フェライトステンレス鋼の時効脆化のアトムプローブによる検討(1) : Fe-28Cr-5Ni合金

概要

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A pulsed laser-atom probe has been used to investigate microstructural change and phase separations that occur during 475℃ embrittlement of ferritic stainless steel. In this study the Fe-28% Cr-5%Ni alloy was aged at 450℃ for as long as 5000h. In addition to the atom probe analysis, hardness, the fatigue crack propagation rate and Charpy V-notch impact-energy absorption were measured. We have found that the amplitude of the initial Cr concentration fluctuation increases with ageing up to 1035h and the alloy aged at 450℃ undergoes a spinodal decomposition. The size of Cr-rich precipitates increases with ageing time up to 5000h, while the wave length is saturated to 18〜32A^^○ at the ageing time of 1035h. The Cr-rich phase formed is considered as the major factor for the embrittlement.
一般社団法人日本機械学会の論文
1991-10-25