Showing papers by "Tarasankar Debroy published in 2018"
TL;DR: A review of the emerging research on additive manufacturing of metallic materials is provided in this article, which provides a comprehensive overview of the physical processes and the underlying science of metallurgical structure and properties of the deposited parts.
4,192 citations
TL;DR: In this paper, the most important metallurgical variables that affect the structure and properties of components produced by powder bed fusion are examined using a model, proposed and validated in part-I of this paper.
154 citations
TL;DR: In this paper, the authors developed and tested a three-dimensional, transient, heat transfer and fluid flow model to calculate temperature and velocity fields, build shape and size, cooling rates and the solidification parameters during PBF process.
121 citations
TL;DR: In this article, a numerical heat transfer and fluid flow model for the laser powder bed fusion (PBF) additive manufacturing (AM) was proposed to predict and prevent improper fusion among layers and hatches.
118 citations
TL;DR: In this article, the authors developed, tested and utilized a three-dimensional heat transfer and fluid flow model of wire arc additive manufacturing (WAAM) to calculate temperature and velocity fields, deposit shape and size, cooling rates and solidification parameters.
112 citations
TL;DR: The role of cooling rate, microstructure, alloy composition and post process heat treatment on the hardness of additively manufactured aluminum, nickel, titanium and iron base components is examined to understand the relative roles of manufacturing processes.
Abstract: The rapidly evolving field of additive manufacturing requires a periodic assessment of the progress made in understanding the properties of metallic components. Although extensive research has been undertaken by many investigators, the data on properties such as hardness from individual publications are often fragmented. When these published data are critically reviewed, several important insights that cannot be obtained from individual papers become apparent. We examine the role of cooling rate, microstructure, alloy composition and post process heat treatment on the hardness of additively manufactured aluminum, nickel, titanium and iron base components. Hardness data for steels and aluminum alloys processed by additive manufacturing and welding are compared to understand the relative roles of manufacturing processes. Furthermore, the findings are useful to determine if a target hardness is easily attainable either by adjusting AM process variables or through appropriate alloy selection.
92 citations
TL;DR: In this paper, the authors developed, validated and utilized a thermo-mechanical model to provide a definitive way to additively manufacture sound graded joints for minimizing abrupt changes in residual stresses and distortion of the dissimilar joints.
83 citations
TL;DR: In this paper, double pulsed (DP) gas metal arc welding (GMAW) is used to adjust the average cooling rate without changing the heat input, and the effect of current amplitude on the fusion zone geometry, cooling rates, solidification parameters, and grain size is investigated.
37 citations
TL;DR: In this paper, a U6wt%Nb uranium alloy was used for laser welding with welding speeds from 20 to 2500 mm/s and the ratio of weld length relative to depth and width increased, with melt pool lengths being more than 5 times greater than the width and 10 times higher than the depth at the highest speeds.
6 citations