Effect of Homogenizing and Age Hardening on Mechanical PropertyEnhancement of TIG Welded Al6061 SiCp Composites

Jayashree, P K and Sharma, S S and Shetty, Raviraj (2017) Effect of Homogenizing and Age Hardening on Mechanical PropertyEnhancement of TIG Welded Al6061 SiCp Composites. Materials Science Forum, 909. pp. 89-93. ISSN 1662-9752

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Abstract

This paper explains the type of heat treatments used to improve the bulk hardness andtensile properties of Tungsten Inert Gas (TIG) welded Al6061-SiC reinforced composites. Composites with 8, 10 and 12 wt% of SiC (25 μm) are TIG welded using ER5356 filler materialand the hardness, tensile property and microstructural analysis in as weld condition is carried out.Age hardening heat treatment is performed and peak hardness values are noted at different agingtemperatures and subjected to characterization. Al6061-12 wt% SiC shows reduction in tensilestrength in comparison with the other two in spite of improvement in hardness. Since hardness ismore, there arise ambiguity in knowing the actual cause of decrease in the tensile strength. Opticalicrographs of the samples are taken and identified the presence of dendritic segregation as the actual cause for the (UTS) reduction. To remove dendritic segregation, all the as weld samples aresubjected to 5h homogenizing at 500°C, age hardened and characterized. The result showedsubstantial hike in UTS with substantial improvement in hardness, homogeneous distribution of hardness over the cross-section in the weld bead. The depth and distribution of hardness and bulkproperty improvement are observed by the combined effect of homogenizing and low temperatureage hardening.

Item Type: Article
Uncontrolled Keywords: TIG, Al 6061-SiC, age hardening, UTS, dendritic segregation, homogenizing
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 23 Nov 2017 05:49
Last Modified: 23 Nov 2017 05:49
URI: http://eprints.manipal.edu/id/eprint/150050

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