Please use this identifier to cite or link to this item:
http://bura.brunel.ac.uk/handle/2438/12120
Title: | Effect of melt conditioning on heat treatment and mechanical properties of AZ31 alloy strips produced by twin roll casting |
Authors: | Das, S Barekar, NS El Fakir, O Wang, L Prasada Rao, AK Patel, JB Kotadia, HR Bhagurkar, A Dear, JP Fan, Z |
Keywords: | Twin roll casting;Solidification;Tensile test;Fracture analysis;Optical and scanning electron microscopy |
Issue Date: | 2014 |
Publisher: | Elsevier |
Citation: | Materials Science and Engineering A, 620 pp. 223 - 232, (2014) |
Abstract: | In the present investigation, magnesium strips were produced by twin roll casting (TRC) and melt conditioned twin roll casting (MC-TRC) processes. Detailed optical microscopy studies were carried out on as-cast and homogenized TRC and MC-TRC strips. The results showed uniform, fine and equiaxed grain structure was observed for MC-TRC samples in as-cast condition. Whereas, coarse columnar grains with centreline segregation were observed in the case of as-cast TRC samples. The solidification mechanisms for TRC and MC-TRC have been found completely divergent. The homogenized TRC and MC-TRC samples were subjected to tensile test at elevated temperature (250-400 °C). At 250 °C, MC-TRC sample showed significant improvement in strength and ductility. However, at higher temperatures the tensile properties were almost comparable, despite of TRC samples having larger grains compared to MC-TRC samples. The mechanism of deformation has been explained by detailed fractures surface and sub-surface analysis carried out by scanning electron and optical microscopy. Homogenized MC-TRC samples were formed (hot stamping) into engineering component without any trace of crack on its surface. Whereas, TRC samples cracked in several places during hot stamping process. |
URI: | http://www.sciencedirect.com/science/article/pii/S0921509314012623 http://bura.brunel.ac.uk/handle/2438/12120 |
DOI: | http://dx.doi.org/10.1016/j.msea.2014.10.019 |
ISSN: | 0921-5093 |
Appears in Collections: | Brunel Centre for Advanced Solidification Technology (BCAST) |
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