Elucidation of Fatigue Fracture Min M Elucidation of Fatigue Fracture MH. Oguma1 in M1 Research Center for Structural Materials, National Institute for Materials Science (NIMS) H. Oguma1 The use of high-strength materials, such as high-strength steels, titanium alloys, and fiber-reinforced 1 Research Center for Structural Materials, National Institute for Materials Science (NIMS) plastics, is increasing in harsh environments as transportation equipment becomes faster, lighter, and more efficient. The study of fatigue fracture mechanisms has primarily focused on the impact of The use of high-strength materials, such as high-strength steels, titanium alloys, and fiber-reinforced environmental conditions on cracks and material interfaces. The presentation summarizes ongoing plastics, is increasing in harsh environments as transportation equipment becomes faster, lighter, and research activities that aim to clarify fatigue features in real service conditions and use the ambient more efficient. The study of fatigue fracture mechanisms has primarily focused on the impact of environment to explain fracture mechanisms and the dominant factors affecting strength properties. environmental conditions on cracks and material interfaces. The presentation summarizes ongoing Systematic experimental data accumulation is being carried out, especially with regards to long-term research activities that aim to clarify fatigue features in real service conditions and use the ambient reliability, to develop material and structural design methods. These efforts aim to facilitate the prompt environment to explain fracture mechanisms and the dominant factors affecting strength properties. implementation and utilization of innovative materials with high reliability under extreme Systematic experimental data accumulation is being carried out, especially with regards to long-term environmental conditions. reliability, to develop material and structural design methods. These efforts aim to facilitate the prompt implementation and utilization of innovative materials with high reliability under extreme environmental conditions. PP33--1144 Beneficial Aspect of Hydrogen on the M Yuhei Ogawa 1 Beneficial Aspect of Hydrogen on the M1 Research Center for Structural Materials, National Institute for Materials Science (NIMS) Yuhei Ogawa 1 Hydrogen gas is an energy carrier attracting great attention toward realizing a carbon-neutral society. 1 Research Center for Structural Materials, National Institute for Materials Science (NIMS) However, a critical problem in the robust design of structural metals for hydrogen gas-related devices is the degradation of strength and ductility caused by the dissolution of H atoms, i.e., hydrogen Hydrogen gas is an energy carrier attracting great attention toward realizing a carbon-neutral society. embrittlement (HE). Nevertheless, while the negative aspect stands out, H can also beneficially impact However, a critical problem in the robust design of structural metals for hydrogen gas-related devices is the mechanical properties of metals. An example is the increase in yield stress associated with hydrogen the degradation of strength and ductility caused by the dissolution of H atoms, i.e., hydrogen occlusion, i.e., solid-solution hardening; besides, notable improvement in the fracture elongation by embrittlement (HE). Nevertheless, while the negative aspect stands out, H can also beneficially impact solute hydrogen has sometimes been confirmed in stable austenitic alloys. the mechanical properties of metals. An example is the increase in yield stress associated with hydrogen Note that any property changes in metals due to the presence of foreign elements are not limited to occlusion, i.e., solid-solution hardening; besides, notable improvement in the fracture elongation by the case of hydrogen. Depending on the loading conditions and service environment, these changes solute hydrogen has sometimes been confirmed in stable austenitic alloys. potentially turn into either positive or negative. In this regard, HE can be viewed as a phenomenon in Note that any property changes in metals due to the presence of foreign elements are not limited to which only the negative aspects of hydrogen have been taken into account. If one can extract only the the case of hydrogen. Depending on the loading conditions and service environment, these changes positive effects while suppressing all the embrittlement factors, it would be the strategy to develop potentially turn into either positive or negative. In this regard, HE can be viewed as a phenomenon in innovative materials that could solve the long-standing HE problems in hydrogen-related industries. which only the negative aspects of hydrogen have been taken into account. If one can extract only the identified that solute hydrogen significantly improves the strength-ductility balance of positive effects while suppressing all the embrittlement factors, it would be the strategy to develop some conventional Fe-Cr-Ni austenitic steels, wherein the above two notable outcomes: solid-solution innovative materials that could solve the long-standing HE problems in hydrogen-related industries. hardening; enhanced elongation, simultaneously manifested. This newly discovered role of solute H will identified that solute hydrogen significantly improves the strength-ductility balance of be reviewed, outlining central perspectives and phenomenological understanding. some conventional Fe-Cr-Ni austenitic steels, wherein the above two notable outcomes: solid-solution hardening; enhanced elongation, simultaneously manifested. This newly discovered role of solute H will be reviewed, outlining central perspectives and phenomenological understanding. 64PP33--1133 PP33--1133 aterials aterials PP33--1144 We recentlyWe recentlyPoster Presentation ｜NIMS Award Symposium 2023echanism Focusing on the Environment and Interface echanism Focusing on the Environment and Interface echanical Property of Fe-Cr-Ni Austenitic Steels echanical Property of Fe-Cr-Ni Austenitic Steels P3 ｜ Evaluation
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