準安定オーステナイト系ステンレス鋼のα'→γ逆変態に及ぼす炭素の影響

概要

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The effects of carbon on reversion behavior of metastable austenitic stainless steel were investigated using a 16.2%Cr-8.8%Ni-0.11%C steel by means of transmission electron microscopy and magnetic analysis. The steel used almost transforms to lath martensite (α') from austenite (γ) by 90% cold rolling. The results are as follows : (1) The steel completely reverses on 923 K-10 s annealing. However, isothermal α' is produced on subsequent aging at room temperature (290 K) in case of more than 0.1 ks in 923 K isothermal annealing, and also at 900 K and above in 0.6 ks isochronal annealing. (2) In case of 923 K annealing, carbide precipitation occurred in preference to reversion. The carbide tends to retard a martensitic reversion and accelerate a diffusional reversion inversely. (3) The grain size of γ reversed by a diffusional reversion at 923 K annealing is 0.2μm dia. The carbide is very effective for refining grain by reversion.
社団法人日本鉄鋼協会の論文
1989-07-01