Strain Localization Behavior of Cold-Rolled Deep-Drawing Steels

Yıl 2019, Cilt: 15 Sayı: 1, 81 - 86, 22.03.2019

Mert Efe

https://doi.org/10.18466/cbayarfbe.471039

Öz

With the purpose of defining optimal microstructure and texture for
higher quality in deep–drawing operations of cold-rolled steels; this study
monitors and analyses the micro- and macro-scale deformation behavior of DC04
grade cold-rolled steel sheets under uniaxial tension and biaxial stretching.
An in-plane biaxial test setup capable of observing and measuring the
deformation is utilized for obtaining strain maps at the micro- and
macro-scale. Strain maps at the micro-scale are then compared with texture and
microstructure data obtained before and after the deformation. Results show
strain localization to the interior of grains under both strain paths, as
opposed to the common grain boundary localization observed in the literature.
Remnants of the α fiber components in the initial γ fiber texture, especially
grains with {100}<110> orientations, are the likely sources of the
localizations as they allow deformation in the sheet thickness direction. While
these localizations do not appear to be critical for macro-scale formability,
their suppression should be helpful in preventing surface defects and local
fracture. Total elimination of α fiber components from the initial texture is
proposed as a way preventing micro-scale localizations

Anahtar Kelimeler

forming, DC04, anisotropy, DIC, texture

Kaynakça

• 1. ThyssenKrupp Steel Europe, Deep-drawing steels DD, DC and DX Product Information. https://www.thyssenkrupp-steel.com/en/products/sheet-coated-products/mild-steel/mild-steel.html (accessed at 15.10.2018). 2. Banerjee, K. Physical metallurgy and drawability of extra deep drawing and interstitial free steels. In: Krzysztof S (ed) Recrystallization, IntechOpen, 2012, pp 137-178.
• 3. Hosford, WF, Caddell, RM. Metal Forming: Mechanics and Metallurgy; Prentice-Hall Inc.: New Jersey, USA, 1993.
• 4. Dillamore, IL, Roberts, JG, Bush, AC. 1979. Occurrence of shear bands in heavily rolled cubic metals. Metal Science; 13: 73-77.
• 5. Raabe, D, Sachtleber, M, Weiland, H, Scheele, G, Zhao, Z. 2003. Grain-scale micromechanics of polycrystal surfaces during plastic straining. Acta Materialia; 51: 1539-1560.
• 6. Efstathiou, C, Sehitoglu, H, Lambros, J. 2010. Multiscale strain measurements of plastically deforming olycrystalline titanium: Role of deformation hetererogeneities. International Journal of Plasticity; 26: 93-106.
• 7. Bieler, TR, Eisenlohr, P, Roters, F, Kumar, D, Mason, DE, Crimp, MA, Raabe, D. 2009. The role of heterogeneous deformation on damage nucleation at grain boundaries in single phase metals. International Journal of Plasticity; 25: 1655-1683.
• 8. Shin, HJ, An, JK, Park, SH, Lee, DN. 2013. The effect of texture on ridging of ferritic stainless steel. Acta Materialia; 51: 4693-4706.
• 9. Jafari, M, Ziaei-Rad, S, Saeidi, N, Jamshidian, M. 2016. Micromechanical analysis of martensite distribution on strain localization in dual phase steels by scanning electron microscopy and crystal plasticity simulation. Materials Science and Engineering A; 670: 57-67.
• 10. Abuzaid, WZ, Sangid, MD, Carroll, JD, Sehitoglu, H, Lambros, J. 2012. Slip transfer and plastic strain accumulation across grain boundaries in Hastelloy X. Journal of Mechanics and Physics of Solids; 60: 1201-1220.
• 11. Hutchinson, B. 1999. Deformation microstructures and textures in steels. Philosophical Transactions of the Royal Society A; 357: 1471-1485.
• 12. Seymen, Y, Güler, B, Efe, M. 2016. Large strain and small-scale biaxial testing of sheet metals. Experimental Mechanics; 56: 1519-1530.
• 13. Yang, HS, Seong, BS, Han, SH, Choi, SH. 2011. Texture evolution of monolithic-phase and dual-phase steel sheets during a deep-drawing process. Metals and Materials International; 17: 403-412.
• 14. Antolovich, SD, Armstrong, RW. 2014. Plastic strain localization in metals: origins and consequences. Progress in Materials Science; 59: 1-160.