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Investigation on Reactions at Corners of Cast Part during Investment Casting of Reactive AZ91 Magnesium Alloy

Vyas Akash V., Sutaria Mayur .

Archives of Foundry Engineering

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2020

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Vol. 20, iss. 4

139--144

EN

The magnesium alloy investment castings have greater potential for automobile and air-craft applications due to the higher strength to weight ratio of magnesium alloys and capability of the investment casting process to produce near net shape complex castings. The interfacial-mould metal reactions during investment casting of magnesium alloy inhibit successful production of quality castings. This paper presents the investigation done on the reactions at corners of AZ91 magnesium alloy cast part produced through investment casting. The stepped shape geometry of casting was selected to study the reactions at convex and concave corners of the cast part. The reacted surfaces were characterised using the SEM-EDX and XRD. The formation of oxides was observed on cast surface from characterisation. The temperature profile recorded at corners were helpful to understand the heat dissipation during the solidification of metal at corners. It was observed that the reactions occurred at the concave corner were more as compared to the convex corner of the cast part.

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Wpływ czynników produkcyjnych na jakość wysokociśnieniowych odlewów wykonanych ze stopów z grupy Al-Si - analiza z wykorzystaniem diagramu Ishikawy

Poloczek Ł., Kiełbus A.

Zarządzanie Przedsiębiorstwem

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2018

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Vol. 21, nr 4

2--8

EN

Production of products required by the customer quality is one of the most important issues related to the management company. So far, quality control of the product was carried out at the end of the production process. It is increasingly giving way to projects aimed at bringing about a situation in which the number of defective products will be significantly reduced. In this situation, it becomes necessary to take action to identify the causes of major importance for the final result of the production process. For this purpose they are increasingly used quality management tool. The article presents the use of Ishikawa cause-effect diagram to identify the causes of casting defects in high pressure die casting Al-Si alloys.

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Late modifying possibilities in solidification investigation and for high quality casts

Titova T. M., Stovpchenko A. P.

Archiwum Odlewnictwa

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2001

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R. 1, nr 1

127--132

EN

The solution of the problem of casting quality improvement depends first of all on the methods and techniques used to make effect on the melt bath during pre-crystallization period and solidification process of metal. The authors’ investigations have shown that the late microalloying and modification of steel are one of the most effective methods of influence on the melt during solidification.

PL

Rozwiązanie kwestii udoskonalenia jakości odlewania zależy przede wszystkim od stosowanych metod i zabiegów technologicznych na ciekłej kąpieli dla uzyskania odpowiednich efektów w okresie przed krystalizacją i podczas krzepnięcia metalu. Badania autorów pokazały, że późne wprowadzanie mikrostopów i modyfikowanie stali są jednymi z najbardziej efektywnych metod oddziaływania na ciekły metal podczas krzepnięcia.