タービン軸用鋼材の熱膨張率および炭化物におよぼす熱処理の影響

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タイトル別名
  • The Influence of Heat Treatment on the Thermal Expansion Coefficient and Carbides of Steel for Turbine Shafts. (Studies on the Reversible Deflection of Turbine Shaft, 1st Report)
  • タービンジクヨウ コウザイ ノ ネツ ボウチョウリツ オヨビ タンカブツ ニ オヨボス ネツ ショリ ノ エイキョウ

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In this first report about a series of studies of the cause for reversible deflection of turbine shafts and generator-rotor shafts appearing in heat-indication tests, the author examined the influences of heat treatment on the thermal expansion coefficient and carbides of 1%Cr-1%Mo-V steel which has been found more subjective to reversible bending than low alloy steels containing nickel. 1%Cr-1%Mo-V steel shows the second hardening at the tempered parameter of 17,500, accompanying the precipitation of VC and Mo2C; however, the structure of actual shaft forgings is quite stable because they are tempered at higher parameter than that of the second hardening. To study the relation between the change of carbides and heat treatment, electrolytic isolation, X-ray diffraction, extraction replica, electron diffraction of selected area and other means are used. As for the tested steel, M3C is formed chiefly in its tempered martensite and tempered bainite, and M23C6 in tempered pearlite. No change owing to tempering or re-heating for 100 hours at 650° or 700° was observed in these carbides. The thermal expansion coefficient of M3C and M23C6 are 12×10−6 and 20×10−6 (mean values from room temperature to 400°), respectively, which were calculated by means of high temperature X-ray diffraction patterns, using the method of least squares. The thermal expansion coefficient of 1%Cr-1%Mo-V steel was changed by heat treatment from 11.6×10−6 to 12.2×10−6 (mean values frqm 20° to 70°), but this difference cannot be referred to the difference of the carbides and the properties of the matrix should be taken into consideration accordingly.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 25 (2), 131-135, 1961

    公益社団法人 日本金属学会

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