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In-process failure analysis of thin-wall structures made by laser powder bed fusion additive manufacturing

Journal of Materials Science & Technology 2022年第3期98卷 233-243页

作者： Apratim Chakraborty Reza Tangestani Rasim Batmaz Waqas Muhammad Philippe Plamondon Andrew Wessman Lang Yuan Étienne Martin University of Waterloo 200 University Avenue WestWaterlooON N2L 3G1Canada Polytechnique Montréal 2500 Chemin de PolytechniqueMontréalQC H3T 1J4Canada University of Arizona 1235 E.James E.Rogers WayTucsonAZ 85721-0012United States University of South Carolina 301 Main StreetColumbiaSC 29208United States

Fabrication of thin-wall components using the laser powder bed fusion(LPBF)additive manufacturing(AM)technology was investigated for two“hard-to-weld”high gamma prime Ni-based superalloys RENé65(R65)and RENé108(R108).Simple block parts with wall thicknesses of 0.25 mm,1.00 mm,and5.00 mm are printed using a bidirectional laser scanning strategy without layer-wise *** with walls thinner than 5 mm fail before reaching the designated build *** indicate that reduction of limiting build height(LBH)corresponds to the reduction of part thickness and is unaffected by alloy *** the contrary,the number of internal micro-cracks along columnar grain boundaries in the build direction(BD)increases with part thickness and is significantly higher in R108 than *** findings suggest that reduced LBH in parts with thinner walls is not caused by internal micro-crack *** and finite element analysis(FEA)of the in-process thermal stresses show that the LBH trend is not explained by the conventional cracking *** suggest that part thickness affects stress distribution leading to more substantial distortion and consequent failure to add layers for continued fabrication of thinner parts.

关键词： Laser powder bed fusion Superalloys thin-wall Residual stress Additive manufacturing

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The Relationship between Bulk Property and Property Distribution in thin-wall Injection Molded PP at Different Molecular Weight and Molecular Weight Distribution

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Advances in Materials Physics and Chemistry 2016年第1期6卷 1-8页

作者： Keisuke Maeda Koji Yamada Kazushi Yamada Masaya Kotaki Hiroyuki Nishimura Department of Advanced Fibro Science Kyoto Institute of Technology Kyoto Japan Osaka Municipal Technical Research Institute Osaka Japan Center for Fiber and Textile Science Kyoto Institute of Technology Kyoto Japan Kaneka US Material Research Center Kaneka Americas Holding Inc. TX USA

thin-wall injection molded parts have been paid much attention to the lightweight saving from viewpoints of natural resources saving. In the injection molding, skin-core structure can be found in the parts. This skin-core structure affects the property of completed injection molding parts (bulk property) even if in thin-wall injection molding. However, there is a few research about the relationship between bulk property and internal property distribution in the injection molding specimen. In this study, thin-wall injection molded parts of polypropylene (PP) were prepared by 4 different molecular weight and molecular weight distribution to reveal the relationship between bulk property and property distribution. These characteristics were investigated by using tensile test, fracture toughness characterized by Essential Work of Fracture (EWF) method for bulk property and film tensile test by sliced sample for tensile property distribution. The property distribution test results revealed that the highly bulk property sample had thicker highly mechanical property layer on its surface.

关键词： Molecular Weight Molecular Weight Distribution Fracture Toughness Property Distribution thin-wall Injection Molding

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