Transcript
Gas quenching of CARBURIZED PINION GEAR
• Prediction of Carbon profile• Determination of Heat Transfer Coefficients• Prediction of Quenched residual Stress State, Metallurgical Phase
distribution & Hardness Profile• Prediction of distortion
Upwind Technology Inc.6660 Cobb DriveSterling heights, MI 48033586-977-1967
Top zone surface
Middle zone surface
Bottom zone surface
Total number of nodes = 22440
Total number of elements = 19890
The single tooth is divided into three zones. Different heat transfer coefficients are applied on individual zones.
Top zone surface
Middle zone surface
Bottom zone surface
The ambient temperature vs. time was taken from experiments
Temperature vs. time from thermocouples for each zone were used as the baseline for fitting
Because gas quenching was performed, a constant heat transfer coefficient value was assumed for each zone. Iteration to determine appropriate heat transfer values for the three zones was automated using an optimization methodology.
Fitted Heat Transfer Coefficients
Agreement between measured and predicted temperature-time is acceptable for these heat transfer coefficient values.
Predicted Minimum Principal Stress
Unit (mpa)
AUSTENITE FERRITE
U BAINITE
L BAINITE MARTENSITE
Hardness Distribution
Radial distortion contour plot using the local cylindrical coordinate system
Radial displacement, 0.0213 mm
Radial displacement, 0.121 mm
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