Measurements of degree of sensitization (DoS) in aluminum alloys using EMAT ultrasound

Li, Fang; Xiang, Dan; Qin, Yexian; Pond, R. B.; Slusarski, Kyle

doi:10.1016/j.ultras.2010.12.009

Cited by 34 publications

(8 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electromagnetic acoustic transducer is a non-contact type (does not require contact or couplant); an ultrasonic NDT instrument measures ultrasonic velocity and attenuation. It is reported that ultrasonic velocity information did not reveal about DoS and shear velocity, and attenuation revealed DoS in AA5XXX aluminum alloy [108]. The same was observed for 304 stainless steel [109].…”

Section: Evaluation Of Sensitization: Emerging Methodsmentioning

confidence: 79%

Sensitization of Austenitic Stainless Steels: Current Developments, Trends, and Future Directions

Srinivasan

2021

Metallogr. Microstruct. Anal.

View full text Add to dashboard Cite

In this manuscript, the latest developments pertaining to sensitization are discussed. Sensitization leads to intergranular corrosion and intergranular stress corrosion cracking. The advantages and disadvantages of conventional methods to combat sensitization are elaborated. Emerging/newer techniques such as grain boundary engineering, creation of orientation gradients, and high density of twinning to improve resistance to sensitization are also covered. Detection and monitoring of deleterious phase precipitation such as carbides, nitrides, and other intermetallic phases during operation necessitate making use of nondestructive testing (NDT) methods. Possible information that we get from NDT is for material characterization includes the size, shape, and location of a defect. Herein, the significant developments for monitoring and detection of phases concerning sensitization by NDT are discussed. These range from magnetic methods to ultrasonic techniques. The multi-physics approach is essential to fully utilize NDT to ensure/predict the lifetime of the components used in the industry. Further, proper selection of suitable NDT for defect detection can avert accidents, catastrophic failures, and economic losses due to corrosion degradation. For this, the corrosion engineer/corrosionist properly apply the suitable techniques (prevention, monitoring, and assessment) to address the issues of sensitization among the wide choice available.

show abstract

Section: Evaluation Of Sensitization: Emerging Methodsmentioning

confidence: 79%

Sensitization of Austenitic Stainless Steels: Current Developments, Trends, and Future Directions

Srinivasan

2021

Metallogr. Microstruct. Anal.

View full text Add to dashboard Cite

show abstract

“…In addition, for AA5456-H116, the expected shift in DoS is insignificant, typically ranging from 15 mg/cm 2 to 70 mg/cm 2 . The DoS shift can be less than 5 mg/cm 2 after more than 1,000 hours of heat exposure [6][7][8] . Therefore, a measurement technique that is non-destructive and highly sensitive to minute changes is called for.…”

Section: Introductionmentioning

confidence: 96%

“…However, the β-phase Al2Mg3 particles will precipitate at the grain boundaries when the material is subjected to prolonged heat exposure at temperatures above 60˚C, leading to sensitization. This makes AA5456-H116 highly vulnerable to intergranular corrosion and stress corrosion cracking [6][7][8] . The standard method for measuring sensitization is the nitric acid mass loss test (NAMLT), which immerses the sensitized test specimens in concentrated nitric acid (71 wt.%) at 30˚C for 24 hours.…”

Section: Introductionmentioning

confidence: 99%

“…Various methods have been developed, demonstrating a heightened interest in and urgent need for it. The widely used approaches include direct visual measurement 12,13 , induction infrared thermography 14 , eddy current testing 15,16 , and ultrasound methods 6,17 . The direct visual measurements use scanning electron microscopy and/or transmission electron microscopy to investigate the size of the β-phase and its growth process.…”

Section: Introductionmentioning

confidence: 99%

“…Another prominent NDE approach for sensitization detection is the ultrasound method. L. Fang and C. Chukwunonye generated narrow-band shear and longitudinal ultrasound below 3 MHz using electromagnetic acoustic transducer or piezoelectric acoustic transducer, respectively 6,17 . They confirmed in part that the attenuation of ultrasound is responsive to the sensitization processes that occur during heat treatment in high-magnesium aluminum alloy.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sensitization detection of aluminum alloy plates using laser-generated longitudinal waves

Wang

Abusoua

Huang

2023

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2023

View full text Add to dashboard Cite

Sensitization refers to the formation of magnesium precipitates at the grain boundaries when Al-Mg alloy is exposed to elevated temperatures for extended periods of time, which can lead to reduced corrosion resistance and increased susceptibility to stress corrosion cracking. Since sensitization occurs at the microstructure level, a measurement technique that can measure multiple locations rapidly and is highly sensitive to minute changes is called for. This paper explores laser-generated longitudinal ultrasonic guided waves for sensitization detection in aluminum alloy plates. The samples were heat-treated to induce sensitization, and the degree of sensitization was determined by the nitric acid mass loss tests. The longitudinal ultrasonic guided waves were generated using a high-power pulsed free-space laser and detected using a continuous fiber laser. A digital signal processing algorithm has been developed to analyze the timefrequency components of the acquired signal. The experimental results demonstrated that the state of sensitization can be characterized by ultrasound parameters, such as attenuation.

show abstract

Intelligent Structural Health Monitoring with Ultrasonic Lamb Waves

Hinders

Miller

2020

Intelligent Feature Selection for Machine Learning Using the Dynamic Wavelet Fingerprint

View full text Add to dashboard Cite

Measurements of degree of sensitization (DoS) in aluminum alloys using EMAT ultrasound

Cited by 34 publications

References 9 publications

Sensitization of Austenitic Stainless Steels: Current Developments, Trends, and Future Directions

Sensitization of Austenitic Stainless Steels: Current Developments, Trends, and Future Directions

Sensitization detection of aluminum alloy plates using laser-generated longitudinal waves

Intelligent Structural Health Monitoring with Ultrasonic Lamb Waves

Contact Info

Product

Resources

About