Nano-investigation on Grain Boundary Periodic Alternating Segregation Based on Divorced Coincident Segregation Mechanism, Resulted in the Replacement of Conventional Site Competition in Steels
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概要
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The segregation mechanism of alloying elements in prior austenitic grain boundaries of embrittled 5% Ni steels has been investigated by AES in previous studies, while that of improved 5% Ni steels has not been clarified yet. In the present study, the segregating behavior of alloying elements in improved 5% Ni steels has been elucidated for the first time by applying FE-TEM with respect to the effects of soluble Al on the suppression of temper embrittlement and hydrogen embrittlement in the steels. <Br>It is consequently made clear by applying FE-TEM-EDS that alloying elements tend to segregate coincidently to grain boundaries, showing the asymmetric segregation according to solute interactions. The observed behavior is newly defined as the divorced coincident segregation, which is considered to result from the moderate site competitions in the deep potential well of McLeans equilibrium segregation. The divorced coincident segregation was investigated further along grain boundaries, where the periodic segregation of Al and Si was found to vary alternately along grain boundaries analyzed. The beneficial effect of soluble Al on the two types embrittlement is attributed to the mechanism of spot toughening through the periodic decrease of solutes in grain boundaries. The principle of the divorced coincident segregation proposed in 5% Ni steels can be applicable not only to ordinary steels but also to other poly-crystalline alloys in improving their properties.
- 社団法人 日本鉄鋼協会の論文
- 2000-08-15
著者
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Koseki Toshihiko
Oita R&d Laboratories Nippon Steel Corporation
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Mabuchi Hidesato
Oita R & D Laboratories Nippon Steel Corporation
関連論文
- Nano Investigation on the Grain Boundary Periodic Segregation Based on the Divorced Coincident Segregation in 5% Ni Steels
- The Segregating Behavior of Alloying Elements Based on the Divorced Coincident Segregation in 5% Ni Steels by the Application of FE-TEM
- Metallurgical Features of Steel Plates with Ultra Fine Grains in Surface Layers and their Formation Mechanism
- Nano-investigation on Grain Boundary Periodic Alternating Segregation Based on Divorced Coincident Segregation Mechanism, Resulted in the Replacement of Conventional Site Competition in Steels