Ji, Chenglong
(2018)
Corrosion Evaluation of Additive Manufacture Metal Alloy by Nondestructive Line-Focused Transducer.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
In this study, the elastic properties of the additive manufactured and the traditional manufactured standard sample of stainless steel – grade 420 (SS420) before and after the electrochemical corrosion will be characterized by using the line-focused ultrasonic transducer system. The calculation was based on the measurement of the surface Rayleigh wave’s velocity. The result showed that the velocity of the surface wave and Young’s modulus had a negative correlation with the degree of corrosion, which means as the degree of the corrosion became severer, the velocity of the surface wave and Young’s modulus decreased. A galvanic cell to simulate the electrochemical corrosion in this test was established and a concave transducer with a motorized stage was used to emit and detect the ultrasonic waves which could be used in surface wave’s calculation.
This thesis research includes four parts: 1) theoretical consideration of the surface wave propagating and the elastic constants in an isotropic material; 2) basic principles and procedures of the measurement regarding the surface Rayleigh wave and the corrosion evaluation; 3) data processing and the result of Young’s modulus variation with regards to the corrosion; 4) the conclusions about this experiment and some future expectations.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| Date: |
24 January 2018 |
| Date Type: |
Publication |
| Defense Date: |
17 November 2017 |
| Approval Date: |
24 January 2018 |
| Submission Date: |
15 November 2017 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
63 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Mechanical Engineering |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
corrosion evaluation, nondestructive test, line-focused transducer, surface Rayleigh wave |
| Date Deposited: |
24 Jan 2018 19:50 |
| Last Modified: |
24 Jan 2018 19:50 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/33367 |
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