経年模擬ステンレス鋼の機械的特性評価 : 第2報,アトムプローブによるステンレス鋼の時効組織の検出

概要

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Microstructural changes in the ferritic phase of ferritic and ferritic/austenitic duplex stainless steels during aging have been examined using the atom probe and the position-sensitive atom probe. These provide a means for atomic-scale microstructural and microchemical analysis, and allow the composition variations in the sample to be reconstructed in 3-D with subnanometer resolution. With the progress of aging, the ferritic phase undergoes phase decomposition via the spinodal mechanism, and the initial fluctuation in Cr concentration develops, resulting in the precipitation of Cr-rich particles with modulated three-dimensional interconnected structure. The hardening may be attributed to the spinodal decomposition, that is, the lattice misfit effect, resulting in increase in fluctuation of Cr concentration and Cr-rich particle precipitation in the modulated structure. An increase in hardness is closely related to the volume fraction of Cr-rich particles.
一般社団法人日本機械学会の論文
1993-09-25