scholarly journals A Review on the Applications of Acoustic Emission Technique in the Study of Stress Corrosion Cracking

2020 ◽  
Vol 2 (1) ◽  
pp. 1-33
Author(s):  
Luigi Calabrese ◽  
Edoardo Proverbio
Keyword(s):  
Acoustic Emission ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Future Trend ◽  
Corrosion Cracking ◽  
In Situ Monitoring ◽  
Localized Corrosion ◽  
Complex Nature ◽  
Damage Propagation ◽  
Research Activities

The complex nature of the damage evolution in stress corrosion cracking (SCC) leads to explore for new investigation technologies in order to better identify the mechanisms that supervise the initiation and evolution of the damage as well to provide an improvement of knowledge on this critical localized corrosion form during time. Research activities concerning the use of acoustic emission (AE) technique to assess SCC has acquiring considerably relevance in recent decades. The non-invasiveness and the possibility to provide a continuous in situ monitoring of structures and components make this non-destructive technique clearly promising in the field of structural health monitoring. In this concern, this paper aims to be a focused overview on the evaluation of SCC phenomena by AE technique. The main topic of this review is centered on the approaches that can be used in elaborating AE data to better discriminate the mechanisms that contribute to damage propagation in SCC conditions. Based on available literature, investigation approaches assessing AE waveform parameters were classified, evidencing, furthermore, the identified mechanisms that synergistically take place during the material degradation. Eventually, a brief summary and a future trend evaluation was also reported.

Effect of Long-Term Service Exposure on the Localized Corrosion and Stress Corrosion Cracking Susceptibility of Type 347 Stainless Steel

CORROSION ◽  
10.5006/2612 ◽  
2017 ◽  
Vol 74 (3) ◽  
pp. 350-361 ◽  
Author(s):  
K. Ravindranath ◽  
N. Tanoli ◽  
B. Al-Wakaa
Keyword(s):  
Stainless Steel ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Localized Corrosion ◽  
X Ray Diffraction ◽  
Degree Of Sensitization ◽  
Corrosion Susceptibility ◽  
Service Exposure

The paper presents the results of a study conducted on the effects of long-term service exposure of Type 347 stainless steel (SS) on the microstructure and corrosion susceptibility. The material subjected to the study was in service in a petroleum refinery as heater tube at 620°C for 31 years. The microscopic and x-ray diffraction studies of the service-exposed specimen revealed the precipitation of chromium-rich carbides along the grain boundaries. The microstructural changes that occurred as a result of service exposure affected the ductility and toughness of the alloy. The sensitization of the alloy was assessed by scanning electron microscopy and double loop electrochemical potentiodynamic reactivation. The studies have indicated some degree of sensitization in the alloy. The service exposure resulted in a marginal increase in the susceptibility of Type 347 SS to pitting in environments containing NaCl and NaCl + H2S. Environments such as H2SO4 and K2S4O6 at the tested concentrations did not differentiate between service-exposed and solution annealed specimens for their corrosion susceptibility. Slow strain rate testing of Type 347 SS in both the service-exposed and solution annealed conditions showed susceptibility to stress corrosion cracking in environment containing NaCl + H2S, while the alloy did not show susceptibility to SCC in H2SO4 and K2S4O6. The long-term service exposure did not noticeably influence the SCC susceptibility of Type 347 SS under the tested conditions.

scholarly journals Detection of External Stress Corrosion Cracking by Acoustic Emission

2005 ◽  
Vol 54 (7) ◽  
pp. 329-336 ◽  
Author(s):  
Akio Yonezu ◽  
Sinichi Ito ◽  
Koichi Morofuji ◽  
Shoichi Sato ◽  
Hideo Cho ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
External Stress

Simultaneous Monitoring of Acoustic Emission and Corrosion Potential Fluctuation for Mechanistic Study of Chloride Stress Corrosion Cracking

2006 ◽  
Vol 321-323 ◽  
pp. 254-259 ◽  
Author(s):  
Akio Yonezu ◽  
Hideo Cho ◽  
Takeshi Ogawa ◽  
Mikio Takemoto
Keyword(s):  
Acoustic Emission ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Potential ◽  
Corrosion Cracking ◽  
Type I ◽  
Type Ii ◽  
Potential Fluctuation ◽  
Frequency Components ◽  
Chloride Stress Corrosion Cracking

Both the acoustic emission (AE) and corrosion potential fluctuation were monitored for chloride stress corrosion cracking (SCC) of sensitized Type-304 stainless steel plate under bi-axial stress states. Branched SCCs were produced from rectangular-shaped corrosion pits initiated by falling-off of surface grains and filled with chromium oxide in 30mass% MgCl2 solution (363K). Both the AE and potential fluctuation were simultaneously detected during pit formation and SCC growth. Two types of AE (Type-I and Type-II) were monitored. Type-I AEs with higher frequency components were detected during the pit growth and supposed to be produced by falling-off of surface grains due to intergranular attack, while a number of Type-II AEs (approximately 12,500 counts) with low frequency components were detected during SCC propagation and supposed to be produced by cracking of the chromium oxy-hydroxides. Though the AEs detected during SCC test are not always the primary AEs from the SCC itself, secondary AEs can be usefully utilized to monitor the SCC initiation and propagation as well as the corrosion potential fluctuation.

scholarly journals Quantitative analysis of localized corrosion in tensile armor wire of flexible riser submitted to sweet stress corrosion cracking testing with crevice

2021 ◽  
Vol 18 ◽  
pp. e2451
Author(s):  
Matheus Porto Trindade ◽  
Ihana Gabriela Conceição de Jesus ◽  
Matheus Mariano da Silva Reis ◽  
Brenno Lima Nascimento ◽  
Fabricio Pinheiro dos Santos ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Localized Corrosion ◽  
Flexible Riser
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