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Process Innovation to Eliminate Cracking Problems in Large Diameter Parts with Nonuniform Wall Thickness
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09/16/2013
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Zhichao Li and Lynn Ferguson
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Process innovation, Cracking problems, AISI 4150, Residual Stress, Microstructure, and Distortion
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Induction hardening and Spray quench
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Stress and Deformation during Induction Hardening of Tubular Products
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09/09/2012
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Lynn Ferguson, Zhichao Li, Valentin Nemkov, and Robert Goldstein
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Thick-wall tube, AISI 4340, Stress and deformation, Steel Distortion, Electromagnetic and Thermal Analysis, Microstructure, and Residual Stress
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Induction hardening, Spray quenching, Scanning Induction, and Single Shot Induction
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Modeling the Effect of Carburization and Quenching on the Development of Residual Stresses and Bending Fatigue Resistance of Steel Gears
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07/24/2012
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Zhichao Li, Andrew M. Freborg, Bruce D. Hansen, and T.S. Srivatsan
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bending fatigue, carburized Pyrowear 53 gear, residual stress, process modeling, single tooth bending load model, and dynamic contact stress analysis
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low pressure carburization, oil quench hardening, cryogenic treatment/deep freeze, and double temper
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Assessing Heat Treatment Distortion Sensitivity
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09/17/2007
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Andrew Freborg, Zhichao Li, and Lynn Ferguson
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Distortion sensitivity, Process sensitivity, Hardness Profile, Residual Stress Profile, Microstructure, and Pyrowear 53 Steel
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Carburization, Austenitizing, Intensive quench, Oil quench, and Deep freeze
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Bending Fatigue Strength Improvement of Carburized Gears
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05/09/2006
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A. M. Freborg, B. L. Ferguson, Z. Li, D. X. Schwam, and B. J. Smith
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bending fatigue strength, carburized aerospace gears, Pyrowear 53, residual stress measurement/validation, model validation, physical characterization, bending fatigue performance, loading model, hardness profile measurement, and single tooth bending fatigue
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carburizing, oil quench, intensive quench, deep freeze, and temper
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Experiment and Simulation of Heat Treatment Results of C-Ring Test Specimen
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01/01/2006
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Zhichao Li, B. Lynn Ferguson, Xichen Sun, and Peter Bauerle
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Carburized AISI 8620 steel, C-Ring test specimen, model validation, residual stress measurement, carbon profile prediction, hardness profile prediction, residual stress prediction, carbon profile measurement, hardness profile measurement, and phase transformation prediction
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gas carburization, oil quench, and temper
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