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Nondestructive Evaluation of Residual Stress in Shot Peened Inconel Using Ultrasonic Minimum Reflection Measurement.
Yeong-Won Choi1, Taek-Gyu Lee2, Yun-Taek Yeom3
1School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea.
Materials (Basel, Switzerland)
|July 29, 2023
Summary
Ultrasonic minimum reflectivity measurements offer a safe and cost-effective method for evaluating residual stresses in INCONEL 718. This technique provides accurate stress depth profiles, comparable to traditional X-ray diffraction methods.
Area of Science:
- Materials Science
- Non-destructive Testing
- Mechanical Engineering
Background:
- Nickel-based superalloys like INCONEL are critical in aerospace and nuclear applications due to their high strength and resistance.
- Shot peening induces residual stresses to enhance material properties, necessitating accurate measurement techniques.
- Traditional methods like X-ray diffraction (XRD) for residual stress measurement are accurate but destructive and pose safety risks.
Purpose of the Study:
- To evaluate the effectiveness of ultrasonic minimum reflectivity measurements for assessing residual stresses in INCONEL 718.
- To develop an estimation equation for predicting residual stress distribution with depth using ultrasonic data.
- To compare the accuracy of the ultrasonic method with the established XRD technique.
Main Methods:
- Utilized ultrasonic minimum reflectivity measurements employing Rayleigh waves to probe INCONEL 718 specimens.
- Developed and solved an optimization problem using exponential functions to establish a residual stress depth profile equation.
- Validated the ultrasonic method by comparing its results with residual stress measurements obtained via X-ray diffraction (XRD).
Main Results:
- Ultrasonic minimum reflectivity measurements successfully evaluated residual stresses in INCONEL 718.
- An exponential function-based equation was derived to estimate residual stress distribution with depth.
- The ultrasonic method demonstrated comparable results to the destructive XRD technique, validating its efficacy.
Conclusions:
- Ultrasonic minimum reflectivity measurement is a viable, non-destructive alternative for residual stress evaluation in INCONEL 718.
- The developed estimation equation allows for depth-dependent residual stress profiling.
- This ultrasonic approach offers a safer, faster, and more cost-effective solution compared to traditional methods.
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