http://scholars.ntou.edu.tw/handle/123456789/4683
標題: | The Evolution of the Weld Metal Microstructures in Dissimilar Titanium Welds Based on Al and Mo Equivalents | 作者: | Yun-Da Tsai Cheng-Ta Hsieh Ren-Kae Shiue Leu-Wen Tsay |
關鍵字: | dissimilar welding;hardness;notched strength;titanium alloy;weld metal | 公開日期: | 十二月-2017 | 卷: | 26 | 期: | 12 | 起(迄)頁: | 6006–6012 | 來源出版物: | Journal of Materials Engineering and Performance | 摘要: | 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. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/4683 | ISSN: | 1059-9495 | DOI: | 10.1007/s11665-017-3034-7 |
顯示於: | 光電與材料科技學系 |
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