中, 低炭素鋼の焼戻し過程における χ-炭化物析出

概要

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Observations by transmission electron microscopy have been made on some quenched and tempered carbon steels containing 0.017%, 0.15%, and 0.48% carbon, to clarify the precipitation of χ-carbide in lower carbon steels, which was clearly found during tempering of some high carbon steel by the present authors. The main results obtained are summarized as follows : (1) There exists χ-carbide in the tempering processes of low (0.017%, 0.15%C) and medium (0.48%C) carbon steels. (2) The habit plane of the χ-carbide in the medium carbon steel is {112}_α, suggesting that the carbide may precipitate preferentially on martensite twin boundaries. (3) The orientation relationship of the χ-carbide with ferrite matrix of low and medium carbon steels is approximately expressed as (100)_χ//1^^-2^^-1)_α, (010)_χ//(101)_α, and [001]_χ//[1^^-11]_α.
社団法人日本鉄鋼協会の論文
1973-02-01