کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10417400 | 902360 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of molten pool boundaries on the mechanical properties of selective laser melting parts
ترجمه فارسی عنوان
اثر مرزهای استیل مذاب بر خواص مکانیکی قطعات ذوب لیزری انتخابی
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کلمات کلیدی
ذوب لیزری انتخابی، مرزهای استخر سرامیکی، خواص کششی، ناهمسانگردی،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی صنعتی و تولید
چکیده انگلیسی
Selective laser melting (SLM) manufactures components through the overlapping of multi-track and multi-layer molten pools of metal powders, resulting in two types of molten pool boundaries (MPBs), “layer-layer” and “track-track” MPBs, remaining in SLM parts. The microstructure of MPBs exhibits a complex and regular spatial topological structure. There is a coarse grain zone below the MPBs and nonmetallic elements (C, O, Si) near the MPBs are in an unstable state. Long and thin columnar grains with the same orientations distribute on two sides of the “layer-layer” MPBs, whereas the columnar grains on both sides of “track-track” MPBs have different orientations. The “track-track” MPBs are short and intersect with “layer-layer” MPBs at some points and form acute angles, where cracks are initiated when applied with external loads. The effect of the MPBs on microscopic slipping, macroscopic ductility and fracture mechanism of the SLM parts made along different directions, which were exerted a tensile loading in the as-built condition without heat treatment, was analyzed and evaluated using slip theory and experiments. The results reveal that the MPBs have a significant impact on the microscopic slipping at the loading, macroscopic plastic behavior and fracture mode, and are one of the main reasons for the obvious anisotropy and low ductility of SLM parts.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Materials Processing Technology - Volume 214, Issue 11, November 2014, Pages 2660-2667
Journal: Journal of Materials Processing Technology - Volume 214, Issue 11, November 2014, Pages 2660-2667
نویسندگان
Wen Shifeng, Li Shuai, Wei Qingsong, Chunze Yan, Zhang Sheng, Shi Yusheng,