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Influence of pre-strain on fracture toughness of 3rd generation advanced high strength steels
GRIFÉ Laura, FRÓMETA David, PAYÀ Anna, CASELLAS Daniel
download PDFAbstract. The present work investigates the influence of pre-strain on the fracture toughness of 3rd Generation Advanced High Strength Steels (AHSS). Specifically, a Carbide Free Bainitic (CFB) and a Quenching and Partitioning (Q&P) steel have been studied, the properties of which are crucial for lightweight vehicle construction. Fracture toughness, which is a key parameter for crash performance applications, is assessed using the Essential Work of Fracture methodology. The study investigates the pre-straining states of uniaxial tension, plane strain, and equibiaxial tension in 1.5 mm Q&P and 1.4 mm CFB sheet-form steels of 1180 MPa tensile strength. Overall, Q&P steel demonstrates superior fracture toughness compared to CFB steel. Remarkably, the specific essential work of fracture (we) remains unaffected by pre-straining across different strain states. Nevertheless, pre-straining exerts a notable influence on the non-essential plastic work (βwp) due to the plastic energy consumed during pre-deformation. These results suggest that pre-strain has little or no influence on the fracture properties of AHSS, which is relevant for the design and manufacturing of high crash-performance and safety-related components.
Keywords
Fracture Toughness, Pre-Deformation, 3rd Gen Advanced High Strength Steels
Published online 4/24/2024, 9 pages
Copyright © 2024 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: GRIFÉ Laura, FRÓMETA David, PAYÀ Anna, CASELLAS Daniel, Influence of pre-strain on fracture toughness of 3rd generation advanced high strength steels, Materials Research Proceedings, Vol. 41, pp 1206-1214, 2024
DOI: https://doi.org/10.21741/9781644903131-134
The article was published as article 134 of the book Material Forming
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
References
[1] P.J. Jacques, Q. Furnémont, F. Lani, T. Pardoen, F. Delannay, Multiscale mechanics of TRIP-assisted multiphase steels: Characterization and mechanical testing. Acta Mater. 55 (2007) 3681–3693. https://doi.org/10.1016/j.actamat.2007.02.029
[2] D. Frómeta, A. Lara, S. Molas, D. Casellas, J. Rehrl, C. Suppan, P. Larour, J. Calvo, On the correlation between fracture toughness and crash resistance of advanced high strength steels, Eng. Frac. Mech. 205 (2019) 319-332. https://doi.org/10.1016/j.engfracmech.2018.10.005
[3] D. Casellas, A. Lara, D. Frómeta, D. Gutiérrez, S. Molas, Ll. Pérez, J. Rehrl, C Suppan. Fracture toughness to understand stretch-flangeability and edge cracking resistance in AHSS. Metallurgical and Materials Transactions A 48 (2017) 86-94. https://doi.org/10.1007/s11661-016-3815-x
[4] D.Frómeta, M. Tedesco, J. Calvo, A. Lara, S. Molas, D. Casellas. Assessing edge cracking resistance in AHSS automotive parts by the Essential Work of Fracture methodology. Journal of Physics: Conference Series 896 (2017) p. 012102. https://doi.org/10.1088/1742-6596/896/1/012102
[5] D. Frómeta, A. Lara, S. Parareda, D. Casellas. Evaluation of edge formability in high strength sheets through a fracture mechanics approach. AIP conference proceedings 2113 (2017) .
[6] D. Frómeta, A. Lara, B Casas, D. Casellas, Fracture toughness measurements to understand local ductility of advanced high strength steels. IOP Conference Series: Materials Science and Engineering 65 (2019) p. 012071. https://doi.org/10.1088/1757-899X/651/1/012071
[7] CWA 17793:2021, Test method for determination of the essential work of fracture of thin ductile metallic sheets.
[8] D. Frómeta, S.,Parareda, A. Lara, S. Molas, D. Casellas, P., Jonsén, J. Calvo. Identification of fracture toughness parameters to understand the fracture resistance of advanced high strength sheet steels. Engineering fracture mechanics 229 (2020) 106949. https://doi.org/10.1016/j.engfracmech.2020.106949
[9] Y.W. Mai and P. Powell. Essential work of fracture and J-integral measurements for ductile polymers. J. Polym. Sci. 29 (1991) 785-793. https://doi.org/10.1002/polb.1991.090290702
[10] ASTM E1820. Standard test method for measurement of fracture toughness. American Society for Testing and Materials.
[11] A. Hilhorst, T. Pardoen, P.J. Jacques, Optimization of the essential work of fracture method for characterization of the fracture resistance of metallic sheets. Engineering Fracture Mechanics 268 (2022) 108442. https://doi.org/10.1016/j.engfracmech.2022.108442
[12] D. Frómeta, N. Cuadrado, J. Rehrl, C. Suppan, T. Dieudonné, P. Dietsch, J. Calvo, D. Casellas, Microstructural effects on fracture toughness of ultra-high strength dual phase sheet steels, Materials Science & Engineering A 802 (2021) 140631. https://doi.org/10.1016/j.msea.2020.140631
[13] A.D. Hodges, S. Tedesco, L. Golem, G. Huang, Strain Amount and Strain Path Effects on Instrumented Charpy Toughness of Baked Third Generation Advanced High Strength Steels. SAE Technical Paper 2021-01-0266, 2021, doi:10.4271/2021-01-0266. https://doi.org/10.4271/2021-01-0266
[14] A. Payà, A. Lara, D. Frómeta, M. Marés, I. Gil, and C. Arenillas. Effect of pre-strain on edge formability of high strength steels for chassis applications. In IOP Conference Series: Materials Science and Engineering (Vol. 1284, No. 1, p. 012025). IOP Publishing (2023). https://doi.org/10.1088/1757-899X/1284/1/012025
