43

65--71

PL

Materiały badawcze opisujące odlewnicze procesy rafinacji miedzi i jej stopów przedstawiają się, w odróżnieniu do metalurgii stopów żelaza i aluminium, nadzwyczaj skromnie. Podczas gdy w stalownictwie wyjaśnione zostały wszystkie podstawowe zagadnienia związane z obróbką w stanie ciekłym, tu nie doczekały się nawet rozstrzygnięcia rozbieżności poglądów dotyczących podstawowego ustalenia - stosowania utleniających czy redukujących warunków topienia. Nie wykorzystane prawie, a wynikające z wymienionej wątpliwości, drogi optymalizowania zdolności rafinowania od zanieczyszczeń niemetalicznych powinny być rozpatrywane w powiązaniu z możliwością równoczesnego modyfikowania tak metalicznych jak i niemetalicznych składników struktury pierwotnej.