Influence of pre-deformation on fatigue life of high strength steels by means of micromagnetic Barkhausen noise

Yashar Sarafraz; Malte Brink; Nikolas Baak; Alexander Koch; Frank Walther

doi:10.1515/mt-2022-0425

Artikel

Influence of pre-deformation on fatigue life of high strength steels by means of micromagnetic Barkhausen noise

Yashar Sarafraz, born in 1985, studied Mechanical Engineering with specialization in Manufacturing Technology and Materials Testing at TU Dortmund University, Germany. After his master thesis, he has been working as a scientific assistant at the Chair of Materials Test Engineering (WPT) of TU Dortmund University. His research focus is on fatigue and fracture of metals.
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Malte Brink, born in 1994, studies Mechanical Engineering with specialization in Materials Technology and Testing at TU Dortmund University, Germany. He has been working as a Student Assistant at the Chair of Materials Test Engineering (WPT) of TU Dortmund University.
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Nikolas Baak, born in 1988, studied Mechanical Engineering with specialization in Materials Engineering at Ruhr University Bochum, Germany. After his master thesis, he has been working as a graduate assistant at the Department of Materials Testing (WP). Since July 2016, he is working as a Scientific Assistant in the Chair of Materials Test Engineering (WPT) and heads the group of steels since 2020. His research focuses on fatigue and fracture of steels and the nondestructive evaluation by means of micromagnetic techniques.
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Alexander Koch, born in 1992, studied Mechanical Engineering with specialization in Materials Testing at TU Dortmund University, Germany. After his master thesis, he has been working as a Scientific Assistant at the Chair of Materials Test Engineering (WPT) of TU Dortmund University. Since 2022, he has been Senior Engineer at WPT. His research focus is on fatigue and fracture of light metals.
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Frank Walther, born in 1970, studied Mechanical Engineering majoring in Materials Science and Engineering at TU Kaiserslautern University, Germany, where he completed his PhD on the fatigue assessment of railway wheel steels in 2002 and his habilitation on the metrological acquisition of microstructure- and fatigue evolution of metals in 2007. From 2008 to 2010 he was member within Corporate Innovation and Knowledge Management and Corporate Engineering at Schaeffler Technologies in Herzogenaurach, Germany, and since 2010 he has been Professor for Materials Test Engineering (WPT) at TU Dortmund University, Germany. His main research focuses on the microstructure-based characterization and modeling of fatigue behavior depending on production and service, aiming at a comprehensive process–structure–property understanding, ORCID 0000-0003-2287-2099. Prof. Walther maintains close scientific contact with institutions and industries worldwide.

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Abstract

The micromagnetic Barkhausen noise as a nondestructive testing method was employed in this work to analyze the fatigue behavior of high-strength steels by subjecting them to multi-stage load increase fatigue tests. The micromagnetic Barkhausen noise energy (MBN_Energy) was measured during fatigue tests and coupled with digital image correlation to evaluate the effect of static and cyclic stress as well as local surface strain on MBN_Energy. The test samples were prepared from the forged bainite 18MnCrMoV6 and two ferrite-pearlite 38MnVS6 and 46MnVS5 steels. A part of the specimens was pre-strained before cyclic loading to analyze the effect of pre-deformation on cyclic strength considering measured MBN_Energy. A significant increase in MBN_Energy was observed by increasing the cyclic load on 18MnCrMoV6 specimens with bainite phases while this increase of MBN_Energy was not significant or was not changed for ferrite-pearlite steels 38MnVS6 and 46MnVS5.

Keywords: Barkhausen noise; high-strength steels; load increase fatigue tests; micromagnetic testing method; nondestructive testing

Corresponding author: Yashar Sarafraz, Chair of Materials Test Engineering, TU Dortmund University, Baroper Str. 303, Dortmund D - 44227, Germany, E-mail: yashar.sarafraz@tu-dortmund.de

Funding source: Forschungsvereinigung Stahlanwendung

Award Identifier / Grant number: IGF 20559 N/P 1361

About the authors

Yashar Sarafraz

Yashar Sarafraz, born in 1985, studied Mechanical Engineering with specialization in Manufacturing Technology and Materials Testing at TU Dortmund University, Germany. After his master thesis, he has been working as a scientific assistant at the Chair of Materials Test Engineering (WPT) of TU Dortmund University. His research focus is on fatigue and fracture of metals.

Malte Brink

Malte Brink, born in 1994, studies Mechanical Engineering with specialization in Materials Technology and Testing at TU Dortmund University, Germany. He has been working as a Student Assistant at the Chair of Materials Test Engineering (WPT) of TU Dortmund University.

Nikolas Baak

Nikolas Baak, born in 1988, studied Mechanical Engineering with specialization in Materials Engineering at Ruhr University Bochum, Germany. After his master thesis, he has been working as a graduate assistant at the Department of Materials Testing (WP). Since July 2016, he is working as a Scientific Assistant in the Chair of Materials Test Engineering (WPT) and heads the group of steels since 2020. His research focuses on fatigue and fracture of steels and the nondestructive evaluation by means of micromagnetic techniques.

Alexander Koch

Alexander Koch, born in 1992, studied Mechanical Engineering with specialization in Materials Testing at TU Dortmund University, Germany. After his master thesis, he has been working as a Scientific Assistant at the Chair of Materials Test Engineering (WPT) of TU Dortmund University. Since 2022, he has been Senior Engineer at WPT. His research focus is on fatigue and fracture of light metals.

Frank Walther

Frank Walther, born in 1970, studied Mechanical Engineering majoring in Materials Science and Engineering at TU Kaiserslautern University, Germany, where he completed his PhD on the fatigue assessment of railway wheel steels in 2002 and his habilitation on the metrological acquisition of microstructure- and fatigue evolution of metals in 2007. From 2008 to 2010 he was member within Corporate Innovation and Knowledge Management and Corporate Engineering at Schaeffler Technologies in Herzogenaurach, Germany, and since 2010 he has been Professor for Materials Test Engineering (WPT) at TU Dortmund University, Germany. His main research focuses on the microstructure-based characterization and modeling of fatigue behavior depending on production and service, aiming at a comprehensive process–structure–property understanding, ORCID 0000-0003-2287-2099. Prof. Walther maintains close scientific contact with institutions and industries worldwide.

Acknowledgements

Further thanks go to our project partner, Academic and Research Department for Integrity of Materials and Structures, headed by Prof. Muenstermann, from RWTH Aachen University for excellent collaboration, and the members of the project monitoring committee for providing materials and project support.

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: The research project IGF 20559 N / P 1361 “Quantitative evaluation and efficient characterization of intrinsic and extrinsic influences on cyclic properties of high-strength steels” from the Research Association for Steel Application (FOSTA), Duesseldorf, was supported by the Federal Ministry of Economic Affairs and Climate Action through the German Federation of Industrial Research Associations (AiF) as part of the program for promoting industrial cooperative research (IGF) on the basis of a decision by the German Bundestag.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Published Online: 2023-04-21

Published in Print: 2023-05-25

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https://doi.org/10.1515/mt-2022-0425

Schlagwörter für diesen Artikel

Barkhausen noise; high-strength steels; load increase fatigue tests; micromagnetic testing method; nondestructive testing