Numerical Simulation of a Heat-Treated Ring Gear Blank

[+] Author and Article Information
C. Mgbokwere

Scientific Research Laboratory, Ford Motor Company, Dearborn, MI 48121

M. Callabresi

MLC Technical Consultant, Livermore, CA 94550

J. Eng. Mater. Technol 122(3), 305-314 (Mar 02, 2000) (10 pages) doi:10.1115/1.482802 History: Received December 01, 1999; Revised March 02, 2000
Copyright © 2000 by ASME
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Ring gear blank used for simulation
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Heat treat process model schematic
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(a) Illustration of regions where heat transfer coefficient is applied. (b) Location of thermocouples on the gear blank.
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Two-dimensional mesh used in the simulation
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Results of the carbon diffusion analysis. (a) Carbon contour plot and (b) carbon gradient from bottom inside diameter inward.
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Optimum distribution of the ten heat transfer coefficient
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Comparison of measured and calculated time-temperature profile
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Temperature distribution at four different time intervals
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(a) Contour plot of phase volume fraction at 12.8 s. (b) Contour plot of phase volume fraction at 44.5 s. (c) Contour plot of phase volume fraction at 240 s. (d) Contour plot of phase volume fraction at 780 s.
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Contour plot of the hardness with the Rockwell C conversion in parenthesis. Also shown are four locations of the phase volume fraction at 780 s.
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Calculated phase volume fraction from the surface of the blank to the core
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Optical micrographs of center core sections (a) bottom and (b) top. The bottom microstructure is a bainite formed at a higher temperature with more ferrite than the top microstructure which consists of bainite and martensite.
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Evolution of volume fraction in the bottom core (a) and from the bottom inside surface (b) as a function of time with corresponding calculated cooling curve
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Calculated stress and temperature profile as a function of time at four different locations. (a) Stress in the longitudinal direction (b) stress in the hoop direction.
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Contour plot of stresses and plastic strain
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Comparison between computed and measured stresses. (a) Current simulation (b) previous simulation.
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Illustration of the computed and measured displacement. (a) Current simulation (b) previous simulation.




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