کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7969139 | 1514345 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Selective electron beam melting of TiAl alloy: Microstructure evolution, phase transformation and microhardness
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this research, a Ti-47Al-2Cr-2Nb alloy was fabricated by selective electron beam melting (SEBM). The microstructures at different heights of SEBM-produced TiAl alloy sample and their contribution to microhardness were investigated. The results revealed that the last deposited layers displayed near lamellar structure with fine α2 lamellae. Lamellar colonies degraded at the height of 19â¯mm of the as-built sample, accompanied with the α2 lamellae decomposition and B2 precipitation along primary α2 lamellae. Meanwhile, equiaxed γ and blocky B2 phase dispersed on the colony boundaries. Lamellar colonies further degraded and colony boundaries further coarsen at the heights of 15â¯mm and 5â¯mm due to the in-situ heat treatment during SEBM process. Three kinds of phase transformations could be observed during SEBM process, which were α2â¯ââ¯Î³, α2â¯ââ¯B2 and α2â¯+â¯Î³â¯ââ¯B2. The microhardness exhibited slight fluctuation as the building height increased from 3â¯mm to 19â¯mm, and the microhardness rapidly increased with the building height increasing from 19â¯mm to 20â¯mm. Eventually, the mechanism of microstructure evolution during SEBM process was discussed in detail.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 142, August 2018, Pages 584-592
Journal: Materials Characterization - Volume 142, August 2018, Pages 584-592
نویسندگان
Yuyong Chen, Hangyu Yue, Xiaopeng Wang, Shulong Xiao, Fantao Kong, Xiangkui Cheng, Hui Peng,