Influence of Heat-Treatment and Rolling Conditions on the Mechanical Warm Forming Properties of Twin-Roll Cast AZ31

Article Preview

Abstract:

Magnesium sheets are used for wide-ranging applications in the automotive sector. In contrast to conventional magnesium processing routes for strips, twin-roll casting (TRC) and hot rolling is a cost-efficient production process for magnesium strips and sheets. As part of previous research strategies, the optimization of the thermomechanical treatment of magnesium alloys has resulted in excellent mechanical properties for the component design. However, the previously determined results at room temperature cannot be correlated with the warm forming behaviour during the component production. This is due to different deformation mechanisms, which are active at various temperatures. For TRC material, there is a lack of knowledge about the influence of heat-treatment and rolling on the final mechanical properties at hot working temperatures. This article depicts the investigations done on the influence of heat-treatment and hot rolling conditions on the mechanical properties of AZ31 strips at tensile deformation temperatures of 20 °C and 300 °C.

You might also be interested in these eBooks

Info:

Periodical:

Pages:

184-191

Citation:

Online since:

July 2017

Export:

Price:

* - Corresponding Author

[1] B.L. Mordike, T. Ebert, Magnesium: Properties – applications – potential, Mater. Sci. Eng. A 302 (2001) 37–45.

Google Scholar

[2] F. Berge, L. Krüger, M. Ullmann, C. Krbetschek, R. Kawalla, Anisotropy of the mechanical properties of twin-roll cast, rolled and heat-treated AZ31 as a function of temperature and strain rate, Materials Today: Proceedings 2 (2015) 233–241.

DOI: 10.1016/j.matpr.2015.05.020

Google Scholar

[3] R. v. Mises, Mechanik der plastischen Formänderung von Kristallen, Z. angew. Math. Mech. 8 (1928) 161–185.

DOI: 10.1002/zamm.19280080302

Google Scholar

[4] E. Beeh, P. Zhou, H.E. Friedrich, P. Straßburger, T. Grünheid, W. Altenhof, M. Worswick, S. Kim, Novel Concepts for the Application of Magnesium Sheets and Profiles in Crash Loaded Vehicle Areas, MSF 879 (2016) 211–216.

DOI: 10.4028/www.scientific.net/msf.879.211

Google Scholar

[5] F. Berge, L. Krüger, C. Ullrich, Forming limit diagrams of twin-roll cast, rolled and heat-treated AZ31 as a function of temperature and loading rate, Mater. Sci. Eng. A614(2014)27–35.

DOI: 10.1016/j.msea.2014.07.007

Google Scholar

[6] F. Berge, L. Krüger, H. Ouaziz, C. Ullrich, Influence of temperature and strain rate on the flow stress behavior of twin-roll cast, rolled and heat-treated AZ31 magnesium alloy, Transactions of Nonferrous Metals Society of China 25 (2015) 1–13.

DOI: 10.1016/s1003-6326(15)63572-5

Google Scholar

[7] M.R. Barnett, A Taylor model based description of the proof stress of magnesium AZ31 during hot working, Metall. Mat. Trans. A 34 (2003) 1799–1806.

DOI: 10.1007/s11661-003-0146-5

Google Scholar

[8] M. Ullmann, F. Berge, K. Neh, R. Kawalla, Development of a rolling technology for twin-roll cast magnesium strips, Metalurgija 54 (2015) 711–714.

DOI: 10.1002/9781119274803.ch71

Google Scholar

[9] M. Ullmann, R. Kawalla, H.P. Vogt, Deformation behaviour and microstructure development of Twin Roll Cast AZ31 strips, Metallurgia Italiana 106 (2014) 35–42.

DOI: 10.4028/www.scientific.net/kem.622-623.569

Google Scholar

[10] S. Gorelova, H. Schaeben, R. Kawalla, Quantifying texture evolution during hot rolling of magnesium Twin Roll Cast strip, Mater. Sci. Eng. A 602 (2014) 134–142.

DOI: 10.1016/j.msea.2014.02.057

Google Scholar

[11] S. Gorelova, M. Ullmann, M. Oswald, R. Kawalla, Effect of different finish-rolling parameters on the microstructure and mechanical properties of twin-roll-cast (TRC) AZ31 strips, Key Engineering Materials 554-557 274–279.

DOI: 10.4028/www.scientific.net/kem.554-557.274

Google Scholar

[12] C. Ullrich, F. Schwarz, A. Franke, T. Marr, D. Rafaja, L. Krüger, J. Freudenberger, The preparation of magnesium specimens for EBSD using ion polishing, Pract. Metallogr. 5 (2012) 290–304.

DOI: 10.3139/147.110172

Google Scholar

[13] S.S. Park, G.T. Bae, D.H. Kang, I. -H. Jung, K.S. Shin, N.J. Kim, Microstructure and tensile properties of twin-roll cast Mg–Zn–Mn–Al alloys, Scripta Materialia 57 (2007) 793–796.

DOI: 10.1016/j.scriptamat.2007.07.013

Google Scholar

[14] M. Ohno, D. Mirkovic, R. Schmid-Fetzer, Liquidus and solidus temperatures of Mg-rich Mg–Al–Mn–Zn alloys, Acta Mater. 54 (2006) 3883–3891.

DOI: 10.1016/j.actamat.2006.04.022

Google Scholar