高温における12Cr-1Mo-1W-1/4V鋼の応力緩和特性について

概要

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The present work has dealt with the stress relaxation characteristics of 12Cr-1 Mo-1 W-1/4V steel which is used for high temperature equipments. The effect of initial stress on the stress relaxation properties of this steel was studied at 550℃ by means of "Step-Down flow Rate" test in which the conventional lever type creep testing machines were used. Stress relaxation tests were also processed at several temperatures with constant stress initially applied, by the use of the specially designed stress relaxation testing machines which automatically kept the total extension of the test specimens constant. the magnitude of stress by which the residual stress of the test specimens was reduced with time manually (in "Step-Down" test) or automatically (in automatic type "Relaxation" testing machine), was 1.27 kg/mm^2 respectively. the test temperature was maintained constant to ±0.5 deg. C at each of the tests and 0.05kg/mm^2. continued to the period of about 1 500 hours. Microstructure change of this steel after long term test procedure was observed with optical and electron-microscopic method.
社団法人日本材料学会の論文
1964-03-15