Research Papers

Numerical Modeling of Transport Phenomena and Dendritic Growth in Laser Spot Conduction Welding of 304 Stainless Steel

[+] Author and Article Information
Wenda Tan, Neil S. Bailey, Yung C. Shin

 Center for Laser-Based Manufacturing, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Manuf. Sci. Eng 134(4), 041010 (Jul 24, 2012) (8 pages) doi:10.1115/1.4007101 History: Received March 08, 2011; Revised June 16, 2012; Published July 24, 2012; Online July 24, 2012

A multiscale model is developed to investigate the heat/mass transport and dendrite growth in laser spot conduction welding. A macroscale transient model of heat transport and fluid flow is built to study the evolution of temperature and velocity field of the molten pool. The molten pool shape is calculated and matches well with the experimental result. On the microscale level, the dendritic growth of 304 stainless steel is simulated by a novel model that has coupled the cellular automata (CA) and phase field (PF) methods. The epitaxial growth is accurately identified by defining both the grain density and dendrite arm density at the fusion line. By applying the macroscale thermal history onto the microscale calculation domain, the microstructure evolution of the entire molten pool is simulated. The predicted microstructure achieves a good quantitative agreement with the experimental results.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Experimental and simulated shape of molten pool for (a) case 1 and (b) case 3 (experimental result for case 3 is from Ref. [10])

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Figure 2

Temperature and fluid field for case 3 (benchmark simulation result is from Ref. [10])

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Figure 3

Cooling rate at the solidification front: (a) along pool surface; (b) along pool center axis

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Figure 4

Schematic explanation of decentered square algorithm

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Figure 5

Concentration distribution from cellular automata model to phase field model: (a) construction of 1D concentration profile; (b) mapping the profile to the phase field domain

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Figure 6

Microstructure near fusion line of molten pool of Al-Cu Alloy [33]

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Figure 7

Grain distribution in weld metal

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Figure 8

Dendrite morphology in case 1: (a) and (b) at the pool bottom; (c) and (d) at the pool side




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