高炭素鋼の焼戻し過程におけるχ-炭化物析出

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In order to make clear the precipitation behaviour of iron-carbides, especially the existence or non existence of χ-carbide, in the tempering process of steels, observations were made of some quenched and tempered high carbon steels containing 0.86∿1.34 wt pct carbon by transmission electron microscopy. Thermomagnetic and thermal dilatational measurements were also made for comparison's sake. The main results obtained are summarized as follows : (1) In the high carbon steels tempered under appropriate conditions, χ-carbide can be observed by transmission electron microscope. (2) Habit plane of χ-carbide is determined to be {112}_α suggesting that the carbide may precipitate preferentially on martensite twin boundary. (3) In electron micrographs, morphology and growth direction of χ-carbide are different from those of ε-carbide, but are very similar to those of θ-carbide which precipitates on {112}_α. From these observations, separate nucleation and in situ transformation are supposed for ε→χ and χ→θ transition, respectively. θ-carbide precipitating on {110}_α is also found, and is suggested to take place by separate nucleation directly from ε-carbide. (4) Using three main crystal indices of planes and direction in χ-carbide, i. e., (100)_χ, (010)_χ, and [001]_χ, the orientation relationship of the carbide with ferrite matrix is approximately expressed as (100)_χ≈⫽(1^^-2^^-1)_α, (010)_χ≈⫽(101)_α, and [001]_χ≈⫽[1^^-11]_α. (5) By thermomagnetic and thermal dilatational measurements, the precipitation of χ-carbide is also detected on the high carbon steels tempered under the most favourable condition to obtain χ-carbide.
社団法人日本鉄鋼協会の論文
1972-05-01

高炭素鋼の焼戻し過程におけるχ-炭化物析出

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