Research Programs

Control of Distortion and Residual Stress in Heat Treated Components

Research Team:
Robert Foley
Philip Nash
T. Calvin Tszeng
Guofang Zhou

Identify and prioritize factors influencing distortion and identify those, which are controllable in the heat treat process.
Identify and quantify the necessary inputs for a computer model.
Demonstrate current modeling capabilities with FEM simulations and with experiments.
Identify the sensitivity of distortion and residual stresses to variations in the input parameters.
Correlate quenchant performance with the characterization results.
Provide industry members with tools for prediction/control of distortion and residual stresses.

Perform literature search and poll members on factors considered to affect distortion. Prioritize and weigh factors controllable through the heat treatment process.
Determine the factors needed for input to computer prediction models and whether or not adequate data are available.
Determine experimentally the necessary data for computer models for the two materials to be studied in this project, IN718 and 4142 steel.
Perform sensitivity analysis using computer model to determine the distortion and residual stress variations caused by various factors.
Validate model through measurements of distortion and residual stress for the two materials in their specific geometry.
Collaborate with the quenchant project at WPI to correlate quenchant performance with our characterization results.
Synthesize the experimental and modeling results into useable tools for control of distortion and residual stress.

APPENDIX A - Neutron Diffraction Measurement of Oil Quenched 4142 Tube

APPENDIX B - High Temperature Mechanical Property Sensitivity

APPENDIX C - Web-based Database (Hotpoint and SysWeld)

APPENDIX D -FEM Calculation for AISI 4142 Tube

Full Report is available to CHTE members; Contact dapelian@wpi.edu, or mpi@wpi.edu.

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Last modified: September 07, 2007 11:04:55