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Research Papers

Multiscale, Heterogeneous Computer Aided Design Representation for Metal Alloy Microstructures

[+] Author and Article Information
David W. Rosen

Georgia Institute of Technology,
School of Mechanical Engineering,
813 Ferst Drive,
Atlanta, GA 30332-0405
e-mail: david.rosen@me.gatech.edu

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING. Manuscript received March 26, 2014; final manuscript received May 1, 2014; published online September 1, 2014. Editor: Bahram Ravani.

J. Comput. Inf. Sci. Eng 14(4), 041003 (Sep 01, 2014) (8 pages) Paper No: JCISE-14-1097; doi: 10.1115/1.4028196 History: Received March 26, 2014; Revised May 01, 2014

Most heterogeneous computer aided design (CAD) representations in the literature represent materials using a volume fraction vector, which may not by physically realizable or meaningful. In contrast, the multiscale, heterogeneous CAD representation presented here models materials using their microstructure. For the specific metal alloys of interest in this work, the material model is a probabilistic model of grain characteristics, represented as cumulative distribution functions (CDFs). Several microstructure reconstruction algorithms are presented that enable different alloy grain structures to be reconstructed in a part model. Reconstructions can be performed at any desired size scale, illustrating the multiscale capability of the representation. A part rendering algorithm is presented for displaying parts with their material microstructures. The multiscale, heterogeneous CAD representation is demonstrated on two Inconel alloys and is shown to be capable of faithfully reconstructing part representations consistent with the probabilistic grain models.

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References

Figures

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Fig. 1

IN-100 voxel dataset

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Fig. 2

Results of reconstruction steps: (a) steps 1 and 2, with ellipses and 250 sample points, (b) Voronoi diagram of sample points, (c) reconstructed grains (141 grains), and (d) combined grains (101 grains)

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Fig. 8

Example Inconel 625 part with two locations identified (dimensions in mm)

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Fig. 9

Inconel 625 reconstruction at location 1: (a) reconstruction with zoom region indicated and (b) zoom-in of reconstruction

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Fig. 6

CDFs for grain aspect ratios

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Fig. 7

Inconel 625 microstructure, hot deformed at 1150   °C and strain of 0.3

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Fig. 10

Inconel 625 reconstruction at location 2: (a) reconstruction with zoom region indicated and (b) zoom-in of reconstruction

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Fig. 3

Part for example 1 with region indicated (dimensions in mm)

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Fig. 4

Microstructure reconstruction near part corner at two zoom settings (dimensions in μm)

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Fig. 5

CDFs for grain length

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