Influence of uniaxial and biaxial pre-straining on the high cycle fatigue performance of DP590 steel
TL;DR: In this paper, the authors assess tensile and high cycle fatigue performance of dual-phase (DP590) steel subjected to uniaxial and equi-biaxial pre-strain.
About: This article is published in International Journal of Fatigue.The article was published on 2021-08-01. It has received 15 citations till now. The article focuses on the topics: Fatigue limit & Ultimate tensile strength.
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01 Feb 2005
TL;DR: A method for the visualization of plastic deformation in electron back-scattered diffraction (EBSD) data has been developed and is described in this article based on mapping the intragrain misorientation in polycrystalline metals.
Abstract: The ability to map plastic deformation around high strain gradient microstructural features is central in studying phenomena such as fatigue and stress corrosion cracking. A method for the visualization of plastic deformation in electron back-scattered diffraction (EBSD) data has been developed and is described in this article. This technique is based on mapping the intragrain misorientation in polycrystalline metals. The algorithm maps the scalar misorientation between a local minimum misorientation reference pixel and every other pixel within an individual grain. A map around the corner of a Vickers indentation in 304 stainless steel was used as a test case. Several algorithms for EBSD mapping were then applied to the deformation distributions around air fatigue and stress corrosion cracks in 304 stainless steel. Using this technique, clear visualization of a deformation zone around high strain gradient microstructural features (crack tips, indentations, etc.) is possible with standard EBSD data.
115 citations
TL;DR: In this article , the impact of tensile pre-straining on the performance of automotive grade dual-phase steels was investigated, and the most significant improvement in HCF life and deterioration in LCF life were observed for equi-biaxial and orthogonal tensile pretraining conditions due to the rotation of maximum shear stress plane and the deformation concentrated region around the hard martensite.
Abstract: In many engineering structural applications, including car body structures, sheet metal formed components are used. A systematic investigation of the impact of forming strain on fatigue life is necessary for an accurate prediction of a formed component's fatigue life. The present work aims to determine the impact of diverse types of tensile pre-straining on high cycle fatigue (HCF), low cycle fatigue (LCF) and notch fatigue performance of automotive grade dual phase steels. In all examined pre-straining conditions, HCF life improves, LCF life deteriorates, and little change in notch fatigue life are observed. The most significant improvement in HCF life and deterioration in LCF life are observed for equi-biaxial and orthogonal tensile pre-straining conditions due to the rotation of maximum shear stress plane and the rotation of the deformation concentrated region around the hard martensite. As the strength improves during pre-straining, there is a corresponding increase in stress concentration around a notch, and as a result, no significant change in notch fatigue life is observed.
4 citations
TL;DR: In this paper, the influence of the 10% uniaxial and equi-biaxial tensile pre-strain on the notch fatigue performance of DP590 steel is investigated.
4 citations
01 Jan 2022-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the fatigue behavior of dual-phase steels (DP600) under cyclic shear path is studied and the effects of strain ratio are analyzed. Based on twin bridge shear specimens, complete reverse strain-controlled fatigue tests are carried out on DP600 sheet (1.2mm) under different strain ratios (R = ǫ−1, −0.5, 0, and 0.5).
Abstract: The fatigue behaviors of dual-phase steels (DP600) under cyclic shear path are studied and the effects of strain ratio are analyzed. Based on twin bridge shear specimens, complete reverse strain-controlled fatigue tests are carried out on DP600 sheet (1.2 mm) under different strain ratios (R = −1, −0.5, 0, and 0.5) with strain amplitudes in the range 0.8–3.0%. DP600 exhibits cyclic softening with a relatively constant softening rate related to amplitude and strain ratio. Smaller loading amplitude and higher strain ratio are beneficial to improve the softening ability of the material. The γ-fiber-type ( //ND) texture components are well developed at higher strain ratios, which improve the fluidity of the dual-phase steel, thus making the microstructure deformation more uniform and reducing the risk of damage caused by deformation compatibility. The uniform deformation of the material improves the absorption of plastic strain energy. Therefore, higher strain ratios are beneficial to improve the fatigue life of dual-phase steel.
4 citations
01 Jan 2022-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article , the fatigue behaviors of dual-phase steels (DP600) under cyclic shear path are studied and the effects of strain ratio are analyzed. But the effect of strain ratios on the softening ability of the material was not analyzed.
Abstract: The fatigue behaviors of dual-phase steels (DP600) under cyclic shear path are studied and the effects of strain ratio are analyzed. Based on twin bridge shear specimens, complete reverse strain-controlled fatigue tests are carried out on DP600 sheet (1.2 mm) under different strain ratios (R = −1, −0.5, 0, and 0.5) with strain amplitudes in the range 0.8–3.0%. DP600 exhibits cyclic softening with a relatively constant softening rate related to amplitude and strain ratio. Smaller loading amplitude and higher strain ratio are beneficial to improve the softening ability of the material. The γ-fiber-type (<111>//ND) texture components are well developed at higher strain ratios, which improve the fluidity of the dual-phase steel, thus making the microstructure deformation more uniform and reducing the risk of damage caused by deformation compatibility. The uniform deformation of the material improves the absorption of plastic strain energy. Therefore, higher strain ratios are beneficial to improve the fatigue life of dual-phase steel.
4 citations
References
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TL;DR: In this article, the cyclic deformation and fatigue crack initiation in polycrystalline ductile solids was studied and a total-life approach was proposed to deal with the problem.
Abstract: Preface 1. Introduction and overview Part I. Cyclic Deformation and Fatigue Crack Initiation: 2. Cyclic deformation in ductile single crystals 3. Cyclic deformation in polycrystalline ductile solids 4. Fatigue crack initiation in ductile solids 5. Cyclic deformation and crack initiation in brittle solids 6. Cyclic deformation and crack initiation in noncrystalline solids Part II. Total-Life Approaches: 7. Stress-life approach 8. Strain-life approach Part III. Damage-Tolerant Approach: 9. Fracture mechanics and its implications for fatigue 10. Fatigue crack growth in ductile solids 11. Fatigue crack growth in brittle solids 12. Fatigue crack growth in noncrystalline solids Part IV. Advanced Topics: 13. Contact fatigue: sliding, rolling and fretting 14. Retardation and transients in fatigue crack growth 15. Small fatigue cracks 16. Environmental interactions: corrosion-fatigue and creep-fatigue Appendix References Indexes.
4,158 citations
TL;DR: This work reviews the current state of technology in terms of strain analysis using EBSD and the effects of both elastic and plastic strain on individual EBSD patterns will be considered.
Abstract: Since the automation of the electron backscatter diffraction (EBSD) technique, EBSD systems have become commonplace in microscopy facilities within materials science and geology research laboratories around the world. The acceptance of the technique is primarily due to the capability of EBSD to aid the research scientist in understanding the crystallographic aspects of microstructure. There has been considerable interest in using EBSD to quantify strain at the submicron scale. To apply EBSD to the characterization of strain, it is important to understand what is practically possible and the underlying assumptions and limitations. This work reviews the current state of technology in terms of strain analysis using EBSD. First, the effects of both elastic and plastic strain on individual EBSD patterns will be considered. Second, the use of EBSD maps for characterizing plastic strain will be explored. Both the potential of the technique and its limitations will be discussed along with the sensitivity of various calculation and mapping parameters.
964 citations
TL;DR: In this article, the basic concepts of advanced high strength steels (AHSS) for use in the automobile industry, including chemical composition design, microstructure and mechanical properties development during thermomechanical processing, production technology characterisation, potential applications and performance in service, are presented.
648 citations
TL;DR: In this article, the microscopic strain distribution of a dual phase steel at the grain scale was measured using digital image correlation based on scanning electron microscopy topography images at large strains, and the results showed how strain is partitioned between the ferritic and martensitic regions.
289 citations
TL;DR: In this paper, the dynamic tensile characteristics of transformation-induced plasticity (TRIP)-type and dual phase (DP)-type steel sheets at intermediate strain rates ranging from 0.003 to 200 ǫ s −1 were investigated with the evaluation of stress-strain curves, the strain rate sensitivity, the fracture elongation and the effect of prestrain.
216 citations