Work hardening, dislocation structure, and load partitioning in lath-martensite determined by ${it in situ}$ neutron diffraction line profile analysis
Harjo, S.; 川崎 卓郎; 友田 陽*; Gong, W.*; 相澤 一也; Tichy, G.*; Shi, Z.*; Ungar, T.*
Harjo, S.; Kawasaki, Takuro; Tomota, Yo*; Gong, W.*; Aizawa, Kazuya; Tichy, G.*; Shi, Z.*; Ungar, T.*
${it in situ}$ neutron diffraction during tensile deformation of lath martensite steel containing 0.22 mass% of carbon, is performed using TAKUMI of J-PARC. The diffraction peaks at plastically deformed states exhibit asymmetries as the reflection of redistributions of the stress and dislocation densities/arrangements in lath-packets where the dislocation glides are favorable (soft packet) and unfavorable (hard packet). The dislocation density is as high as 10$$^{15}$$ m$$^{-2}$$ at the as-quenched state, and then during tensile straining, the load and the dislocation density become different between the two lath-packets. The dislocation character and arrangement vary also in the hard packet, but hardly change in the soft packet. The hard packet plays an important role in the high work hardening in martensite, which could be understood by taking into account not only the increase of the dislocation density but also the change in dislocation arrangement.
使用言語 : English
掲載資料名 : Metallurgical and Materials Transactions A
: 48
: 9
ページ数 : p.4080 - 4092
発行年月 : 2017/09
出版社名 : Springer
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キーワード : no keyword
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登録番号 : AA20170020
抄録集掲載番号 : 45001222
論文投稿番号 : 19453
Accesses  (From Jun. 2, 2014)
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