Non-destructive indication of plastic deformation of cold-rolled stainless steel by magnetic adaptive testing

Vértesy, Gábor; Tomáš, I.; Mészarós, István

doi:10.1016/j.jmmm.2006.08.001

Cited by 25 publications

(10 citation statements)

References 6 publications

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“…It is well know that, only α ′ structure contributes to ferromagnetic part, due to straininduced γ→α ′ transformation of austenitic steels at RT and above [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. In order to evaluate the amount of α ′ , the saturation magnetization (M s ) was obtained from the plots in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…This transformation can be related to deterioration of the material property for the safe operation of steel-based plants, because it can lead to cracks due to the hard and brittle nature of martensite phase, and associated micro-structural changes. Assessing the degradation of stainless steel by nondestructive magnetic method is of current interest [3][4][5][6][7][8][9][10][11][12][13][14] because magnetic properties are very sensitive to the changes in microstructures.…”

Section: Introductionmentioning

confidence: 99%

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Martensitic transformation in SUS 316LN austenitic stainless steel at RT

et al. 2008

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The results of high-accuracy magnetic measurements on SUS 316LN austenitic stainless steel compressively deformed at room-temperature (RT) are reported here. Even after the mild-deformation of ∼25% true-strain (ε t ), the ferromagnetic phase (α ′ -martensite) could be clearly observed which increased sharply on further deformation. The amount of α ′ was very small (0.18 vol.% at ε t ≈ 60%) when compared to the reported data for other grades of austenitic steels such as 304, 304L, 316 and 316L.The strain-induced α ′ -martensite is further studied by the magnetic hysteresis loops. The coercivity (H C ) and remanence (M r ) were analyzed by subtracting the paramagnetic contribution of the bulk austenite structure. While H C was found to decrease with α ′ , M r remained same (∼67 emu/g) when normalized to the volume fraction of α ′ . The decreasing H C with increasing α ′ and/ or ε t is presumed to be due to the domain wall pinning at the grain boundaries when the cluster size exceeds the domain wall width.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Martensitic transformation in SUS 316LN austenitic stainless steel at RT

et al. 2008

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“…The method was used with success, e.g. for the assessment of plastic deformation [8], embrittlement [9], decarburization of surface [10], and aws [11].…”

Section: Description Of the Methodsmentioning

confidence: 99%

Adaptive Testing of Ferromagnetic Materials Utilizing Barkhausen Noise

Pal’a

Bydzovsky

2014

Acta Phys. Pol. A

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A new method of the Barkhausen noise measurement and optimization of the measured data processing with respect to non-destructive evaluation of ferromagnetic materials is proposed. The measuring method is based on well-known method of magnetic adaptive testing where a complex set of minor hysteresis loops is measured. Collecting the sets of obtained Barkhausen noise envelopes into suitable designed matrices and optimizing the data processing with respect to the maximum sensitivity to the evaluated variable were developed. The method is illustrated on the evaluation of plastic deformation of a steel sample. It is shown that the proposed measuring method and measured data processing bring an improvement of the sensitivity to the evaluated variable when comparing with measuring the traditional Barkhausen noise parameter (root mean square).

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“…This method has very high detecting sensitivity [8][9][10][11][12]. It not only can detect the degree of stress concentration and the fatigue damage status for ferromagnetic material specimen, but can also detect martensite-austenite transformation, mechanics toughness-brittleness transition, dislocation defect density, cementite and ferrite transformation, etc [13][14].…”

Section: Introductionmentioning

confidence: 99%

Researches on Stress Concentration and Fatigue Damage for Ferromagnetic Specimen by Permeability Testing Technology

Shang-Kun¹,

Ren²,

Mei-fang³

2017

IJMEA

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Abstract:The permeability testing technology are new testing and evaluating method, which based on the electromagnetic induction principle, can realize the test and evaluate high sensitively of stress concentration and fatigue damage for ferromagnetic specimen. Taking Q235 and 45 steel for examples, the relationships of the detection signal and the tensile stress, residual stress, fatigue damage are studied from experiments. The results indicate that permeability testing technology can be used effectively to measure the stress state of specimen and the maximum stress suffered before. According to the residual stress signal after suffer tensile, the maximum stress to be suffered before can be determined with high sensitively. It shows that detection sensitivity of the fatigue damage is less than that of stress concentration. The detection sensitivity of fatigue damage for Q235 steel is greater than that of steel 45 steel. The results indicate that the permeability testing technology has a broad application prospect.

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Non-destructive indication of plastic deformation of cold-rolled stainless steel by magnetic adaptive testing

Cited by 25 publications

References 6 publications

Martensitic transformation in SUS 316LN austenitic stainless steel at RT

Martensitic transformation in SUS 316LN austenitic stainless steel at RT

Adaptive Testing of Ferromagnetic Materials Utilizing Barkhausen Noise

Researches on Stress Concentration and Fatigue Damage for Ferromagnetic Specimen by Permeability Testing Technology

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