Farewell Party
A farewell party was held for laboratory members, and Haruta Sato, Yasuyuki Tanabe, and Tao Wu were sent off. We wish them all the best in their future endeavors.

TMS 2026
Associate Professor Satoru Kobayashi gave a presentation at the TMS 2026 Annual Meeting & Exhibition (San Diego) on decarburization behavior and creep deformation in Fe-Cr-Ni alloys under high-temperature hydrogen environments.
・Satoru Kobayashi, Effects of High Temperature Hydrogen on Microstructure and Creep Deformation in Fe-Cr-Ni Alloys

ISIJ Spring Meeting
Koki Saito gave an oral presentation at the ISIJ Spring Meeting.
・Koki Saito, Satoru Kobayashi: Evaluation of Hydrogen Effects on Creep Properties of SUS316L Using Hollow Specimens

Seminar
Prof. Hideki Murakami delivered a seminar. We had a very valuable opportunity to hear insightful talks, including during the subsequent social gathering.

JSPS R054 Committee
Yasuyuki Tanabe gave an oral presentation at a research meeting of the JSPS R054 Committee.
・田辺靖幸，小林覚，竹山雅夫：粒界析出強化型オーステナイト系耐熱鋼の室温力学特性に及ぼす組織因子の影響

Bachelor’s Thesis Presentation
Keigo Oda and Shun Matsuda gave oral presentations at the bachelor’s thesis presentation session.
・織田佳吾：Nb含有G相析出強化型オーステナイト系耐熱鋼のクリープ特性
・松田峻：Ni基耐熱合金における”-Ni3Ta析出物の熱的安定性に及ぼす合金元素の効果

Master’s Interim Presentation
Ziyi Wang and Aan Muhammad gave oral presentations at the master’s interim presentation session.
・Ziyi Wang: Comparison of Recrystallization Behavior of Austenitic Stainless Steels Aged in Hydrogen and Argon Atmospheres
・Aan Muhammad: Decarburization Behavior in Nickel-Based Alloys under High-Temperature Hydrogen Exposure

Master’s Thesis Presentation
Yota Sato, Yasuyuki Tanabe, and Tao Wu gave oral presentations at the master’s thesis presentation session.
・佐藤遥太：オーステナイト系耐熱鋼のクリープ速度に及ぼすG相粒界被覆率の影響
・田辺靖幸：Laves相強化型オーステナイト系耐熱鋼の室温力学特性に及ぼす組織因子の影響評価
・呉涛：オーステナイト系ステンレス鋼の高温水素脱炭挙動に及ぼす合金元素の影響

Institute Festival
We held research introductions, exhibitions, and hands-on activities at the institute festival.
Displays included jet engine components and microstructure images, along with arc melting demonstrations and a wire magic show.

IMPRES 2025
Associate Professor Satoru Kobayashi gave a presentation at the 7th International Symposium on Innovative Materials and Processes in Energy Systems (Sendai) on decarburization behavior in Fe-Cr-Ni alloys under high-temperature hydrogen environments.
・Satoru Kobayashi, Yuki Tsuda: “Microstructural Change in Fe-Cr-Ni Alloys by High-temperature Hydrogen Exposure”

Workshop
Associate Professor Satoru Kobayashi gave a lecture at a seminar on hydrogen combustion/co-firing and low-carbon power generation technologies.

Lab trip
We went to Nagatoro by lab trip.

Workshop Held
Associate Professor Satoru Kobayashi hosted the “Forum on Understanding Conventional and Emerging Issues in Heat-Resistant Steels and Alloys” at the Autumn Meeting of the Iron and Steel Institute of Japan (Sapporo).

Japan Society for Heat Treatment
Kazuma Mitsui (M1) gave an oral presentation with the following title at the conference of the Japan Society for Heat Treatment and received the Excellent Presentation Award.
Ni基耐熱合金Ta-718のγ (A1)/γ"(D0 22 )二相組織の安定性に及ぼすTaのV置換の影響

Research Meeting
Associate Professor Satoru Kobayashi organized a research session on "Reliability Assessment of Heat-Resistant Metallic Materials for the 2050 Energy Transformation" at the Japan Institute of Metals and Materials Conference.

Japan Society for the Promotion of Science
Taisei Kasuga (M2) and Shuhei Nishida (M2) gave oral presentations at the JSPS R054 Committee Research Meeting.

EPRI 2025
Associate Professor Satoru Kobayashi gave a lecture on the creep deformation of Ni-based heat-resistant alloys at the 10th International Conference on Advances in Materials, Manufacturing & Repair for Power Plants.

Doctoral Dissertation Public Hearing
Yotaro Okada gave a presentation at his doctoral dissertation public hearing with the following title:
Mechanical Properties of Microstructure Constituents and Microstructure Design in TiAl Base Alloys:  Role of β-Ti Phase and Effect of Oxygen

University Festival
We exhibited jet engine components and introduced our research at the university festival.

Laboratory Trip
From September 26-27, 2024, we went on a laboratory trip to Nasu Highlands. Activities included climbing Mount Chausu, having a BBQ, and exploring Minamigaoka Farm.

Autumn Conference
The following presentations were given at the Japan Institute of Metals and Materials Conference or the Japan Steel Institute Conference (Osaka University):
・Shuhei Nishida (M2), Satoru Kobayashi  "Effect of Ta Substitution for V on Microstructure Formation in Ta-718 Alloy"
・Haruta Sato (M1), Satoru Kobayashi, Tomoaki Hamaguchi, Nao Otaki,  "Effect of Alloying Elements on Phase Equilibria Between γ/G Phases in Austenitic Heat-Resistant Steels"

Spring Conference
The following presentations were given at the Japan Institute of Metals and Materials Conference or the Japan Steel Institute Conference (Tokyo University of Science):
・Taisei Kasuga (M1), Hirotoyo Nakashima, Satoru Kobayashi  "Phase Equilibria Between γ/G Phases in Ni-Si-X (X: Zr, Ti, Nb, Ta, W, Mo) Ternary System"
・Haruta Sato (B4), Hirotoyo Nakashima, Satoru Kobayashi  "Effect of Alloying Elements on Phase Equilibria Between γ/G Phases in Austenitic Heat-Resistant Steels"
・Boxuan Li (M2), Zhetao Yuan, Hirotoyo Nakashima, Satoru Kobayashi, Masao Takeyama
    "Effects of Grain Size and Grain Boundary Precipitates on Room Temperature Tensile Properties of Fe-Cr-Ni-Nb Based Heat-Resistant Austenitic Steels"
・Hirotoyo Nakashima, Eiji Tada, Satoru Kobayashi  "Effect of Solute Oxygen on Phase Equilibria in Ti-Al-Ni Ternary System"

Japan Society for the Promotion of Science
The following presentations were given at the JSPS R054 Research Committee Meeting (Tohoku University):
・Yuki Tsuda (M2), Satoru Kobayashi  "Microstructural Changes in Fe-Ni-Cr Alloys Due to High-Temperature Hydrogen Gas Exposure"
・Ryuichi Isomura (M2), Ryousuke Yamagata, Hirotoyo Nakashima, Satoru Kobayashi, Masao Takeyama  "Effects of Temperature and Atmosphere on Fatigue Crack Growth Behavior in TiAl Alloys"
・Hirotoyo Nakashima, Eiji Tada, Satoru Kobayashi  "Joining of TiAl Alloys Using Electrolytic Ni Plating Film"

Laboratory Trip
From September 28-29, 2023, we went on a laboratory trip to Nikko and Kinugawa. Activities included visiting Toshogu Shrine, having a BBQ, and rafting.

Autumn Conference
The following presentations were given at the 186th Japan Steel Institute Conference and the 173rd Japan Institute of Metals and Materials Conference (University of Toyama):
・Yuki Tsuda (M2) "Microstructural Changes in Fe-Ni-Based Alloys Due to High-Temperature Hydrogen Exposure"
・Shuhei Nishida (M1) "Effects of Alloying Elements on the Stability of γ-Ni(A1)/γ''-Ni₃Ta(D0₂₂) Two-Phase Microstructure"
・Satoru Kobayashi "Effects of Alloying Elements on Invar Effect in Fe-Ni-Co System and Proposal for Low Thermal Expansion Heat-Resistant Materials"
・Hirotoyo Nakashima "Phase Equilibria Among β/α/γ/τ3 Phases in the Ti-Al-Nb-Ni Quaternary System"
・Ruona Tang (M1) "Effect of Oxygen on Phase Equilibria Between α-Ti/α₂-Ti₃Al Phases"

IWTA2023
The following presentations were given at the 7th International Workshop on Titanium Aluminides held in Toulouse from June 11-16, 2023:
・Hirotoyo Nakashima "Computational Alloy Design of TiAl Alloys Applicable to Powder Processes"
・Ruona Tang (M1) "Phase Equilibria Between α-Ti/ α₂-Ti₃ Phases near 1473 K in TiAl Alloys Containing Oxygen"