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In-process failure analysis of thin-wall structures made by laser powder bed fusion additive manufacturing 被引量:1
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作者 Apratim Chakraborty Reza Tangestani +5 位作者 rasim batmaz Waqas Muhammad Philippe Plamondon Andrew Wessman Lang Yuan Étienne Martin 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第3期233-243,共11页
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 REN... 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 rotation.Parts with walls thinner than 5 mm fail before reaching the designated build height.Results indicate that reduction of limiting build height(LBH)corresponds to the reduction of part thickness and is unaffected by alloy composition.On 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 R65.These findings suggest that reduced LBH in parts with thinner walls is not caused by internal micro-crack formation.Fractography and finite element analysis(FEA)of the in-process thermal stresses show that the LBH trend is not explained by the conventional cracking mechanism.Simulations suggest that part thickness affects stress distribution leading to more substantial distortion and consequent failure to add layers for continued fabrication of thinner parts. 展开更多
关键词 Laser powder bed fusion SUPERALLOYS Thin-wall Residual stress Additive manufacturing
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