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Santosh, D. Hari Hara; Dasari, Prasanth; Kiran, Naga; Prasad, P. Surya

doi:10.1109/iccca.2012.6179134

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…As is seen, the b-values were similar for different time during the oxide film formation, indicating that the AE source mechanism was constant for the whole oxidation. Moreover, the average b-value was 1.455, which was close to those of deformation of corroded specimens [46], dislocations [48], and cracking [48,49]. As mentioned, various AE sources in electrochemical corrosion have been proposed by several researchers such as rupture of passive film [9], hydrogen bubble evolution inside the pits [11][12][13][14], crevice propagation [15], cracking [17,18,20].…”

Section: Mechanism Of Ae Sourcementioning

confidence: 71%

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Acoustic emission behavior of 316LN stainless steel during oxide film formation in high temperature aqueous environment

Chai

Duan

Wang

et al. 2016

Materials & Corrosion

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Acoustic emission (AE) technique was used to study the oxide film formation of 316LN stainless steel (SS) in high temperature aqueous environment. The morphology and chemical compositions of oxide films of 316LN SS base metal and weld were also investigated by using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS). The results indicated that 316LN SS weld had a higher oxidation resistance than that of base metal due to higher amount of chromium and nickel in the weld material. AE activity and intensity were high during the oxide film formation and decreased gradually with increasing immersion time. The evolution of AE hits was consistent with the oxidation kinetics of 316LN SS base metal and weld. The formation of Cr-enrichment layer and Ni(OH) 2 contributed to the enhancement of oxidation resistance, leading to a continuous decrease of AE activity and intensity. Two types of AE waveforms were detected and the frequency spectra of both types mainly ranged from 0.3 to 0.6 MHz. According to the analyses of AE based b-values and parameters, it could be deduced that AE sources during oxide film formation were the plastic deformation of base metal/weld and oxide film.

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Section: Mechanism Of Ae Sourcementioning

confidence: 71%

“…The b-value corresponding to transpassive dissolution (b ¼ 0.25) was higher than that of other processes (b ¼ 0. 15 [49]. It was reported that the b-values attained an almost constant value at 1.6 during stable crack growth, while a sudden and substantial drop in the b-value was observed during unstable crack growth.…”

Section: Mechanism Of Ae Sourcementioning

confidence: 99%