Bending Failure Mechanism Study of Si-Cr-Ti High Temperature Oxidation Resistance Coating via Acoustic Emission Technique

doi:10.15541/jim20210032

Abstract

Abstract:

In this study, the bending failure process of niobium-based high-temperature oxidation resistance coatings at room temperature was investigated by the acoustic emission technique. The signals were classified by the k-mean clustering method. Based on the cross-sectional scanning electron microscopy observation results, the signals of the coatings under bending load were classfied to substrate deformation, surface vertical cracks, sliding interface cracks, and opening interface cracks. The frequency ranges of various types of signals and the wavelet energy coefficients were obtained by fast Fourier transform and wavelet analysis. The acoustic emission signal frequencies of substrate deformation, surface vertical crack, sliding interface crack, and opening interface crack are 100, 310, 590, and 450 kHz, respectively. The coating bending failure process mainly includes four stages, which are 1) the initial damage stage where vertical cracks sprout on the surface of the tensioned side, 2) the surface vertical crack proliferation stage, 3) the damage accumulation stage where the interface cracks on both sides expand rapidly, and 4) the macroscopic spalling stage where the coating on the stressed side is found to spall significantly.

Key words: acoustic emission, k-means cluster, failure mechanism, high temperature oxidation resistance coating

CLC Number:

TB35

ZHANG Yachen, MENG Jia, CAI Kun, SHENG Xiaochen, LE Jun, SONG Lixin. Bending Failure Mechanism Study of Si-Cr-Ti High Temperature Oxidation Resistance Coating via Acoustic Emission Technique[J]. Journal of Inorganic Materials, 2021, 36(11): 1185-1192.

Figures/Tables 11

Fig. 1 Schematic diagram of the bending specimen

Fig. 2 SEM image of cross-section of high temperature oxidation resistance coating

Fig. 3 Four stages of stress-strain curves and acoustic emission events with time in three-point bending experiments

Fig. 4 Calculated results of DBI with change of k

Fig. 5 Clustering result of acoustic emission signal (a) Duration vs. RMS; (b) Counts vs. energy

Fig. 6 SEM images of specimen (a) Surface vertical cracks and interface cracks of the coating under tension; (b) Interface cracks of the coating under compression; (c) Surface vertical cracks of the coating under tension

Fig. 7 Frequency spectra of the AE signal from (a) surface vertical cracks, (b) substrate deformation, (c) opening interface cracks, and (d) sliding interface cracks

Fig. 8 Wavelet energy spectra of the AE signal from (a) surface vertical cracks, (b) substrate deformation, (c) opening interface cracks, and (d) sliding interface cracks

Fig. 9 Linear fit results for a set of data

Fig. 10 Evaluation of b value of 4 types AE signals with time

Fig. 11 Schematic diagram of failure mechanism

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