MIYANO Yasuyuki

写真a

Affiliation

Graduate School of Engineering Science  Department of Systems Design Engineering  Mechanical Engineering Course 

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Research Interests 【 display / non-display 】

  • 鉄鋼材料を対象とした摩擦攪拌接合

  • 微生物腐食の機構解明・抑止技術開発

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Graduating School 【 display / non-display 】

  • 1995.04
    -
    1999.03

    Akita University   Faculty of Mining   Graduated

  • 1991.04
    -
    1995.03

    Chuo University   Faculty of Law   Graduated

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Graduate School 【 display / non-display 】

  • 2001.04
    -
    2004.03

    Osaka University  Graduate School,Division of Engineering  Division of Manufacturing Science  Doctor's Course  Completed

  • 1999.04
    -
    2001.03

    Akita University  Graduate School, Division of Mining  Doctor's Course  Completed

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Campus Career 【 display / non-display 】

  • 2016.04
    -
    Now

    Akita University   Graduate School of Engineering Science   Department of Systems Design Engineering   Mechanical Engineering Course   Associate Professor  

  • 2012.10
    -
    2016.03

    Akita University   Graduate School of Engineering and Resource Science   Department of Mechanical Engineering   Associate Professor  

  • 2010.04
    -
    2012.09

    Akita University   Faculty of Education and Human Studies   Program in Environmental and Mathematical Science   Associate Professor  

  • 2007.10
    -
    2010.03

    Akita University   Faculty of Education and Human Studies   Program in Environmental and Mathematical Science   Lecturer  

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Research Achievements 【 display / non-display 】

    ◆Original paper【 display / non-display 】

  • Integrated Understanding of Initial MIC Behavior in Welded Stainless Steels: Focusing on the Interrelationship Between Electrochemical Potential and Microbial Localization

    Miyano Yasuyuki, Wakai Satoshi, Sunaba Toshiyuki, Mizukami Hirotaka, Tokita Shun, Obana Nozomu, Nomura Nobuhiko

    Tetsu-to-Hagane ( The Iron and Steel Institute of Japan )  advpub ( 0 )   2025.12  [Refereed]

    Research paper (journal)   Domestic Co-author

    <p>Microbiologically influenced corrosion (MIC) is increasingly recognized as a key factor affecting the reliability of welded stainless steel structures. Recent studies highlight early-stage MIC under service-like conditions, emphasizing electrochemical–microbial interactions.</p><p>Laboratory tests using natural freshwater from industrial facilities have revealed corrosion risks in sensitized austenitic stainless steels such as SUS304. In these materials, the open circuit potential (OCP) often shows time-dependent ennoblement that begins earlier and reaches higher values than in non-sensitized base metal. This behavior is linked to microstructural degradation, notably chromium depletion at grain boundaries, and may contribute to the higher MIC susceptibility of sensitized regions.</p><p>Long-term exposure studies across stainless steel grades demonstrate that corrosion morphology-ranging from general to localized or negligible-varies with chromium content and correlates with distinct microbial communities. These findings suggest that microbial populations adaptively localize in response to electrochemical heterogeneity, promoting corrosion initiation and progression.</p><p>To probe this effect, weld-like model systems simulating the interface structure between sensitized and non-sensitized stainless steel regions were tested in a three-electrode setup under controlled micro-scale potential gradients. Electrochemical measurements combined with microbial community profiling indicated functional differentiation between anodic and cathodic areas, with certain taxa preferentially colonizing cathodic sites, suggesting the functional localization of microbial activity driven by electrochemical heterogeneity.</p><p>Overall, these studies highlight the complex interactions among microstructure, electrochemistry, and microbial distribution in MIC initiation. Such integrated insights provide a basis for improved diagnosis and mitigation strategies of MIC in welded stainless steel structures under realistic environmental conditions.</p>

    DOI CiNii Research

  • Case Study and Factor Analysis of Early Localized Corrosion in SUS304 Siphon Pipes of Agricultural Water Facilities —An Engineering Reassessment Based on Field Investigation Records—

    Miyano Yasuyuki, Murai Nobuaki

    Tetsu-to-Hagane ( The Iron and Steel Institute of Japan )  advpub ( 0 )   2025.10  [Refereed]

    Research paper (journal)   Domestic Co-author

    <p>This technical report presents an engineering analysis of an early case of localized corrosion in SUS304 stainless steel siphon pipes used in an agricultural water facility in Akita Prefecture, Japan. Within only a few years after installation, significant wall thinning and perforation were observed, particularly around welded regions, even though stainless steels are generally expected to provide high resistance under neutral freshwater conditions. Radiographic testing (RT) confirmed corrosion shadows and uneven thinning, and the estimated corrosion rate was several times higher than typical values reported for stainless steels in similar environments. Detailed evaluation based on inspection records, design specifications, and operating history suggests that multiple factors overlapped to accelerate the damage. Multiple overlapping factors are considered responsible, including weld-zone sensitization and stagnant/empty-pipe oxygen limitation with possible local chloride build-up. In this context, MIC is treated as a plausible, yet unproven, contributory factor. In this context, microbiologically influenced corrosion (MIC) is treated as a plausible, yet unproven, contributory factor rather than a sole cause. This case highlights that even highly corrosion-resistant alloys may fail to deliver expected performance if site-specific conditions are overlooked. The findings provide important lessons for material selection, corrosion protection, and maintenance strategies in irrigation facilities where stainless steels are widely adopted with expectations of long-term durability.</p>

    DOI CiNii Research

  • Friction Stir Welding of 1.4 GPa-Grade Tempered Martensitic Steel

    Miyano Yasuyuki, Washiya Hiroki, Sato Hiromu, Aoki Yasuhiro, Kimura Mitsuhiko, Ushioda Kohsaku, Fujii Hidetoshi

    ISIJ International ( 一般社団法人 日本鉄鋼協会 )  64 ( 12 ) 1795 - 1803   2024.10  [Refereed]

    Research paper (journal)   Domestic Co-author

    <p>Thermal hysteresis in fusion welding causes significant weld deterioration in medium- and high-carbon steels. Therefore, the development of an effective alternative welding process is required. Friction stir welding (FSW) is a solid-state welding process performed in an atmosphere that reduces the risks associated with melting and solidification of metals, making it an effective alternative method. Furthermore, it facilitates a flexible in-process control of heat input, which can be achieved by controlling the welding parameters. Considering these, the authors conducted a series of studies to elucidate the characteristics of FSW for medium- and high-carbon steels, including high-strength tempered steels.</p><p>This paper presents the results of applying FSW to 1.4 GPa-grade tempered JIS-S55C steel plates. Five distinct weld types were created by varying the welding parameters, including tool rotation and welding speed. The temperature of the interface between the tool and in-process material was measured using a thermal imaging camera. The microstructure of the welds was evaluated using optical microscopy and field-emission scanning electron microscopy (FE-SEM) with an electron-backscatter diffraction (EBSD) measurement system. The mechanical properties of the welds were evaluated through Vickers hardness and tensile tests. Digital image correlation analysis was employed to analyze the local deformation during the tensile test.</p>

    DOI CiNii Research

  • Comparative Analysis of Aerobic vs. Anaerobic Environments on Microbiologically Influenced Corrosion in Industrial Water

    Satoshi Wakai, Hirotaka Mizukami, Toshiyuki Sunaba, Yasuyuki Miyano

    Corrosion     2026.01  [Refereed]

    Research paper (journal)   Domestic Co-author

    DOI

  • Corrosion Behavior and Action on Microbes of Copper in a Freshwater Microbiologically Influenced Corrosion Risk Environment

    Yasuyuki Miyano, Satoshi Wakai, Kazuhiko Miyanaga, Toshiyuki Sunaba, Hirotaka Mizukami, Nanami Eno

    Materials Transactions ( 日本金属学会 )  64 ( 1 ) 280 - 286   2023.01

    Research paper (journal)   Domestic Co-author

    • display all >>

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    ◆Introduction and explanation【 display / non-display 】

  • Integrated Understanding of Initial MIC Behavior in Welded Stainless Steels: Focusing on the Interrelationship Between Electrochemical Potential and Microbial Localization

        2025.07

    Introduction and explanation (bulletin of university, research institution)   Single author

  • Integrated Understanding of Initial MIC Behavior in Welded Stainless Steels: Focusing on the Interrelationship Between Electrochemical Potential and Microbial Localization

        2025.07

    Introduction and explanation (bulletin of university, research institution)   Single author

  • Integrated Understanding of Initial MIC Behavior in Welded Stainless Steels: Focusing on the Interrelationship Between Electrochemical Potential and Microbial Localization

        2025.07

    Introduction and explanation (bulletin of university, research institution)   Single author

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    ◆International conference proceedings【 display / non-display 】

  • Effect of potential ennoblement on the formation of microbiome on stainless steel surfaces

    Yasuyuki Miyano, Kotaro Tai, shunn Tokita, Toshiyuki Sunaba, Hirotaka Mizukami, Satoshi Wakai

    Proceedings of Australasian Corrosion Association Conference 2023     2023.11  [Refereed]

    Research paper (international conference proceedings)   Domestic Co-author

  • Electrochemical Behaviour and Microbial Interactions of AISI 304 Stainless Steels with Different Microstructures Under Artificially Induced Ennoblement in Freshwater

    Yasuyuki Miyano, Shun Tokita, Toshiyuki Sunaba, Hirotaka Mizukami, Satoshi Wakai,

    Corrosion & Prevention 2025; Doc Number ACA0025-010     2025.11  [Refereed]

    Research paper (international conference proceedings)   Domestic Co-author

  • Comparative Analysis Of Aerobic/Anaerobic Environments On Microbiologically Influenced Corrosion In Industrial Water

    Satoshi Wakai, Hirotaka Mizukami, Toshiyuki Sunaba, Yasuyuki Miyano

    Corrosion & Prevention 2024; Doc Number ACA2024-21614     2024.11  [Refereed]

    Research paper (international conference proceedings)   Domestic Co-author

  • Case Study On Microbiologically Induced Corrosion In Industrial Water and Immersion Tests

    Satoshi Wakai, Hirotaka Mizukami, Toshiyuki Sunaba, Yasuyuki Miyano

    Corrosion & Prevention 2024; Doc Number ACA2024-21612     2024.11  [Refereed]

    Research paper (international conference proceedings)   Domestic Co-author

  • Corrosion And Microbiome Analysis Of Galvanic Connected Type 304 Stainless Steel With Dissimilar Microstructures Pair in Freshwater

    Yasuyuki Miyano, Satoshi Wakai, Shun Tokita, Hirotaka Mizukami, Ayano Yasui, Takehiro Toyoda, Toshiyuki Sunaba

    Corrosion & Prevention 2024; Doc Number ACA2024-21608     2024.11  [Refereed]

    Research paper (international conference proceedings)   Domestic Co-author

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    ◆University bulletin, Research institution【 display / non-display 】

  • Biomachining of Stainless Steel Using Bacteria

    Yasuyuki Miyano, Takeshi Tsubonuma, K.R. Sreekumari, Akira Omori, Yasushi Kikuchi

    TRANSACTIONS OF JWRI   32 ( 1 ) 239 - 242   2003.09

    Research paper (university bulletin, research institution)   Domestic Co-author

  • Fundamental Studies on Biomachining of Carbon steel

    Yasuyuki Miyano, Osamu Kamiya, Lotfi Chouanine, Yasushi Kikuchi

    TRANSACTIONS OF JWRI   31 ( 2 ) 239 - 242   2003.09

    Research paper (university bulletin, research institution)   Single author

  • Case Study on Microbiologically Influenced Corrosion of SUS316L Welds

    Yasuyuki Miyano, Michiyoshi Yamamoto, Kazuya Watanabe, Yasushi Kikuchi

    TRANSACTIONS OF JWRI   31 ( 2 ) 213 - 217   2003.02

    Research paper (university bulletin, research institution)   Domestic Co-author

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    ◆Research society, Symposium materials, etc.【 display / non-display 】

  • Microstructure and antibacterial property of dissimilar overlay welds of Cu alloy on stainless steel

    KADOI Kota, MIYANO Yasuyuki, KAWABAATA Shunta, KOYOTA Souichi, INOUE Hiroshige

    Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY )  2022f ( 0 ) 214 - 215   2022

    Research paper (research society, symposium materials, etc.)  

    DOI CiNii Research

  • Effect of chromium depletion layer at grain boundary on microbiologically influenced corrosion sensitivity of the heat affected zone in SUS304 steel

    Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY )  2020 ( 0 ) 88 - 89   2020

    Research paper (research society, symposium materials, etc.)   Domestic Co-author

    DOI CiNii Research

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Books 【 display / non-display 】

  • Electron-Based Bioscience and Biotechnology

    Masaharu Ishii, Satoshi Wakai, Yasuyuki MIyano

    Springer  2020.09 ISBN: 978-981-15-4763-8

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Grant-in-Aid for Scientific Research 【 display / non-display 】

  • Grant-in-Aid for Scientific Research(B)

    Project Year： 2023.04  -  2026.03 

  • Grant-in-Aid for Scientific Research(B)

    Project Year： 2020.04  -  2023.03 

  • Grant-in-Aid for Scientific Research(C)

    Project Year： 2016.04  -  2019.03 

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Acceptance of contract business 【 display / non-display 】

  • Contract period： 2023.04.01  -  2024.03.31

  • Contract period： 2022.04.01  -  2023.03.31

  • Contract period： 2021.04.01  -  2022.03.31

  • Contract period： 2020.04.01  -  2021.03.31

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Presentations 【 display / non-display 】

  • Simultaneous 4D Imaging of Metal Surfaces and Microbial Biofilms for Corrosion Risk Assessment in Buffer Material Environments

    Nozomu Obana, Yu Manabe, Yasuyuki Miyano, Nobuhiko Nomura

    Corrosion & Prevention 2025  2025.11  -  2025.11 

  • Corrosion and Microbiome Analysis of Galvanic Connected Type 304 Stainless Steel with Dissimilar Microstructures Pair in Freshwater

    Yasuyuki Miyano, Satoshi Wakai, Shun Tokita, Hirotaka Mizukami, Ayano Yasui, Takehiro Toyoda, Toshiyuki Sunaba.

    Corrosion & Prevention 2025  2025.11  -  2025.11 

  • Electrochemical Behavior and Corrosion Morphology of a Sensitized Austenitic Stainless Steel Working Electrode in a Same-steel Configuration Electrochemical Cell in Unsterilized Industrial Water

    Yasuyuki Miyano, Toshiyuki Sunaba, Toa Shiozawa Hirotaka Mizukami, Shun Tokita, Satoshi Wakai

    EUROCORR2025  2025.09  -  2025.09 

  • Case study of MIC on Stainless Steel in Industrial Water Environment

    宮野泰征，塩澤冬愛，鴇田駿，砂場敏行，水上裕貴，若井暁

    EUROCORR2025  2025.09  -  2025.09 

  • Prediction of Microbial Functions by Single Cell Genome Analysis for Microorganisms in Corrosion Products

    Satoshi Wakai, Hirotaka Mizukami, Ayano Yasui, Toshiyuki Sunaba, YAsuyuki Miyano

    EUROCORR2025  2025.09  -  2025.09 

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Academic Activity 【 display / non-display 】

  • 2025.03
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    2026.02

  • 2024.03
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    2026.03

  • 2026.01
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    Now

  • 2025.07
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    Now

  • 2025.12
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    2026.03

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