Analysis of Barkhausen Noise Signals of Samples Fe–1wt % Cu

Paredes, Valeria; Astudillo, Miriam Rocío Neyra; Nu–ez, N.; Ruzzante, José; Pumarega, María Isabel López; Gómez, M.; Torres, D.N.

doi:10.1016/j.mspro.2012.06.088

Cited by 3 publications

(3 citation statements)

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“…The initial increase is due to formation of CRPs which effectively pin both domain walls (coercivity) and dislocations (hardness). However, longer aging time coarsens the CRPs leading to a reduction in their number density as shown in Table I, 15,[19][20][21] resulting in decrease in H cm and microhardness as the mean free path of domain wall and dislocation movements increases. 15,22 Additionally, the change of inclination in the major loop (i.e., susceptibility) indicates that a larger field is required for S2 and S3 samples to obtain the same magnetization as S1 and S4.…”

Section: Resultsmentioning

confidence: 99%

“…19,24 The initial decrease in MBN RMS is probably caused by the formation of CRPs which decreases the mean free path for magnetic domain movement leading to a general decrease of MBN amplitude. 15,[18][19][20][21]24 However, as the heat treatment continues, the CRPs increase in size and the number density of CRP decreases (Table I), so subsequent decrease in MBN RMS with aging cannot be due to number of precipitates.…”

Section: /Mmentioning

confidence: 99%

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Effects of aging time and temperature of Fe-1wt.%Cu on magnetic Barkhausen noise and FORC

et al. 2016

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Investigation of effects of long-term thermal aging on magnetization process in low-alloy pressure vessel steels using first-order-reversal-curves AIP Advances 7, 056002 (2017); 10.1063/1.4973605Effect of defects, magnetocrystalline anisotropy, and shape anisotropy on magnetic structure of iron thin films by magnetic force microscopy AIP Advances 7, 056806 (2017) Magnetic Barkhausen noise (MBN), hysteresis measurements, first order reversal curves (FORC), Vickers microhardness, and Transmission Electron Microscopy (TEM) analyses were performed on Fe-1wt.%Cu (Fe-Cu) samples isothermally aged at 700 • C for 0.5 -25 hours to obtain samples with different sized Cu precipitates and dislocation structures. Fe-Cu is used to simulate the thermal and irradiation-induced defects in copper-containing nuclear reactor materials such as cooling system pipes and pressure vessel materials. The sample series showed an initial increase followed by a decrease in hardness and coercivity with aging time, which is explained by Cu precipitates formation and growth as observed by TEM measurements. Further, the MBN envelope showed a continuous decrease in its magnitude and the appearance of a second peak with aging. Also, FORC diagrams showed multiple peaks whose intensity and location changed for different aging time. The changes in FORC diagrams are attributed to combined changes of the magnetic behavior due to Cu precipitate characteristics and dislocation structure. A second series of samples aged at 850 • C, which is above the solid solution temperature of Fe-Cu, was studied to isolate the effects of dislocations. These samples showed a continuous decrease in MBN amplitude with aging time although the coercivity and hardness did not change significantly. The decrease of MBN amplitude and the appearance of the second MBN envelope peak are attributed to the changes in dislocation density and structure. This study shows that the effect of dislocations on MBN and FORC of Fe-Cu materials can vary significantly and should be considered in interpreting magnetic signatures. C 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

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Section: Resultsmentioning

confidence: 99%

Section: /Mmentioning

confidence: 99%

Effects of aging time and temperature of Fe-1wt.%Cu on magnetic Barkhausen noise and FORC

et al. 2016

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“…The samples can be tested either by each laboratory by themselves with certain instructions [2] or laboratories can use a group of samples made by a certain party which is distributed to them [3]. We studied pressure vessel samples with different annealing treatments (thermal degradation) as one project partner in a round-robin BNT study.…”

Section: Proficiency Testingmentioning

confidence: 99%

Statistical Evaluation of Barkhausen Noise Testing (BNT) for Ground Samples

Tomkowski

Sorsa

Santa-aho

et al. 2019

Sensors

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Barkhausen noise testing (BNT) is a nondestructive method for investigating many properties of ferromagnetic materials. The most common application is the monitoring of grinding burns caused by introducing locally high temperatures while grinding. Other features, such as microstructure, residual stress changes, hardening depth, and so forth, can be monitored as well. Nevertheless, because BNT is a method based on a complex magnetoelectric phenomenon, it is not yet standardized. Therefore, there is a need to study the traceability and stability of the measurement method. This study aimed to carry out a statistical analysis of ferromagnetic samples after grinding processes by the use of BNT. The first part of the experiment was to grind samples in different facilities (Sweden and Finland) with similar grinding parameters, different grinding wheels, and different hardness values. The second part was to evaluate measured BNT parameters to determine significant factors affecting BNT signal value. The measurement data from the samples were divided into two different batches according to where they were manufactured. Both grinding batches contained measurement data from three different participants. The main feature for calculation was the root-mean-square (RMS) value. The first processing step was to normalize the RMS values for all the measurements. A standard analysis of variance (ANOVA) was applied for the normalized dataset. The ANOVA showed that the grinding parameters had a significant impact on the BNT signal value, while the other investigated factors (e.g., participant) were negligible. The reasons for this are discussed at the end of the paper.

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Characterization Using Passive or Interactive Techniques

Degueldre

2017

The Analysis of Nuclear Materials and Their Environments

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Analysis of Barkhausen Noise Signals of Samples Fe–1wt % Cu

Cited by 3 publications

References 5 publications

Effects of aging time and temperature of Fe-1wt.%Cu on magnetic Barkhausen noise and FORC

Effects of aging time and temperature of Fe-1wt.%Cu on magnetic Barkhausen noise and FORC

Statistical Evaluation of Barkhausen Noise Testing (BNT) for Ground Samples

Characterization Using Passive or Interactive Techniques

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