Journal ArticleDOI
Integrated melt pool and microstructure control for Ti–6Al–4V thin wall additive manufacturing
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TLDR
In this paper, the authors show that beam power and beam velocity combinations yielding constant melt pool cross-sectional areas also yield constant solidification cooling rates for thin walled structures fabricated by wire feed electron beam AM.Abstract:
In additive manufacturing (AM), melt pool dimension control is needed to accurately build a geometry and determine process precision. Microstructure control is needed for its effect on mechanical properties. This research addresses both for Ti–6Al–4V thin walled structures fabricated by wire feed electron beam AM. Model results show that beam power and beam velocity combinations yielding constant melt pool cross-sectional areas also yield constant solidification cooling rates. Experimental measurements back up this finding and show roughly 20 beta grains across the width of a thin wall deposit which is consistent with an earlier study of single bead deposits, suggesting that links between melt pool geometry and beta grain size are independent of deposition geometry, with significant implications for AM process control.read more
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Additive manufacturing
TL;DR: Marshall has unique expertise in leveraging new digital tools, 3D printing, and other advanced manufacturing technologies and applying them to propulsion systems design and other aerospace materials to meet NASA mission and industry needs.
Journal ArticleDOI
The influence of additive manufacturing processing parameters on surface roughness and fatigue life
TL;DR: In this article, the processing-structure-property-performance (PSPP) relationship for varied contour processing parameters, and the resulting surface roughness features for alloy 718 fabricated using the laser powder bed fusion AM process are investigated.
Journal ArticleDOI
In-situ characterization and quantification of melt pool variation under constant input energy density in laser powder bed fusion additive manufacturing process
Qilin Guo,Cang Zhao,Minglei Qu,Lianghua Xiong,Luis I. Escano,S. Mohammad H. Hojjatzadeh,Niranjan D. Parab,Kamel Fezzaa,Wes Everhart,Tao Sun,Lianyi Chen +10 more
TL;DR: In this article, the authors report the direct observation and quantification of melt pool variation during the laser powder bed fusion (LPBF) additive manufacturing process under constant input energy density by in-situ high-speed high-energy x-ray imaging.
Journal ArticleDOI
Process planning for 8-axis robotized laser-based direct metal deposition system
TL;DR: In this article, a hybrid slicing method is developed to map the overhanging structures of a revolved part to be at a planar base, and the traditional path planning strategies are applicable to generate the tool-path for the mapped structures.
Journal ArticleDOI
Powder-based additive manufacturing – a review of types of defects, generation mechanisms, detection, property evaluation and metrology
Hossein Taheri,Mohammad Rashid Bin Mohammad Shoaib,Lucas W. Koester,Timothy A. Bigelow,Peter C. Collins,Leonard J. Bond +5 more
TL;DR: In this paper, various types of microstructural features or defects, their generation mechanisms, their effect on bulk properties and the capability of existing characterisation methodologies for powder-based AM parts are reviewed.
References
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Book
Titanium: A Technical Guide
TL;DR: In this paper, the authors provide a summary of the most useful information required to understand titanium and its alloys and present a review of the significant features of the metallurgy and application of titanium and alloys.
Journal ArticleDOI
Steady state columnar and equiaxed growth of dendrites and eutectic
TL;DR: In this article, an analysis for the growth of equiaxed grains ahead of the columnar front during directional solidification is presented, and the model considers both single-phase and eutectic growth.
Journal ArticleDOI
Microstructure and texture evolution during solidification processing of Ti–6Al–4V
P.A. Kobryn,S. L. Semiatin +1 more
TL;DR: In this article, an extensive research program was undertaken to establish the relationships between processing conditions and microstructural characteristics and to apply finite-element-method process-modeling techniques and phenomenological microstructure-evolution modeling techniques for the prediction of micro-structure during these processes.