スチームタービン用ローター材に関する二,三の考察

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Along with the recent tendency of thermal engines becoming higher in efficiencies, acting gas temperature has become higher year by year, and the indications are that the steam temperature of 566℃ for steam turbine is about to attain the stage of practicability while steam temperature of 650~750℃ for gas turbine and that of 800~900℃ for jet aircraft engine have become in practical use. As for the research tendency of heat resistance materials, super alloys are now being actively developed. However, ferritic steels are being used in large quantities as they are suited for the medium temperatures of 538~600℃, beside being important from the economic viewpoint. But their effective data as the base for designing are still lacking. The author, therefore, has investigated the trend of the developments of plants for marine and land uses, studied the recent cases of the failure of large forged rotors and thus has made some observations concerning the problems about the evaluation of high temperature properties of ferritic steels suitable for medium temperatures. The salient points of the author's studies may be summed up as follows : 1) The steam temperature of the plant for marine or land use rises at an average of 6・5℃/Yr. and at present the temperature of 538℃~566℃ for land plants is now being used in practise but so far as the plant for marine use is concerned, the temperature for practical use is no higher than 538℃~566℃. In order to compete with the diesel engines which are becoming larger and more powerful, the steam temperature of the plants for marine use has to be increased to 538~566℃ degree within a few years, viewed from the stand point of fuel economy. 2) Examining the examples of large type forged rotors, the author has found many cases resulting from segregation and hydrogen embittlement. Concerning the problem of the hydrogen embrittlement of large type forged rotors, it seems that it might be solved with the introduction of the method of stream degassing in vacuum.
社団法人日本材料学会の論文
1960-02-15

著者

前田徳美
川崎重工業(株)技術研究所

スチームタービン用ローター材に関する二,三の考察

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