Kyushu University Academic Staff Educational and Research Activities Database
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Tsuchiyama Toshihiro Last modified date:2018.04.06

Professor / Materials Processing Laboratories
Department of Materials Science and Engineering
Faculty of Engineering

Graduate School
Undergraduate School

Academic Degree
Dr. Eng.
Field of Specialization
Structural Materials
Outline Activities
(1) Fundamental research on strength, deformation, and fracture in steels
(2) Microstructure control of multi-phase steels
(3) Production and characterization of spcialty steels and titanium alloys
Research Interests
  • Mechanism of deformation and fracture in steel
    keyword : tensile test, yielding, work hardening, deformation structure, grain boundary
  • Basic research on strengthening mechanisms of steels
    keyword : grain refinement strengthening, particle dispersion strengthening (precipitation strengthening), dislocation strengthening (work hardening), solid solution strengthening
  • Alloy design and microstructure control of high-alloy steels
    keyword : austenitic stainless steel, ferritic stainless steel, martensitic stainless steel, high nitrogen steel, medium manganese dual-phase steel, high manganese austenitic steel
  • Fabrication of resource-saving type titanium alloy
    keyword : oxygen, nitrogen, grain refinement, thermomechanical processing, second phase dispersion
Academic Activities
1. Michiharu Asano, Takuro Masumura, Toshihiro Tsuchiyama, Setsuo Takaki, Jun Takahashi, Kosaku Ushioda, Quantitative evaluation of Cu particle dissolution in cold-worked ferritic iron, Scripta Materialia, 140, 18-22, 2017.05.
2. Toshihiro Tsuchiyama, Taishi Inoue, Junya Tobata, Akama Daichi, Setsuo Takaki, Microstructure and mechanical properties of a medium manganese steel treated with interrupted quenching and intercritical annealing, Scripta Materialia, 122, 36-39, 2016.10.
3. Akama Daichi, Toshihiro Tsuchiyama, Setsuo Takaki, Change in Dislocation Characteristics with Cold Working in Ultralow-carbon Martensitic Steel, ISIJ International, 56, 1675-1680, 2016.05.
4. Takuro Masumura, Nakada Nobuo, Toshihiro Tsuchiyama, Setsuo Takaki, Tamotsu Koyano, Kazuhiko Adachi, The difference in thermal and mechanical stabilities of austenite between carbon- and nitrogen-added metastable austenitic stainless steels, ACTA MATERIALIA, 10.1016/j.actamat.2014.10.041, 84, 330-338, 2015.02, In order to evaluate the effects of carbon and nitrogen addition on the stability of austenite, athermal and deformation-induced
a0-martensitic transformation behaviors were investigated using type 304-metastable austenitic stainless steels containing 0.1 mass% carbon or
nitrogen. The difference in the development of the deformation microstructure in particular is discussed in terms of the stacking-fault energy
(SFE). Since carbon-added steel has a lower SFE than that of nitrogen-added steel, deformation twins and e-martensite were preferentially formed
in the carbon-added steel, whereas a dislocation cell structure developed in the nitrogen-added steel. Crystallographic analysis using the electron
backscatter diffraction method revealed that the difference in the deformation microstructure has a significant influence on the growth behavior
of deformation-induced a0-martensite, that is, the interface of the deformation twins and e-martensite suppresses the growth of a0-martensite, whereas
dislocation cell boundaries are not effective. As a result, the mechanical stability of carbon-added steel is slightly higher than that of nitrogen-added
steel, although the thermal stabilization effect of carbon is much lower than that of nitrogen..
5. Toshihiro Tsuchiyama, Koichi Tsuboi, Shuichi Iwanaga, Takuro Masumura, MACADRE ARNAUD PAUL ALAIN, Nakada Nobuo, Setsuo Takaki, Suppression of hydrogen embrittlement by formation of a stable austenite layer in metastable austenitic stainless steel, SCRIPTA MATERIALIA, 10.1016/j.scriptamat.2014.07.005, 90-91, 14-16, 2014.11, Solution nitriding was applied to a metastable austenitic stainless steel plate (Fe–18Cr–8Ni alloy) to stabilize the austenite near
the plate surface. After cold rolling, the interior austenite almost entirely transformed to martensite, but the stabilized surface austenite
remained unchanged. The interior deformation-induced martensite contributes to the material’s high strength and the surface
stable austenite-layer plays an important role in preventing hydrogen permeation. As a result, the resistance to hydrogen embrittlement
was significantly improved for the cold-rolled specimen..
6. T. TSUCHIYAMA, J. TOBATA, T. TAO, N. NAKADA and S. TAKAKI, Quenching and Partitioning treatment of a low-carbon martensitic stainless steel, Materials Science and Engineering A, 532, pp. 585-592, 2012.01.
7. T. TSUCHIYAMA, T. ANDO and S. TAKAKI, Strengthening of Titanium Alloys by Interstitial Elements, Processing and Fabrication of Advanced Materials XVIII, pp. 777-786, 2009.12.
8. Y. TERAZAWA, T. ANDO, T. TSUCHIYAMA and S. TAKAKI, Relationship between Work Hardening Behavior and Deformation Structure in Ni-free High Nitrogen Austenitic Stainless Steels, steel research international, 80 (2009), pp. 473-476, 2009.07.
9. T. TSUCHIYAMA H. ITO K. KATAOKA and S. TAKAKI, Fabrication of Ultrahigh Nitrogen Austenitic Steels by Nitrogen Gas Absorption into Solid Solution, Metallurgical and Materials Transactions A, 10.1007/s11661-003-0018-z, 34A, 11, 2591-2599, Vol.34A No.11 pp.2591-2599, 2003.01.
10. T. TSUCHIYAMA H. UCHIDA K. KATAOKA and S. TAKAKI, Fabrication of Fine-Grained High Nitrogen Austenitic Steels through Mechanical Alloying Treatment, ISIJ International, 10.2355/isijinternational.42.1438, 42, 12, 1438-1443, Vol.42 No.12 pp.1438-1443, 2002.01.
11. Isothermal Transformation Behavior in 12%Cr-0.3%C Steel
Vol.87 1(2001)pp.49-54..
12. Isothermal Transformation Behavior in 12%Cr-0.3%C Steel with Partial Solution Treatment
Vol.87 9(2001)pp.613-618..
13. T. TSUCHIYAMA and S. TAKAKI, Recrystallization Mechanism of Lath Martensite in High Chromium Steel, Recrystallization and Grain Growth, 803-808, Vol.2 No. pp.803-808, 2001.01.
14. T. TSUCHIYAMA Y. MIYAMOTO and S. TAKAKI, Recrystallization of Lath Martensite with Bulge Nucleation and Growth Mechanism, ISIJ International, 10.2355/isijinternational.41.1047, 41, 9, 1047-1052, Vol.41 No.9 pp.1047-1052, 2001.01.
15. T. TSUCHIYAMA Y. ONO and S. TAKAKI, Microstructure Control for Toughening a High Carbon Martensitic Stainless Steel, ISIJ International (Supplement), Vol.40 No.0 pp.S184-S188, 2000.01.
16. T. TSUCHIYAMA and S. TAKAKI, Effect of Partial SolutionTreatment on Toughness of 12%Cr-0.3%C Steels, ISIJ International, 10.2355/isijinternational.39.202, 39, 2, 202-208, Vol.39 No.2 pp.202-208, 1999.01.
17. Austenite Grain Size Control by Insoluble Carbide in Martensitic Stainless Steels
Vol.81 2(1995)pp.147-152..
18. Effects of Insoluble Carbide on Microstructure and Hardness of Matensitic Stainless Steels
Vol.80 12(1994)pp.938-943..
1. Toshihiro Tsuchiyama, Michiharu Asano, Izumi Shimoji, Setsuo Takaki, Deformation and ductile fracture behaviors of a ferritic steel strengthened by Cu dispersion particles, PRICM9, 2016.08.