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Title: The Evolution of the Weld Metal Microstructures in Dissimilar Titanium Welds Based on Al and Mo Equivalents
Authors: Yun-Da Tsai
Cheng-Ta Hsieh
Ren-Kae Shiue
Leu-Wen Tsay
Contributors: 國立臺灣海洋大學:材料工程研究所
Keywords: dissimilar welding
notched strength
titanium alloy
weld metal
Date: 2017-12
Issue Date: 2018-10-22T08:09:02Z
Publisher: J. Mats. Eng. Perf.
Abstract: Abstract: CO2 laser welding of Ti-15V-3Cr-3Al-3Sn to Ti-4.5Al-3V-2Fe-2Mo was conducted in the study. The notched fracture and microstructures of the weld metal (WM) with various post-weld aging treatments were studied. In the as-welded sample, the WM comprised only β phase, which was relatively soft and ductile. Moreover, the phase constituent of the as-welded WM was related to the Al and Mo equivalents and further compared with other welds. The microstructural morphologies and microhardness of the WMs of dissimilar welds exhibited significant changes after post-weld aging at distinct temperatures. Increasing the Al equivalent ([Al]EQ) of the WM caused an increased response to age-hardening during post-weld aging treatments. When the aging temperature was increased from 426 to 593 °C, the α precipitates in the WM grew in size, causing a decrease in hardness, but an improvement in toughness.
Relation: 26(12) pp.6006-6012
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50745
Appears in Collections:[材料工程研究所] 期刊論文

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