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TECHNICAL PAPERS

Simulating Distortion and Residual Stresses in Carburized Thin Strips

[+] Author and Article Information
V. C. Prantil, M. L. Callabresi, J. F. Lathrop

Sandia National Laboratories, Livermore, CA 94551-0969

G. S. Ramaswamy

The General Electric Company, Niskayuna, NY 12309

M. T. Lusk

Colorado School of Mines, Golden, CO 80401

J. Eng. Mater. Technol 125(2), 116-124 (Apr 04, 2003) (9 pages) doi:10.1115/1.1543973 History: Received September 28, 1999; Revised September 18, 2000; Online April 04, 2003
Copyright © 2003 by ASME
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References

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Figures

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Almen strip geometry (a) and illustration of the carbon gradient through the thickness (b)
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Distortion of Almen strip set as a function of strip thickness from 5. The top (convex) surface of the strip is the carburized surface.
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Heat treatment schedule for the experimental Almen samples
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Uncoupled analyses available within the NCMS heat treatment process model
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Mechanical response data (points) for 4120 austenite at 850°C along with model fit (solid lines) using the multiphase state variable plasticity model for 0.2 weight % carbon
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Mechanical response data (points) for 4120 martensite at a strain rate of 0.001 s−1 along with model fits (solid lines) using the multiphase state variable plasticity model for 0.2 weight % carbon
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Thermal and phase transformation dilatational strains on cooling for low carbon steel alloys. Axial contraction is referenced arbitrarily to zero at 840°C and plotted as the ordinate.
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Linear transformation strains for martensite formation on cooling for low carbon steel alloys
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Comparison of the Weibull parameterization for TRIP with the previous formulation and experiments reported by Leblond
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Schematic indicating the shifting of the equilibrium volume fraction of martensite as a function of temperature
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Comparison of theory and experiment for martensite formation in low carbon steels. Predicted volume fractions (solid lines) compare well with experimental data (points).
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Comparison of experimental data with the new kinetics (DANTE) model prediction and the prediction of the Koistinen-Marburger (K-M) equation
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Almen strip carbon profile with depth from the carburized surface for h =1.30 mm
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Almen strip carbon profile with depth from the carburized surface for h =3.18 mm
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Transverse distortion of Almen strip as a function of strip thickness
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Predicted Almen strip transverse deflection histories. Initial deflections result from carburization.
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In-plane residual stress depth profile at the center of the 2.44 mm thick Almen strip. Predicted stresses (solid lines) compare well with X-ray measurements (points) from Larson 5.
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In-plane residual stress depth profile at the center of the 3.18 mm thick Almen strip. Predicted stresses (solid lines) compare well with X-ray measurements (points) from Larson 5.

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