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3 Archives of Foundry Engineering

3 2010

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w słowach kluczowych: innovative materials in foundry

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Computer aided process of dimensional distortion determination of bounded plaster sandmix Part II

100%

Pawlak M. , Niedźwiedzki Z.

tom Vol. 10, iss. 1

105-108

A computer program allowing calculation of dimensional changes of mould made of cristobalite-gypsum composition in process of its heat treatment and preparation for molten metal casting is presented in this paper. The composition of the mixture and casting temperature to obtain cast of predetermined dimensions can be calculated using presented software. The base for program elaboration were the results of dilatometric test of bounded plaster sandmix composed of half hydrate [alpha]-CaSO_4 x 0,5H_2O of various cristobalite ratio. Approximation was carried out in the range of temperatures 100 - 700°C.

Bainite obtaining in cast iron with carbides castings

80%

Pietrowski S. , Gumienny G.

tom Vol. 10, iss. 1

109-114

In these paper the possibility of upper and lower bainite obtaining in cast iron with carbides castings are presented. Conditions, when in cast iron with carbides castings during continuous free air cooling austenite transformation to upper bainite or its mixture with lower bainte proceeds, have been given. A mechanism of this transformation has been given, Si, Ni, Mn and Mo distribution in the eutectic cell has been tested and hardness of tested castings has been determined.

Solidification of superalloys in shell moulds and its numerical simulation

80%

Roučka J. , Kováč M. , Odložil J. , Hrbáček K.

tom Vol. 10, iss. 1

137-146

The paper presents the results of the experiments on the solidification of superalloys in shell moulds. The analysis of heat transfer during the solidification of castings in ceramic moulds was carried out theoretically and confirmed by the results of earlier experiments conducted on model shells. Results of experimental temperature measurement were compared with numerical calculations (performed using the ProCast software) and corrections of the calculation parameters were proposed. A model of structure simulation was verified on a selected real casting. It can be assumed that simulating the structure will be a theoretically and computationally demanding problem.