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Effect of melt conditioning on heat treatment and mechanical properties of AZ31 alloy strips produced by twin roll casting

Das, Sanjeev and Barekar, NS and Fakir, Omer El and Wang, Liliang and A. K., Prasada Rao and Patel, JB and Kotadia, HR and Bhagurkar, A and Dear, John P and Fan, Z (2014) Effect of melt conditioning on heat treatment and mechanical properties of AZ31 alloy strips produced by twin roll casting. Materials Science and Engineering: A, 620. pp. 223-232. ISSN 0921-5093

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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 solidi fication 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 (250–4001C). At 2501C, 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

Item Type: Article
Uncontrolled Keywords: Twin roll casting; Solidification; Tensile test; Fracture analysis; Optical and scanning electron microscopy
Subjects: T Technology > TN Mining engineering. Metallurgy
Faculty/Division: Faculty of Manufacturing Engineering
Depositing User: Ass. Prof. Dr. Kameswari Prasada Rao Ayyagari
Date Deposited: 16 Dec 2014 04:17
Last Modified: 12 Mar 2018 02:28
URI: http://umpir.ump.edu.my/id/eprint/7741
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