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Quantitative evaluation of texture and dislocations during annealing after hot deformation in austenitic steel using neutron diffraction

中性子回折によるオーステナイト鋼高温変形後焼鈍中の集合組織と転位密度の定量評価

友田 陽*; 佐藤 成男*; Uchida, M.*; 徐 平光 ; Harjo, S.; Gong, W.; 川崎 卓郎

Tomota, Yo*; Sato, Shigeo*; Uchida, M.*; Xu, P. G.; Harjo, S.; Gong, W.; Kawasaki, Takuro

Microstructural change during hot compressive deformation at 700 $$^{circ}$$C followed by isothermal annealing for a Fe-32Ni austnitic alloy was monitored using ${it in situ}$ neutron diffraction. The evolution of deformation texture with 40% compression and its change to recrystallization texture during isothermal annealing were presented by inverse pole figures for the axial and radial directions. The change in dislocation density was tracked using the convolutional muli-profile whole profile fitting method. To obtain the fitting results with good statistics, at least 60 s time-slicing for the event-mode recorded data was needed. The average dislocation density in 60 s after hot compression was determined to be 2.8 $$times$$ 10$$^{14}$$ m$$^{-2}$$ that decreased with increasing of annealing time.

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