کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5455473 | 1514643 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure evolution and embrittlement of electron beam welded TZM alloy joint
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
To investigate the influence of microstructure evolution on mechanical properties of a molybdenum-titanium-zirconium (TZM) alloy joint welded by electron beam welding (EBW), detailed microstructure of the joint was examined by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The microhardness of the cross section was measured and tensile strengths at temperatures of 293Â K as well as 1273Â K were tested. The crystallized grains of weld zone (WZ) were coarsened severely, but the dispersed distribution of Mo2C and ZrO2 particles inside grains caused the microhardness of WZ to be higher than that of heat affected zone (HAZ). MoO2 and TiO2 precipitates easily segregated on grain boundaries due to microsegregation. Since the large differences in the interatomic distance between Mo/MoO2 and Mo/TiO2, the precipitates segregated on grain boundaries and Mo matrix were deemed to be incoherent. Thus, tensile strength of the welded joint was just 50% of that of base metal and the elongation was nearly decreased to zero with a brittle fracture mode.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 700, 17 July 2017, Pages 512-518
Journal: Materials Science and Engineering: A - Volume 700, 17 July 2017, Pages 512-518
نویسندگان
Yongyun Zhang, Ting Wang, Siyuan Jiang, Binggang Zhang, Yong Wang, Jicai Feng,