Nonlinear ultrasonic technique for the characterization of microstructure in additive materials
Abstract
This study employs nonlinear ultrasonic techniques to track microstructural changes in additively manufactured metals. The second harmonic generation technique based on the transmission of Rayleigh surface waves is used to measure the acoustic nonlinearity parameter, β. Stainless steel specimens are made through three procedures: traditional wrought manufacturing, laser-powder bed fusion, and laser engineered net shaping. The β parameter is measured through successive steps of an annealing heat treatment intended to decrease dislocation density. Dislocation density is known to be sensitive to manufacturing variables. In agreement with fundamental material models for the dislocation-acoustic nonlinearity relationship in the second harmonic generation, β drops in each specimen throughout the heat treatment before recrystallization. Geometrically necessary dislocations (GNDs) are measured from electron back-scatter diffraction as a quantitative indicator of dislocations; average GND density and β are found to have a statistical correlation coefficient of 0.852 showing the sensitivity of β to dislocations in additively manufactured metals. Moreover, β shows an excellent correlation with hardness, which is a measure of the macroscopic effect of dislocations.
- Authors:
-
[1];
[2];
[3];
[3];
[1]
- Georgia Institute of Technology, Atlanta, GA (United States). George W. Woodruff School of Mechanical Engineering
- Georgia Institute of Technology, Atlanta, GA (United States). School of Civil and Environmental Engineering
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1738935
- Alternate Identifier(s):
- OSTI ID: 1756122
- Report Number(s):
- SAND-2020-13843J
Journal ID: ISSN 0001-4966; 692969
- Grant/Contract Number:
- AC04-94AL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the Acoustical Society of America
- Additional Journal Information:
- Journal Volume: 149; Journal Issue: 1; Journal ID: ISSN 0001-4966
- Publisher:
- Acoustical Society of America
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING
Citation Formats
Bellotti, Aurelio, Kim, Jin-Yeon, Bishop, Joseph E., Jared, Bradley H., Johnson, Kyle, Susan, Donald, Noell, Philip J., and Jacobs, Laurence J. Nonlinear ultrasonic technique for the characterization of microstructure in additive materials. United States: N. p., 2021.
Web. doi:10.1121/10.0002960.
Bellotti, Aurelio, Kim, Jin-Yeon, Bishop, Joseph E., Jared, Bradley H., Johnson, Kyle, Susan, Donald, Noell, Philip J., & Jacobs, Laurence J. Nonlinear ultrasonic technique for the characterization of microstructure in additive materials. United States. https://doi.org/10.1121/10.0002960
Bellotti, Aurelio, Kim, Jin-Yeon, Bishop, Joseph E., Jared, Bradley H., Johnson, Kyle, Susan, Donald, Noell, Philip J., and Jacobs, Laurence J. Thu .
"Nonlinear ultrasonic technique for the characterization of microstructure in additive materials". United States. https://doi.org/10.1121/10.0002960. https://www.osti.gov/servlets/purl/1738935.
@article{osti_1738935,
title = {Nonlinear ultrasonic technique for the characterization of microstructure in additive materials},
author = {Bellotti, Aurelio and Kim, Jin-Yeon and Bishop, Joseph E. and Jared, Bradley H. and Johnson, Kyle and Susan, Donald and Noell, Philip J. and Jacobs, Laurence J.},
abstractNote = {This study employs nonlinear ultrasonic techniques to track microstructural changes in additively manufactured metals. The second harmonic generation technique based on the transmission of Rayleigh surface waves is used to measure the acoustic nonlinearity parameter, β. Stainless steel specimens are made through three procedures: traditional wrought manufacturing, laser-powder bed fusion, and laser engineered net shaping. The β parameter is measured through successive steps of an annealing heat treatment intended to decrease dislocation density. Dislocation density is known to be sensitive to manufacturing variables. In agreement with fundamental material models for the dislocation-acoustic nonlinearity relationship in the second harmonic generation, β drops in each specimen throughout the heat treatment before recrystallization. Geometrically necessary dislocations (GNDs) are measured from electron back-scatter diffraction as a quantitative indicator of dislocations; average GND density and β are found to have a statistical correlation coefficient of 0.852 showing the sensitivity of β to dislocations in additively manufactured metals. Moreover, β shows an excellent correlation with hardness, which is a measure of the macroscopic effect of dislocations.},
doi = {10.1121/10.0002960},
journal = {Journal of the Acoustical Society of America},
number = 1,
volume = 149,
place = {United States},
year = {Thu Jan 07 00:00:00 EST 2021},
month = {Thu Jan 07 00:00:00 EST 2021}
}
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