ニッケル・クロム鋼の變態速度に就て
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概要
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The transformation velocity of steel changes according to its composition and maximum heating temperature. The present work was undertaken to determine the transformation velocities of 27 nickel-chromium steels containing different quantity of nickel, chromium and carbon by dilatometric measurement, since the velocity is of practical importance in the heat treatment of steel. Each specimen was cooled with different velocities, and the relation between the cooling velocity and the amounts of the normal (Ar′) and lowered (Ar″) transformations was plotted, from which the critical cooling velocity, i.e. the minimum velocity which the Ar′ transformation to be completed, or the Ar″ transformation begins to appear as the cooling rate further increases, was determined. It is found that as the maximum heating temperature rises, the transformation velocity of the Ar′ change is delayed, and as the carbon content increases up to a certain amount (0.2∿0.3%) the velocity of the Ar′ change is delayed and then hastened with further addition of carbon, and also that as the nickel or chromium content increases the transformation velocity is retarded ; the effect is larger by chromium than by nickel. In series of specimens with 1.7%Ni, 0.85%Cr and 3.2%Ni, 0.85%Cr (with both different in carbon content) the transformation velocity is fairly rapid, while in those with. 4.7%Ni, 1.7%Cr the velocity is very slow, requiring 4∿8 hours in cooling through the range 700 to 500℃ from 850℃ for completion of the Ar′ change. The microstructure of specimens used in the dilatometric measurement was also examined, and the relation between the structure and the transformation point in the dilatometric cooling curve was clarifieed.
- 社団法人日本鉄鋼協会の論文
- 1938-06-25
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