Nano Investigation on the Grain Boundary Periodic Segregation Based on the Divorced Coincident Segregation in 5% Ni Steels

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概要

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• The segregation mechanism of alloying elements in prior austenitic grain boundaries in the improved 5 % Ni steels with no or almost no intergranular fracture was studied for the first time by applying FE-TEM in the previous study. It has been consequently elucidated that alloying elements tend to segregate coincidently to grain boundaries, showing the asymmetric segregation according to solute interactions. The observed behavior was defined as the "divorced coincident segregation" in the previous paper. The result also shows the effect of soluble Al on the suppression of temper embrittlement and hydrogen embrittlement. In the present study, the mechanism of the divorced coincident segregation is further investigated by employing FE-TEM-EDS along grain boundaries. First is found the periodic segregation of Al and Si, which vary alternately by the cycle of about 3 nm along grain boundaries investigated. It is also shown that Al has the repulsive interaction with Si both in grain boundaries and in matrices.

• 社団法人 日本鉄鋼協会の論文

著者

• Koseki T

  Department Of Materials Engineering The University Of Tokyo

• Koseki Toshihiko

  Oita R&d Laboratories Nippon Steel Corporation

• Uemori Ryuji

  Steel Research Laboratories Nippon Steel Corporation

• MABUCHI Hidesato

  Department of R&D, The Japan Research and Development Center for Metals

• Mabuchi Hidesato

  Department Of R&d The Japan Research And Development Center For Metals

関連論文

• Effects of Boron, Niobium and Titanium on Grain Growth in Ultra High Purity 18% Cr Ferritic Stainless Steel
• Effect of Phosphorous on Surface Hot Shortness due to Cu in 0.1%C Steel
• The Role of Mn Depletion in Intra-Granular Ferrite Transformation in the Heat Affected Zone of Welded Joints with Large Heat Input in Structural Steels
• Nano Investigation on the Grain Boundary Periodic Segregation Based on the Divorced Coincident Segregation in 5% Ni Steels
• 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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