Papers by Author: Koichi Tsuchiya

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Authors: Koichi Tsuchiya, O. Kawabata, Minoru Umemoto, H. Sato, K. Marukawa
469
Authors: Minoru Umemoto, Zhi Guang Liu, K. Masuyama, Koichi Tsuchiya
93
Authors: Minoru Umemoto, Zhi Guang Liu, D.Y. Liu, H. Takaoka, Koichi Tsuchiya
199
Authors: Minoru Umemoto, Yoshikazu Todaka, T. Takahashi, P. Li, R. Tokumiya, Koichi Tsuchiya
607
Authors: L. Diaz Barriga Arceo, J.J. Cruz-Rivera, J. Gerardo Cabañas-Moreno, Koichi Tsuchiya, Minoru Umemoto, H.A. Calderón
641
Authors: O. Coreño Alonso, J. Gerardo Cabañas-Moreno, J.J. Cruz-Rivera, H.A. Calderón, Minoru Umemoto, Koichi Tsuchiya, S. Quintana-Molina, C. Falcony
635
Authors: Minoru Umemoto, Yoshikazu Todaka, Tadashi Yasuda, Koichi Tsuchiya
193
Authors: Minoru Umemoto, Yoshikazu Todaka, Yukinori Watanabe, Jin Guo Li, Koichi Tsuchiya
571
Authors: Minoru Umemoto, Yoshikazu Todaka, Akifumi Ohno, Mayumi Suzuki, Koichi Tsuchiya
157
Authors: Minoru Umemoto, Yoshikazu Todaka, Akifumi Ohno, Mayumi Suzuki, Koichi Tsuchiya
Abstract: Dissolution behavior of cementite in eutectoid steels with pearlitic and spheroidite structures by severe plastic deformation was studied. Applying a long time milling, cementite dissolved completely and matrix turned out to be nanocrystalline ferrite. By a ball drop deformation (at high strain rates), heavily deformed layers in which cementite dissolves completely or partially were produced. By applying pulsed laser irradiation, re-austenitized zone which transformed to fresh martensite during quenching was produced. The boundary between the re-austenitized zone and matrix exhibited similar microstructure with that observed in specimens subjected to a ball drop deformation. It was suggested that the dissolution of cementite by heavy deformation at high strain rates are probably due to thermal effect, that is, re-austenitization.
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