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Effect of repeated remelting on the chemical composition and structure of nickel alloys

100%

Binczyk F. , Śleziona J. , Mikuszewski T.

Archives of Foundry Engineering

2010

tom Vol. 10, iss. 1 spec.

189--194

The results of preliminary tests and studies on the effect of repeated remelting of selected nickel alloys on changes in the chemical composition and structure were presented. The aim was to investigate possible management and utilisation of post-production waste (rejects, parts of the gating system, etc.). It has been reported that repeated remelting of IN-713C alloy had no significant effect on changes in its chemical composition. Only aluminium slightly reduced its content due to melting loss, as confirmed further by the results of ATD thermal analysis. On the other hand, in MAR-247 alloy after remelting, a decrease in the content of Cr, Ta, Hf, and C in particular, was observed. To re-use the post-production waste, it is necessary to make up the content of some elements (especially trace elements) and carry out the modification process.

Macrostructure of IN-713C superalloy after volume modification

67%

Binczyk F. , Śleziona J.

Archives of Foundry Engineering

2009

tom Vol. 9, iss. 2

105-108

The study discusses the results of the preliminary investigations of the process of volume modification of nickel and cobalt superalloys. The investigations were carried out on an IN-713C alloy. As an inoculant, cobalt aluminate CoAl2O4 in composition with aluminium powder and zircon flour was used. Experiments included the use of inoculant-coated filters and inoculant placed on and between the filters. As a criterion for evaluation of the modification effect, the macrostructure produced in a stepped test casting was used. It has been concluded that the modification effect depends, first of all, on the pouring temperature and on the time of contact between the liquid alloy and inoculant. Compared with the non-modified alloy, which has columnar grains in its structure, the refining treatment gave very fine and equiaxial grains. The higher was the cooling rate (or the smaller was the thickness of the step), the finer were the equiaxial grains.