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Creep-fatigue assessment of martensitic welds based on numerically determined local deformation

  • Thorben Bender

    Thorben Bender works at the Materials Testing Institute (MPA) University of Stuttgart as a research assistant in the department “Materials Behavior and Materials Modelling”. After receiving his diploma degree in Civil Engineering from the Karlsruhe Institute of Technology in 2015, he started to work as a research assistant at the Institute of Forming Technology and Lightweight Components of the University of Dortmund and joined the Materials Testing Institute (MPA) in 2017.

     EMAIL logo     , Andreas Klenk

    Dr. Andreas Klenk has been Deputy Director of the Materials Testing Institute since 2014 and Head of Materials Behavior Department since 2003. He obtained his diploma in Mechanical Engineering in 1985 and received his doctorate on the Assessment of cracks in dynamically loaded structures from the University of Stuttgart in 1995. After being Teaching Assistant at the Chair of Materials Testing, Materials Technology, and Strength Design 1985–1992 he was working as Head of Specialist Group Dynamic Testing at MPA Stuttgart, was Visiting Associate Professor at the University of Tokyo, School of Engineering from 1995 to 1996 and further on Deputy Head of High Temperature Materials Department of MPA Stuttgart. He specialised on the characterization of short and long term behavior of materials and weldments, numerical simulation and development of constitutive equations for high temperature applications, and design and lifetime assessment of power plant components.

         and Stefan Weihe

    Prof. Dr. Stefan Weihe is managing Director of the Materials Testing Institute (MPA) University of Stuttgart as well as Head and Full Professor of the Institute of Materials Testing, Materials Science and Strength of Materials (IMWF) of the University of Stuttgart, Germany, since 2014. He received his doctorate in Aerospace Engineering at the Institute for Statics and Dynamics of Aerospace Structures, University of Stuttgart in 1998 and afterwards began working as a Senior Expert for Chassis Strength, Friction and Wear for Audi AG, Ingolstadt, Germany. From 2002 to 2014, he was a Senior Manager in the field of Strength and Fatigue, Body in White, and Body Concepts and Advanced Engineering in the Development and Research Department, Division Mercedes-Benz Vans, Daimler AG, Stuttgart, Germany.
Published/Copyright: May 24, 2023
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Materials Testing
From the journal Materials Testing Volume 65 Issue 6

Abstract

The low cycle fatigue and creep-fatigue behavior of base material and similar welded joints of martensitic steel Grade 92 were examined in this work. Several low cycle fatigue tests with different loading scenarios: fatigue tests with strain-controlled hold time, fatigue tests with strain-controlled amplitudes, and load-controlled hold times, were performed at 873 K. The tests were evaluated with regard to fatigue lifetime, peak stress, the evolution of relaxation stress or creep strain, and failure location. The effect of amplitude level, hold time modus and hold time length on the lifetime of the specimens was investigated using lifetime and damage assessment methods based on strain energy approaches. The numerical simulations for the determination of the evolution of local strains and stresses were done using a viscoplastic material model of Chaboche type, including a strain energy based damage formulation. For the parameter identification, tests were carried out on the specimens made of base metal, welded joint, weld metal, and with microstructure simulated specimens aiming to obtain representative microstructures of the fine grain, intercritical, and coarse grain heat affected zone. The numerical assessment of the local stress, strain, and damage distribution explains the smaller lifetime of the welded joint specimens.

Keywords: creep-fatigue; finite element method; heat affected zone; P92; welded joint
Corresponding author: Thorben Bender, Materialprüfungsanstalt (MPA), Universität Stuttgart, Abteilung Werkstoffverhalten und Werkstoffmodellierung, Referat Hochtemperaturwerkstoffprüfung, Pfaffenwaldring 32, D-70569 Stuttgart, Germany, E-mail:

About the authors

Thorben Bender

Thorben Bender works at the Materials Testing Institute (MPA) University of Stuttgart as a research assistant in the department “Materials Behavior and Materials Modelling”. After receiving his diploma degree in Civil Engineering from the Karlsruhe Institute of Technology in 2015, he started to work as a research assistant at the Institute of Forming Technology and Lightweight Components of the University of Dortmund and joined the Materials Testing Institute (MPA) in 2017.

Andreas Klenk

Dr. Andreas Klenk has been Deputy Director of the Materials Testing Institute since 2014 and Head of Materials Behavior Department since 2003. He obtained his diploma in Mechanical Engineering in 1985 and received his doctorate on the Assessment of cracks in dynamically loaded structures from the University of Stuttgart in 1995. After being Teaching Assistant at the Chair of Materials Testing, Materials Technology, and Strength Design 1985–1992 he was working as Head of Specialist Group Dynamic Testing at MPA Stuttgart, was Visiting Associate Professor at the University of Tokyo, School of Engineering from 1995 to 1996 and further on Deputy Head of High Temperature Materials Department of MPA Stuttgart. He specialised on the characterization of short and long term behavior of materials and weldments, numerical simulation and development of constitutive equations for high temperature applications, and design and lifetime assessment of power plant components.

Stefan Weihe

Prof. Dr. Stefan Weihe is managing Director of the Materials Testing Institute (MPA) University of Stuttgart as well as Head and Full Professor of the Institute of Materials Testing, Materials Science and Strength of Materials (IMWF) of the University of Stuttgart, Germany, since 2014. He received his doctorate in Aerospace Engineering at the Institute for Statics and Dynamics of Aerospace Structures, University of Stuttgart in 1998 and afterwards began working as a Senior Expert for Chassis Strength, Friction and Wear for Audi AG, Ingolstadt, Germany. From 2002 to 2014, he was a Senior Manager in the field of Strength and Fatigue, Body in White, and Body Concepts and Advanced Engineering in the Development and Research Department, Division Mercedes-Benz Vans, Daimler AG, Stuttgart, Germany.

Acknowledgments

The authors acknowledge the financial support from the Federal Ministry for Economy and Energy and from the partners in the project VGB Calculation Methods.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Published Online: 2023-05-24
Published in Print: 2023-06-27

© 2023 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. Creep-fatigue assessment of martensitic welds based on numerically determined local deformation
  3. Evaluation of ductile fracture criteria in combination with a homogenous polynomial yield function for edge splitting damage of DP steels
  4. Microscopic characteristics of copper wires with short-circuit molten marks in electrical fire
  5. Microstructure and properties of laser cladding in-situ ceramic particles reinforced Ni-based coatings
  6. Wear properties of borided WC-Co
  7. Microstructure and mechanical properties of an additively manufactured AlSi10Mg based alloy
  8. Finite element method analysis of a linear friction welded Ti6Al4V alloy
  9. Influence of partitioning treatment on microstructure and mechanical properties of an alloyed ductile iron austempered at different temperatures
  10. Process parameters, structure and mechanical properties of dissimilar Nimonic 80 A/AISI 316 L resistance welded joints
  11. Atmospheric corrosion behaviors of 6000-series aluminum alloy under tropical climate influences of Thailand
  12. Effect of micro particle addition to the resin on the mechanical behavior of fiber reinforced composite plates
  13. Ecofriendly synthesis of hydrated manganese oxide and its efficient adsorption of lead ions from water
  14. TIG-weldability of AISI 430 and DUROSTAT 500 grade
  15. Mechanical behavior of AA5083/AA6061 friction stir welds using modal analysis
https://doi.org/10.1515/mt-2022-0397
Keywords for this article
creep-fatigue; finite element method; heat affected zone; P92; welded joint

Articles in the same Issue

  1. Frontmatter
  2. Creep-fatigue assessment of martensitic welds based on numerically determined local deformation
  3. Evaluation of ductile fracture criteria in combination with a homogenous polynomial yield function for edge splitting damage of DP steels
  4. Microscopic characteristics of copper wires with short-circuit molten marks in electrical fire
  5. Microstructure and properties of laser cladding in-situ ceramic particles reinforced Ni-based coatings
  6. Wear properties of borided WC-Co
  7. Microstructure and mechanical properties of an additively manufactured AlSi10Mg based alloy
  8. Finite element method analysis of a linear friction welded Ti6Al4V alloy
  9. Influence of partitioning treatment on microstructure and mechanical properties of an alloyed ductile iron austempered at different temperatures
  10. Process parameters, structure and mechanical properties of dissimilar Nimonic 80 A/AISI 316 L resistance welded joints
  11. Atmospheric corrosion behaviors of 6000-series aluminum alloy under tropical climate influences of Thailand
  12. Effect of micro particle addition to the resin on the mechanical behavior of fiber reinforced composite plates
  13. Ecofriendly synthesis of hydrated manganese oxide and its efficient adsorption of lead ions from water
  14. TIG-weldability of AISI 430 and DUROSTAT 500 grade
  15. Mechanical behavior of AA5083/AA6061 friction stir welds using modal analysis
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