日本金属学会誌

J. Japan Inst. Metals, Vol. 31, No. 7 (1967),
pp. 875-880

Structures of Internally Oxidized Dilute Nickel Alloys Containing Chronium

Shoji Goto1 and Shigeyasu Koda1

1The Research Institute for Iron Steel and Other Metals, Tohoku University, Sendai

Abstract:

Binary nickel alloys containing Cr up to 4 wt% as a solute element have been internally oxidized at temperatures between 900° and 1300°C to produce dispersed small Cr2O3 particles. The size and distribution of the dispersed particles and Vickers hardness of the internally oxidized layer have been determined. The results obtained are as follows. (1) The relationship between the depth of internally oxidized layer and the oxidation time of specimens followed a parabolic law. However, with increasing solute content and decreasing temperature, the internal oxidation due to grain boundary diffusion proceeded. (2) The size of dispersed particles in the internally oxidized layer became larger with the distance from the surface of the specimens. (3) The dispersed particles were rod-shaped crystalline Cr2O3, and in higher Cr content alloys, large lump shaped. (4) At a higher temperature of internal oxidation the size of dispesed particles became larger. With decreasing temperature and increasing solute content, the density of the dispersed particles was higher, and the Vickers hardness of the internally oxidized layer increased.


(Received 1967/2/15)

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