Journal ArticleDOI
A two-dimensional transient model for convection in laser melted pool
C. Chan,J. Mazumder,M. M. Chen +2 more
TLDR
In this paper, a two-dimensional transient model for convective heat transfer and surface tension driven fluid flow is developed, which describes the transient behavior of the heat transfer process of a stationary band source.Abstract:
A two-dimensional transient model for convective heat transfer and surface tension driven fluid flow is developed. The model describes the transient behavior of the heat transfer process of a stationary band source. Semi-quantitative understanding of scanning is obtained by a coordinate transformation. The non-dimensional forms of the equations are derived and four dimensionless parameters are identified, namely, Peclet number (Pe), Prandtl number (Pr), surface tension number(S), and dimensionless melting temperature(@#@ Tm
*
@#@). Their governing characteristics and their effects on pool shape, cooling rate, velocity field, and solute redistribution are discussed. A numerical solution is obtained and presented. Quantitative effects of Prandtl number and surface tension number on surface velocity, surface temperature, pool shape, and cooling rate are presented graphically.read more
Citations
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Journal ArticleDOI
Second-order accurate volume-of-fluid algorithms for tracking material interfaces
TL;DR: A design criteria for a volume-of-fluid interface reconstruction algorithm to be second-order accurate is proposed, which is that it reproduce lines in two space dimensions or planes in three space dimensions exactly.
Journal ArticleDOI
A High-Order Projection Method for Tracking Fluid Interfaces in Variable Density Incompressible Flows
TL;DR: In this paper, the authors present a numerical method for computing solutions of the incompressible Euler or Navier?Stokes equations when a principal feature of the flow is the presence of an interface between two fluids with different fluid properties.
Journal ArticleDOI
Real-time monitoring of laser powder bed fusion process using high-speed X-ray imaging and diffraction
Cang Zhao,Kamel Fezzaa,Ross B. Cunningham,Haidan Wen,Francesco De Carlo,Lianyi Chen,Anthony D. Rollett,Tao Sun +7 more
TL;DR: The high-speed synchrotron hard X-ray imaging and diffraction techniques used to monitor the laser powder bed fusion (LPBF) process of Ti-6Al-4V in situ and in real time demonstrate that many scientifically and technologically significant phenomena in LPBF, including melt pool dynamics, powder ejection, rapid solidification, and phase transformation, can be probed with unprecedented spatial and temporal resolutions.
Journal ArticleDOI
Modelling of microstructure formation in solidification processes
TL;DR: In this paper, the authors introduce the basic concepts of macroscopic and microscopic phenomena which enter normally into any solidification process, and the latest developments in numerical techniques which are used to solve the continuity equations are briefly presented together with the advantages and inconvenience.
Journal ArticleDOI
Physical processes in fusion welding
Tarasankar Debroy,Stan A David +1 more
TL;DR: In recent years, major advances have taken place in our understanding of welding processes and welded materials because of the complexity of fusion welding processes, solution of many important contemporary problems in fusion welding requires an interdisciplinary approach as mentioned in this paper.
References
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ReportDOI
SOLA: a numerical solution algorithm for transient fluid flows
TL;DR: In this article, a finite difference technique is presented for solving the Navier-Stokes equations for an incompressible fluid, based on the Marker-and-Cell method, to facilitate its use by persons with little or no experience in numerical fluid dynamics.
Journal ArticleDOI
Surface rippling induced by surface‐tension gradients during laser surface melting and alloying
T. R. Anthony,H. E. Cline +1 more
TL;DR: In this article, surface tension gradients on the melt surface between the laser-beam impact point and the intersection line of the solid-liquid interface with the surface generate surface-tension gradients that sweep liquid away from beam impact point.
Journal ArticleDOI
Mass transport in laser surface alloying: iron-nickel system.
T. Chande,Jyoti Mazumder +1 more
TL;DR: The role of fluid flow in producing uniformly alloyed beads in laser surface alloying is examined and the experimental finding that the uniformity of alloying increased with a decrease in the beam diameter is analyzed as discussed by the authors.
Journal ArticleDOI
Composition control in laser surface alloying
T. Chande,Jyoti Mazumder +1 more
TL;DR: In this paper, the results of an initial systematic study of laser surface alloying nickel onto AISI 1020 steel substrates using a statistical experimental design technique were reported, where processing conditions were related to dimensions, solute content, and microstructural refinement of the laser alloyed zones.