準安定オーステナイト域における塑性加工が13Cr鋼の耐食性におよぼす影響について

抄録

The corrosion resistance of 13% Cr stainless steel as deformed in the metastable austenite state prior to martensite transformation was qualitatively compared with that of the same steel as quenched conventionally. As corrosive environment, 40% HNO₃ in boiling state and 5% H₂SO₄ at room temperature were chosen.
It was observed that, compared with undeformed steel, deformed steel at 450°C did not show a poorer resistance to both acid solutions when steel was austenitized at 950°C or 1000°C.
However, the corrosion resistance of the steel became worse by deformation at 650°C, especially in 5% H₂SO₄. It seemed that this poorer corrosion resistance by deformation at 650°C was due to a heterogeneity of structure induced by the product of accelerated isothermal transformation.