کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7205781 | 1468627 | 2018 | 22 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Role of scan strategies on thermal gradient and solidification rate in electron beam powder bed fusion
ترجمه فارسی عنوان
نقش استراتژی های اسکن بر گرادیان حرارتی و سرعت خزش در همجوشی پودر الکترون
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کلمات کلیدی
تولید افزودنی، استراتژی اسکن، استخر ذوب، جامد سازی و بازسازی، مانیتورینگ در محل، شبیه سازی عددی،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی صنعتی و تولید
چکیده انگلیسی
Local microstructure control in electron beam powder bed fusion (EB-PBF) is of great interest to the additive manufacturing community to realize complex part geometry with targeted performance. The local microstructure control relies on having a detailed understanding of local melt pool physics (e.g., 3-D melt pool shape as well as spatial and temporal variations of thermal gradient (G) and solidification rate (R)). In this research, a new scan strategy referred to as ghost beam is numerically evaluated as a candidate to achieve the targeted G and R of IN718 alloy. The boundary conditions for simulations, including the speed (490â¯mm/s) and spatial locations of the beam within a given layer, are obtained by using series of snapshot images, recorded at 12,000 frames per second, using a high-speed camera. The heat transfer simulations were performed using TRUCHAS an open-source software deployed within a high-performance computational infrastructure. The simulation results showed that reheating at short beam on-time and time delay decreases both G and R. Local variation of R at the center of the melt pool trailing edge showed periodic temporal fluctuations. Finally, the ghost beam scan strategy was compared to other existing raster and spot scan strategies.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Additive Manufacturing - Volume 22, August 2018, Pages 516-527
Journal: Additive Manufacturing - Volume 22, August 2018, Pages 516-527
نویسندگان
Y.S. Lee, M.M. Kirka, R.B. Dinwiddie, N. Raghavan, J. Turner, R.R. Dehoff, S.S. Babu,