Abstract
AT the meeting of the Institute of Metals held in London on September 17, a number of interesting papers were read and discussed. Amongst these were the following:—“Specifications for Alloys for High-speed Superheated Steam Turbine Blading,” by W. B. Parker. In this paper the author confines his attention to a consideration of the non-ferrous alloys which are used for turbine blading. He gives a clear description of the physical and chemical properties which are essential for this purpose, and discusses in detail the causes of the wearing and corrosion of the blades. It is pointed out that although non-ferrous alloys have the advantage of being non-rusting, they do not possess a good proportional limit which is capable of being retained for long periods when exposed at the temperature of highly superheated steam. This fact has so far prevented the use of non-ferrous alloys for this particular purpose, and steel alloys are invariably utilised. The proportional limit should remain, for temperatures between 100° and 450° C., within 10 per cent, of its value at the ordinary temperature. Investigation is, therefore, needed, in order to find either (i) a non-ferrous alloy which will almost indefinitely retain its hardness up to a temperature of 450°C., or (2) a steel which will fulfil the above requirements and also be non-rusting. Anyone conducting research along these lines will find Mr. Parker's paper extremely valuable.
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The Institute of Metals . Nature 96, 156 (1915). https://doi.org/10.1038/096156a0
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DOI: https://doi.org/10.1038/096156a0