کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5017698 | 1466717 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure of Ti-45Al-8.5Nb-0.2W-0.03Y electron beam welding joints
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی صنعتی و تولید
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
High Nb containing TiAl alloys showed susceptibility to cold cracking when welding was performed without preheating and post-heating; however, crack-free welds could be made with pre- and post-heating. The room-temperature strength of the crack-free welds was 480 MPa, and failure occurred in the base metal. The fusion zone obtained at a beam current of 7 mA mainly comprised coarse β/B2-phase grains, with acicular α2 and γ phases distributed at the grain boundaries. The fusion zone obtained at 13 mA mainly contained fine γ- and α2-phase grains. The fusion zone obtained with pre- and post-heating was dominated by the acicular α phase, reticular β/B2 phase, and blocky γ phase. The heat-affected zone could be divided into two characteristic regions according to the morphologies of the α2 and γ phases. Changes in microhardness were analyzed with respect to the phase composition and microstructural morphology.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Materials Processing Technology - Volume 250, December 2017, Pages 401-409
Journal: Journal of Materials Processing Technology - Volume 250, December 2017, Pages 401-409
نویسندگان
Yuxuan Li, Houqin Wang, Ke Han, Xiaopeng Li, Binggang Zhang,