Effect of Strain on the Anisotropy Coefficient of Sheet Alloys AA2024, Ti-2Al-1Mn, Titanium Grade 2, STEEL X10CrNiTi18-9

Abstract:

Anisotropy of the plastic properties is an index of sheet’s ability to stamping. In this work the transverse deformation coefficient and r-value were used. Uniaxial test was made for annealed pieces of 1 mm thickness from aluminum alloy AA2024, steel X10CrNiTi18-9, Titanium Grade 2 and titanium alloy Ti-2Al-1Mn. Pieces were cut at angle of 0, 22.5, 45, 67.5 and 90O to the rolling direction. Steel pieces have anisotropy coefficients practically independent from angle between it’s’ axis and the rolling direction. Pieces made of AA2024 cut at angle 45О to the rolling direction have largest anisotropy coefficients. Titanium alloys have the largest coefficients for angle 67,5О between axis of piece and the rolling direction. Both indexes of anisotropy are higher for titanium alloys, which is property of HCP-metals.

• Periodical: Key Engineering Materials (Volume 684)
• Pages: 366-370
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.684.366
• Online since: February 2016
• Authors: Ekaterina Nosova, Fedor Vasilievich Grechnikov
• Keywords: Aluminum, Anisotropy, R-Value, Sheet Alloys, Steel, Titanium, Transverse Strain Coefficient

References

[1] Giuseppe Sala, A numerical and experimental approach to optimise sheet stamping technologies: part II - aluminium alloys rubber-forming, Materials and Design. 22 (2001) 299-315.

DOI: 10.1016/s0261-3069(00)00088-1

[2] Zhang De-Hai, Bai Dai-Ping, Liu Ji-bin, Guo Zhe, Guo Cheng, Formability behaviors of 2A12 thin-wall part based on DYNAFORM and stamping experiment, Composites: Part B. 55 (2013) 591–598.

DOI: 10.1016/j.compositesb.2013.07.001

[3] Nicolas Tardif, Stelios Kyriakides, Determination of anisotropy and material hardening for aluminum sheet metal, International Journal of Solids and Structures. 49 (2012) 3496–3506.

DOI: 10.1016/j.ijsolstr.2012.01.011

[4] A. Güner, C. Soyarslan, A. Brosius, A.E. Tekkaya, Characterization of anisotropy of sheet metals employing inhomogeneous strain fields for Yld2000-2D yield function, International Journal of Solids and Structures. 49 (2012) 3517–3527.

DOI: 10.1016/j.ijsolstr.2012.05.001

[5] Olaf Engler, Carmen Schäfer, Ole Runar Myhr, Effect of natural ageing and pre-straining on strength and anisotropy in aluminium alloy AA 6016, Materials Science & Engineering A. 639 (2015) 65–74.

DOI: 10.1016/j.msea.2015.04.097

[6] Giuseppe Sala, A numerical and experimental approach to optimise sheet stamping technologies, Part I: mild steel press-forming, Materials and Design. 22 (2001) 285-298.

DOI: 10.1016/s0261-3069(00)00087-x

[7] Masaaki Nakaia, Mitsuo Niinomia, Junko Hiedaa, Ken Choa, Yuya Nagasawab, Takashi Konnoc, Yoshinori Itod, Yoshio Itsumic, Hideto Oyamac, Reduction in anisotropy of mechanical properties of coilable (α+β)-type titanium alloy thin sheet through simple heat treatment for use in next-generation aircraft applications, Materials Science and Engineering: A. Volume 594, 31 (2014).

DOI: 10.1016/j.msea.2013.11.055

[8] Y.G. An, H. Vegter, S. Melzer, P. Romano Triguero, Evolution of the plastic anisotropy with straining and its implication on formability for sheet metals, Journal of Materials Processing Technology, Volume 213. 8 (2013) 1419–1425.

DOI: 10.1016/j.jmatprotec.2013.02.008

[9] Fusahito Yoshida, Hiroshi Hamasaki, Takeshi Uemori, A model of anisotropy evolution of sheet metals, Procedia Engineering. 81 (2014) 1216 – 1221.

DOI: 10.1016/j.proeng.2014.10.100

[10] Jurij Sidor, Roumen H. Petrov, Leo A.I. Kestens, Deformation, recrystallization and plastic anisotropy of asymmetrically rolled aluminum sheets, Materials Science and Engineering: A, Volume 528. 1 (2010) 413–424.

DOI: 10.1016/j.msea.2010.09.023