著者

加藤 雅治

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.47, no.5, pp.256-261, 2008-05-01 (Released:2011-08-11)

参考文献数

7

被引用文献数

1

著者

和田 竜二 小林 法子 藤居 俊之 尾中 晋 加藤 雅治

出版者

The Japan Institute of Metals

雑誌

日本金屬學會誌 (ISSN:00214876)

巻号頁・発行日

vol.71, no.8, pp.587-591, 2007

被引用文献数

2

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Elastic interaction energy between two super-circular inclusions with purely dilatational misfit strains is evaluated. For the calculation, a two dimensional model is used together with linear elasticity for the cubic anisotropy of copper. When two inclusions lie parallel to <100> of the copper crystal, attractive interaction is observed between the inclusions. The maximum of the attractive interaction is realized when the two inclusions exist close to each other. As the inclusion shape becomes circular to square-like, the maximum interaction energy decreases and the distance between the two inclusions to give the maximum increases. Furthermore, the two inclusions are found to be most stable when they have the same size. In addition to the elastic interaction energy, interface energy of the matrix/inclusion interface is also considered. The results show that the two inclusions tend to become the same size even for a situation when the interface energy is much more dominant compared with the elastic interaction energy.<br>

著者

加藤 雅治

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.47, no.6, pp.317-322, 2008-06-01 (Released:2011-08-11)

参考文献数

4

被引用文献数

6 5

著者

雨宮 雄太郎 中田 伸生 諸岡 聡 小坂 誠 加藤 雅治

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.105, no.2, pp.314-323, 2019 (Released:2019-01-31)

参考文献数

28

被引用文献数

5

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For deeper understanding of a dynamic accommodation mechanism of internal stress in pearlite originated from the lattice misfit between ferrite and cementite phases, the lattice parameter ratios of cementite, bθ/aθ and cθ/aθ, were locally analyzed in detail by using the electron backscatter diffraction (EBSD) technique. The EBSD analysis has revealed that lattice parameter ratios of cementite lamellae obviously differ from those of spheroidized cementite particles, which demonstrates that pearlite has a certain amount of internal stress as long as it maintains lamellar structure. The internal stress in pearlite gradually decreased during isothermal holding at 923 K after pearlitic transformation due to interfacial atomic diffusion of iron atoms. However, comparing with theoretical values under Pitsch-Petch orientation relationship, it was understood that large amount of internal stress had been already accommodated upon pearlitic transformation by introduction of misfit dislocations and structural ledges on ferrite/cementite lamellar interfaces. That is, the internal stress of pearlite is dynamically reduced by two different processes; built-in accommodation upon pearlitic transformation and additional time-dependent relaxation after pearlitic transformation. On the other hand, EBSD analysis and neutron diffraction technique gave remarkably different lattice parameters of cementite. From this result, it is concluded that various crystallographic orientation relationships between ferrite and cementite coexist in pearlite. Furthermore, elastic strain energy analysis suggests that the invariant-line criterion on ferrite/cementite interface plays an important role for the selection of orientation relationships in pearlite.