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Makoto Watanabe
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Numerical analysis of Al2O3 and TiO2 growth and oxygen dissolution in a metal substrate during the isothermal oxidation of an α-Ti alloy at 973 K
Description/Abstract:
Oxide growth and O dissolution during the oxidation of an α-Ti alloy at 973 K were simulated using the finite volume method coupled with ...
Keyword:
Kinetic modeling
,
Oxidation
,
Oxide growth
,
Oxygen dissolution
, and
Titanium alloy
Resource Type:
Article
Author:
Tomonori Kitashima
,
Takanobu Hiroto
, and
Makoto Watanabe
Journal:
Journal of Materials Research and Technology
Date Uploaded:
30/09/2024
Fabricating a single-crystal-like β grain structure of a near-β Ti alloy with unique variant selection by laser powder bed fusion
Description/Abstract:
A near-β Ti alloy with a highly anisotropic single-crystal-like β grain structure was fabricated on a polycrystalline pure-Ti substrate b...
Keyword:
Laser powder bed fusion
,
Precipitation
,
Texture
,
Titanium
, and
Variant selection
Resource Type:
Article
Author:
Tomonori Kitashima
,
Takanobu Hiroto
,
Dennis Edgard Jodi
, and
Makoto Watanabe
Journal:
Materials & Design
Date Uploaded:
30/09/2024
Significant creep-strength improvement in modified 9Cr-1Mo steel via microstructural control through laser powder bed fusion
Description/Abstract:
Modified 9Cr-1Mo steel was manufactured using laser powder bed fusion (LPBF). The as-built LPBF-sample microstructure comprised columnar ...
Keyword:
Creep
,
Ferritic steels
,
Laser powder bed fusion
,
Precipitation
, and
δ-ferrite
Resource Type:
Article
Author:
Tomotaka Hatakeyama
,
Kota Sawada
,
Masahiro Kusano
, and
Makoto Watanabe
Journal:
Additive Manufacturing
Date Uploaded:
26/09/2024
Development of Tungsten Repair Technology by Atmospheric Plasma Spraying of Tungsten and Friction Stir Processing
Description/Abstract:
Tungsten (W) has a high melting point, excellent thermal conductivity, and irradiation resistance, making it the most promising plasma fa...
Keyword:
atmospheric plasma spray process
,
divertor
,
friction stir processing
,
microstructure
,
nuclear fusion reactor
, and
tungsten
Resource Type:
Article
Author:
Phuangphaga Daram
,
Yoshiaki Morisada
,
Takuya Ogura
,
Masahiro Kusano
,
JuHyeon Yu
,
Makoto Fukuda
,
Hidetoshi Fujii
,
Seiji Kuroda
, and
Makoto Watanabe
Journal:
Journal of Thermal Spray Technology
Date Uploaded:
13/09/2024
Quantifying Laser Absorptivity of Ti–6Al–4V Powder through Additive Manufacturing Systems
Description/Abstract:
In laser metal-based powder-bed fusion additive manufacturing, it is important to know the laser absorptivity of metal powder to elucidat...
Keyword:
Ti-6Al-4V powder
,
additive manufacturing
,
laser absorptivity
, and
powder-bed fusion
Resource Type:
Article
Author:
Hiroshi Honda
and
Makoto Watanabe
Journal:
MATERIALS TRANSACTIONS
Date Uploaded:
02/09/2024
Microstructure and phase evolution of functionally graded multi-materials of Ni–Ti alloy fabricated by laser powder bed fusion process
Description/Abstract:
The layer-by-layer laser powder bed fusion (L-PBF) process was applied to fabricate functionally graded multi-materials (FGMs) of nickel-...
Keyword:
Compositional gradient
,
Functionally graded materials
,
Laser powder bed fusion process
,
Microstructure
, and
Ni-Ti alloy
Resource Type:
Article
Author:
Phuangphaga Daram
,
Takanobu Hiroto
, and
Makoto Watanabe
Journal:
Journal of Materials Research and Technology
Date Uploaded:
21/06/2024
Effects of time per layer and part geometry on thermal history and microcracking in the fabrication of nickel superalloy samples by laser powder bed fusion
Description/Abstract:
In this work, the purpose of the current study is to understand the effects of time per layer and part geometry on microcracking behavior...
Keyword:
Constricted geometry
,
Inconel 738 LC
,
Laser powder bed fusion
,
Microcracking
,
Thermal analysis
, and
Time per layer
Resource Type:
Article
Author:
Masahiro Kusano
,
Yusuke Takata
,
Atsushi Yumoto
, and
Makoto Watanabe
Journal:
Additive Manufacturing
Date Uploaded:
10/04/2024
Heat Source Model Development for Thermal Analysis of Laser Powder Bed Fusion Using Bayesian Optimization and Machine Learning
Description/Abstract:
To understand the correlation between process, structures, and properties in laser powder bed fusion (L-PBF), it is essential to use nume...
Keyword:
Bayesian optimization
,
Heat source model
,
Laser powder bed fusion
,
Laser scanning conditions
,
Multiple linear regression
, and
Thermal analysis
Resource Type:
Article
Author:
Masahiro Kusano
and
Makoto Watanabe
Journal:
Integrating Materials and Manufacturing Innovation
Date Uploaded:
09/04/2024
Particle Size Effect on Powder Packing Properties and Molten Pool Dimensions in Laser Powder Bed Fusion Simulation
Description/Abstract:
Various defects are produced during laser powder bed fusion (L-PBF) process, and can affect the quality of the fabricated part. Past stud...
Keyword:
discrete-element method
,
laser powder bed fusion
,
multiphysics CFD simulation
,
packing fraction
,
packing homogeneity
,
particle size
, and
powder spreading
Resource Type:
Article
Author:
Jun Katagiri
,
Sukeharu Nomoto
,
Masahiro Kusano
, and
Makoto Watanabe
Journal:
Journal of Manufacturing and Materials Processing
Date Uploaded:
05/04/2024
Solute segregation in a rapidly solidified Hastelloy-X Ni-based superalloy during laser powder bed fusion investigated by phase-field and computational thermal-fluid dynamics simulations
Description/Abstract:
Solute segregation significantly affects material properties and is a critical issue in the laser powder-bed fusion (LPBF) additive manuf...
Keyword:
Computational thermal-fluid dynamics simulation
,
Hastelloy-X nickel-based superalloy
,
Laser powder-bed fusion
,
Phase-field method
, and
Solute element segregation
Resource Type:
Article
Author:
Masayuki Okugawa
,
Kenji Saito
,
Haruki Yoshima
,
Katsuhiko Sawaizumi
,
Sukeharu Nomoto
,
Makoto Watanabe
,
Takayoshi Nakano
, and
Yuichiro Koizumi
Journal:
Additive Manufacturing
Date Uploaded:
02/04/2024
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7
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Makoto Watanabe
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Innovative Science and Technology Initiative for Security
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