New Improvements Using Super Thermal Field Y. Toda 1, R. Ozasa 2, T. 1 Center for Basic Research on Materials, National Institute for Materials Science (NIMS) 2 Graduate School of Engineering, Osaka University 3 Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency 4 Graduate School of Frontier Sciences, The University of Tokyo The poster will introduce the activities of "Science for Creation of Super-Titanium by Super-Thermal Field", which is one of the Planed Researches of "Creating Materials in Super-Thermal Fields: Neo-3D Printed by Manipulating Atomic Arrangements through Giant Potential Gradients (Director: Prof. Y. Koizumi at Osaka University)" accepted for a Grant-in-Aid for Transformative Research Areas (A) by the Ministry of Education, Culture, Sports, Science and Technology in FY2021. It is necessary to further expand the application temperature range of heat-resistant titanium alloys in order to improve the energy efficiencies of jet engines. However, the limits of microstructural control and improvement of high-temperature properties in these alloys by conventional forge and/or cast processing have been reached. This study will apply a steep temperature gradient and a fast-cooling rate in the super thermal field of additive manufacturing to retaining a supersaturated solid solution of β phase at room temperature and to controlling a crystal orientation of the β matrix and the precipitation of α phase. This trial will lead to a new microstructure and an improvement of high-temperature properties which has never been achieved before. Introduction of Millefeuillethrough Thermomechanical Treatment S. Emura Research Center for Structural Materials, National Institute for Materials Science (NIMS) To control the microstructure and to enhance the mechanical properties of titanium alloys, various types of thermomechanical treatment (combination of deformation (forging, rolling, etc.) and heat treatment) have been performed. For β titanium alloys, mainly consist of bcc β phase, α phase precipitation on deformed structure such as dislocation is favorable way to obtain fine and homogeneous microstructure, and many efforts have been done to optimize this thermomechanical treatment process. In this study, we use another thermomechanical treatment, α phase precipitation on {332}<113> deformed twins (typical twinning system in β titanium alloys), to realize millefeuille-like layered α/b structure in Ti-12 mass% Mo alloys. We performed slight cold rolling on β single phase Ti-12Mo plates followed by α precipitation aging treatment. During aging treatment, film-like α phases were precipitated and grew on the twin boundaries and finally made an alternately stacked α/b layered structure. Microstructure Design of Heat-resistant Titanium Alloys with Property Matsunaga 3, Y. Yamabe-Mitarai 4 and T. Nakano 2 -like αα/ββ Layered Structure into Ti-Mo AlloyPoster Presentation ｜NIMS Award Symposium 2023 P1 ｜ ProcessPP11--0011 PP11--0022 35
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