Modeling of the Effect of Path Planning on Thermokinetic Evolutions in Laser Powder Deposition Process |
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Authors: | Ehsan Foroozmehr Radovan Kovacevic |
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Affiliation: | (1) Center for Laser Aided Manufacturing (CLAM), Southern Methodist University, Dallas, TX 75275, USA;(2) Present address: Rapid Prototyping Laboratory, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada; |
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Abstract: | A thermokinetic model coupling finite-element heat transfer with transformation kinetics is developed to determine the effect
of deposition patterns on the phase-transformation kinetics of laser powder deposition (LPD) process of a hot-work tool steel.
The finite-element model is used to define the temperature history of the process used in an empirical-based kinetic model
to analyze the tempering effect of the heating and cooling cycles of the deposition process. An area is defined to be covered
by AISI H13 on a substrate of AISI 1018 with three different deposition patterns: one section, two section, and three section.
The two-section pattern divides the area of the one-section pattern into two sections, and the three-section pattern divides
that area into three sections. The results show that dividing the area under deposition into smaller areas can influence the
phase transformation kinetics of the process and, consequently, change the final hardness of the deposited material. The two-section
pattern shows a higher average hardness than the one-section pattern, and the three-section pattern shows a fully hardened
surface without significant tempered zones of low hardness. To verify the results, a microhardness test and scanning electron
microscope were used. |
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