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Miyamoto Lab
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The lab controls the microstructure of steel to create materials that are strong and hard to break.
AboutAbout the lab
Defects inside metal determine how strong a material is.
The Miyamoto Lab aims to develop materials with outstanding properties by controlling the microstructure of structural metallic materials, including steel.
Structural metallic materials must resist deformation so they can support heavy loads, resist fracture, and be easy to form into complex shapes.
These properties are governed by grain boundaries, second phases, and other defects within the metal crystal, collectively known as the microstructure.
Using advanced analytical methods, the lab clarifies how microstructures form through both experiments and theory, and then controls them by optimizing thermomechanical processing and alloying elements.
Key terms
- Microstructure
- The state of defects within a metal crystal, such as grain boundaries and second phases, which determines the properties of the material
- Phase transformation
- A phenomenon in which a material changes, with its chemical composition unchanged, to a state (phase) with a different atomic arrangement
- Thermomechanical processing
- Adjusting the microstructure of a metal by combining mechanical working, which applies force, with heat treatment, which involves heating and cooling
NewsLab news
The Miyamoto Lab was established
Associate Professor Zhang, Professor Miyamoto, and colleagues received the Sawamura Paper Award from the Iron and Steel Institute of Japan
A master's student received the Research Presentation Encouragement Award (Best Award) at a meeting of the Japan Society for Heat Treatment
A master's student received the Excellence Award and Encouragement Award in the poster session of the 190th Autumn Meeting of the Iron and Steel Institute of Japan
Professor Miyamoto and colleagues received the Academic Paper Award at the 99th Meeting of the Japan Society for Heat Treatment
ResearchResearch themes
The high strength, high toughness, and high ductility required of structural metallic materials are governed by the microstructure, including grain boundaries and second phases. Using advanced analytical methods, the lab clarifies how microstructures form through both experiments and theory, and aims to develop materials with outstanding properties by optimizing thermomechanical processing and alloying elements.
*Illustrative imageStrengthening automotive steel with nano-sized carbides
To improve crash safety, achieve better fuel economy, and reduce resource use, there is a strong demand for higher-strength steel, which makes up most of a car body. The lab quantitatively investigates the precipitate microstructure and mechanical properties of steels in which nanometer-sized carbides are dispersed, using electron microscopy and 3D atom probe analysis.
*Illustrative imageSurface hardening with nanoclusters
In machine parts such as gears and crankshafts, load and wear are concentrated at the surface. Focusing on nitriding, a treatment that hardens the surface while preserving the shape of the part, the lab has found that the hardening comes from the formation of extremely fine nanoclusters.
*Illustrative imageControlling phase transformation microstructures in steel
More refined methods of microstructure control are needed, such as making transformation microstructures even finer and stabilizing the parent phase through element partitioning during phase transformation. The lab quantitatively clarifies the crystallographic constraints on nucleation and the element partitioning at interfaces, and aims to establish guiding principles for controlling them.
*Illustrative imageReconstructing the microstructure before transformation
The microstructure of steel is produced by making use of the transformation that occurs when austenite, which is stable at high temperature, cools down. The lab has independently developed a method to reconstruct the austenite microstructure, which does not remain at room temperature, from the crystal orientations (EBSD) of the microstructure after transformation.
MembersFaculty
The members of the Miyamoto Lab include faculty, research fellows, secretaries and research support staff, technical assistants, doctoral and master's students, and special research students.As of 2026
- ProfessorGoro Miyamoto
- Associate ProfessorYongjie Zhang
- Assistant ProfessorYulin Xie
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Steel truss bridge over Fiskelva river in Nordreisa, Troms og Finnmark, Norway, 2022 August” Ximonic (Simo Räsänen) / CC BY-SA 4.0 (cropped)
- Strengthening automotive steel with nano-sized carbides: “Continuous ten-stand strip mill - Trumbull Steel” "New Continuous Ten-Stand Strip Mill", The Iron Age, June 1, 1922, p. 1510 / Public domain (cropped)
- Surface hardening with nanoclusters: “20180114 Zahnrad Kohlenwäsche, Zeche Zollverein, Essen (DSC01966)” Günter Seggebäing, Coesfeld / CC BY-SA 3.0 (cropped)
- Controlling phase transformation microstructures in steel: “Steel 035 water quenched” Unbound at English Wikipedia / Public domain (cropped)
- Reconstructing the microstructure before transformation: “EBSD orientation map of ferrous lath martensite” Tiberio / CC BY-SA 4.0 (cropped)
- Related lab (Suto-Ando Lab): “Tellurium crystals” Hi-Res Images of Chemical Elements / CC BY 3.0 (cropped)
- Related lab (Sato-Suzuki Lab): “Bulkhead & Nosecone Of Orion Spacecraft Joined By Friction Stir Welding” NASA / Public domain (cropped)
- Related lab (Oikawa Lab): “Huta Pokój walcownia 2019 (4)” Adrian Tync / CC BY-SA 4.0 (cropped)
- Related lab (Kameoka Lab): “Catalytic converter 20230510” Santeri Viinamäki / CC BY-SA 4.0 (cropped)
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