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Modeling of the Effect of Path Planning on Thermokinetic Evolutions in Laser Powder Deposition Process

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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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Acknowledgments

The authors would like to thank Dr. Rouzbeh Sarrafi, Research Engineer in the Center for Laser Aided Manufacturing, for his valuable comments on this study. This work was supported partially by Grant EEC-0541952 from the National Science Foundation.

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Author notes

  1. Ehsan Foroozmehr (PhD Candidate, Postdoctoral Fellow)

    Present address: Rapid Prototyping Laboratory, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada

Authors and Affiliations

  1. Center for Laser Aided Manufacturing (CLAM), Southern Methodist University, Dallas, TX, 75275, USA

    Ehsan Foroozmehr (PhD Candidate, Postdoctoral Fellow) & Radovan Kovacevic (Director)

Authors
  1. Ehsan Foroozmehr
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  2. Radovan Kovacevic
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Corresponding author

Correspondence to Radovan Kovacevic.

Additional information

Manuscript submitted October 29, 2009.

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Foroozmehr, E., Kovacevic, R. Modeling of the Effect of Path Planning on Thermokinetic Evolutions in Laser Powder Deposition Process. Metall Mater Trans A 42, 1907–1918 (2011). https://doi.org/10.1007/s11661-010-0561-3

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