二相ステンレス鋳鋼の時効脆化のアトムプローブによる研究

概要

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Nanometer-scale microstructural change that occurs during thermal aging of the ferritic phase of duplex stainless steel was analyzed with a pulsed-laser-atom probe. In addition, changes in electrochemical behavior and the magnetic hysteresis loop were examined and an attempt was made to correlate them to the microstructural change. In this study Fe-19% Cr-10% Ni-2% Mo cast duplexstainless steel was aged at 475℃ for 443h. Important conclusions are as follows. (1) Aging promotes the phase separation of the steel into a Cr-rich region (α') and a Fe-rich region, which form a possible 3D modulated structure with a wavelength on the 10 nm order. (2) The electrochemical reactivation peak in the aged steel may result from the Fe-rich region with Cr concentration below 14 at%. (3) The nanometer-scale microstructural change causes hardening and increases hysteresis loss.
一般社団法人日本機械学会の論文
1993-05-25