Modeling of Induction Infrared Thermography for Non-Destructive Evaluation of Alloy Sensitization
Abstract
Modeling of Induction Infrared Thermography for Non-Destructive Evaluation of Alloy SensitizationAbstract:This two-year NURP (Navy Undersea Research Program) project aims to investigate the feasibility of using induction infrared thermography (IIRT) to detect se"nsitization in two strategic materials widely used by the Navy, namely chromium-steel and aluminum-magnesium (Al-Mg) alloys. Sensiti"zation is widely perceived to be a major issue in both types of materials. It refers to the precipitation of certain compounds ~ Cr2"3C6 in chromium-steel and Al3Mg2 in Al-Mg alloy ~ at grain boundaries due to elevated temperature, which makes the alloy susceptible"" to Environmentally Assisted Cracking (EAC), eventually causing catastrophic structural failure. Current methods for sensitization"" detection require destructive tests in a laboratory environment. In this project, the team (K. Wang and M. Roberts, Virginia Tech"" and E. Guzas, NUWC) will collaborate with a group of researchers at NUWC-Newport (POC: W. Tucker) who are currently experimentally"" investigating the feasibility of using IIRT as a non-intrusive, real-time method for sensitization detection. The basic hypothesis" is that because the sensitized regions of a material have dramatically different electrical resistivity relative to the unsensitize"d material, these regions will generate distinguishable temperature profiles under the influence of IIRT. This hypothesis is support"ed by preliminary experimental studies on chromium-steel. We propose that developing a high-fidelity IIRT model capable of predicting the heat signature of alloys of various degrees of sensitization (DOS) is much needed: it would complement these earlyexperimenta"l findings by providing a physics-based proof of the above theory, and providing a quantitative correlation between the measured IIR""T heat signature of a given alloy and its underlying DOS. Specifically, we propose to address the following specific issues: (1) the" development of a thermo-electro-magnetic model and numerical solver capable of predicting the thermal responses of chromium-steel ("440C and 316L) and Al-Mg (5086 H 32, 5083 H 116, 5456 H 116) of various DOS subjected to induction heating; (2) the quantitative val"idation of the above model by conducting standard destructive sensitization tests and non-destructive IIRT experiments; and (3) the identification of the correlation between the IIRT temperature profile and DOS. This basic research project is aligned with one of" the Undersea Weaponry Core Technology Areas, namely Corrosion and Anti-Fouling Coatings. Completion of the project will provide new"" data and knowledge that help evaluate and improve the efficacy of IIRT for sensitization detection, potentially leading to a novel," non-destructive method and tool for structural health monitoring and condition-based maintenance decisions.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Dec 20, 2017
- Source ID
- N000141812059
Entities
People
- Kevin G. Wang
Organizations
- Office of Naval Research
- United States Navy
- Virginia Tech