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Densification and crack suppression in selective laser melting of pure molybdenum
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Number of Authors: 5
2017 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 129, 44-52 p.Article in journal (Refereed) Published
Abstract [en]

In this study, dense and crack-free pure Mo has been fabricated by selective laser melting. In order to obtain densification, the precursor powders were granulated and processed by plasma spheroidization. Parts of density of 10.16 g/cm(3) (99.1% of theoretical density) were obtained with spherical powders because of its increased laser absorptivity and packing density. The crack growth behaviors under various scanning strategies are analyzed by electron backscattered diffraction. The interlocking grain boundary structure, which increased the crack growth resistance and caused crack deviation, is formed under layer-wise rotated laser scanning. Cracks can be fully suppressed by applying the designed supporting structure. This study provides a novel route for the fabrication of complex Mo parts.

Place, publisher, year, edition, pages
2017. Vol. 129, 44-52 p.
Keyword [en]
Selective laser melting, Pure molybdenum, Powders spheroidization, Crack growth, Grain boundary structure
National Category
Chemical Sciences Materials Engineering
Identifiers
URN: urn:nbn:se:su:diva-145949DOI: 10.1016/j.matdes.2017.04.094ISI: 000405099900006OAI: oai:DiVA.org:su-145949DiVA: diva2:1134746
Available from: 2017-08-21 Created: 2017-08-21 Last updated: 2017-08-21Bibliographically approved

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Shen, Zhijian
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Department of Materials and Environmental Chemistry (MMK)
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