Fe-Mo-C合金の焼き戻し2次硬化ピーク段階における極微小析出物のAP-FIMによる解析
1991 年 55 巻 2 号 p. 141-150
詳細
1991 年 55 巻 2 号 p. 141-150
Morphology and chemical compositions of the precipitates formed at the peak stage of secondary hardening in an Fe-Mo-C alloy were examined by atom probe field ion microscopy (AP-FIM). The present AP-FIM analysis has confirmed the existence of not only needle-like Mo2C precipitates along the ⟨100⟩α−Fe directions but also plate-like precipitates lying parallel to the {100}α−Fe planes at the peak stage of secondary hardening. The latter were deduced to be clusters of Mo and a small fraction of Fe atoms that contain neither C nor N. These Mo-rich clusters are finer and more densely distributed than Mo2C. Thus, its presence may significantly contribute to the secondary hardening of Mo steels.
