Magnetic properties of decarburized steels: An investigation of the effects of grain size and carbon content

Ranjan, R.; Jiles, David; Rastogi, P. K.

doi:10.1109/tmag.1987.1065175

Cited by 112 publications

(30 citation statements)

References 12 publications

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“…No gráfico exibido na Figura 5 verifica -se que o valor de pico foi maior è medida que os corpos de prova foram submetidos a uma quantidade maior de deformação plástica. O aumento do valor de pico indica uma quantidade maior de saltos em razão da quantidade de obstáculos ter aumentado [8].…”

Section: Figura 4 Rota Cisalhamento Cíclico Aço Gounclassified

Efeito Do Cisalhamento Cíclico Na Resposta Magnética Do Aço Go

Maria¹,

Júnior²,

Aguilar³

et al. 2018

ABM Proceedings

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ResumoOs aços elétricos tem sido uma alternativa para aperfeiçoar a relação eficiência/perda magnética dos equipamentos elétricos, sem a necessidade de grandes alterações de projeto Esses aços, também conhecidos como aços ao silício, podem ser de grão orientado ou não orientado, sendo suas propriedades, de modo geral, dependentes das diferentes condições adotadas para o processamento dos mesmos. Deste modo, considerando essa relação entre as condições de solicitação mecânica e o desempenho desses materiais este trabalho apresenta o estudo da resposta magnética exibida pelo aço de grão orientado após as chapas desse material serem submetidas à rota de processamento envolvendo a aplicação dos esforços de cisalhamento direto / cisalhamento reverso (cisalhamento cíclico). Os resultados indicaram a dependência das propriedades em função da quantidade de deformação plástica, ocasionando, de modo geral, o decaimento do desempenho magnético do mesmo. Palavras-chave: Aço GO; Ensaio Barkhausen; Cisalhamento cíclico, EFFECT OF CYCLIC SHEARING ON THE MAGNETIC PROPERTY OF GO STEEL AbstractThe silicon steels have been an alternative to optimize the relative efficiency / core loss of electrical equipments without the need for major design changes These steels also known as electrical steels and have two main types: oriented or non-oriented. The magnetic properties of these materials generally depend on the processing conditions and, considering the relationship between the mechanical efforts and the magnetic properties, this work presents the study of the magnetic response exhibited by grain-oriented steel after the sheets of this material have been submitted to the processing route involving the application of forward and reverse shearing (cyclic shearing). The results indicated the dependence of magnetic properties identified by Barkhausen noise with the amount of plastic deformation. In general, the cyclic loading resulted in a decay of the magnetic property of the GO steel.

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Section: Figura 4 Rota Cisalhamento Cíclico Aço Gounclassified

Efeito Do Cisalhamento Cíclico Na Resposta Magnética Do Aço Go

Maria¹,

Júnior²,

Aguilar³

et al. 2018

ABM Proceedings

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“…Many studies have shown that these wall displacements, and thus the Barkhausen effects, are directly linked to the local pinning of walls by obstacles such as inclusions, 6) precipitates, 7,8) grain boundaries, 9,10) as well as dislocations tangles. 11,12) The main observation drawn from these studies is that the increase in strength and in number of pinning obstacles leads to an increase of the Barkhausen noise signal.…”

Section: Influence Of the Metallurgical State Of Steelsmentioning

confidence: 99%

Ferrite-Martensite Steels Characterization Using Magnetic Barkhausen Noise Measurements

et al. 2004

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Magnetic Barkhausen noise measurements have been carried out to characterize Ferrite-Martensite steels. Using thermal treatments, the volume fraction and the carbon content of martensite were varied in reasonable proportions. The results indicate that the Barkhausen noise measurements can easily allows us to distinguish the two phases, ferrite and martensite. Using a simple mixture rule, we found a good correlation between the martensite volume fraction and the Barkhausen noise amplitude. We observed that the value of the magnetic field for which the Barkhausen noise peak is obtained, correlates with the carbon content of martensite.We demonstrated that it was possible to use Barkhausen noise measurement to determine both the relative proportion of the two phases (ferrite and martensite) and the carbon content of martensite. The use of this technique could be extended to characterize industrial Dual-Phase steels.

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“…Barkhausen Noise and Stress BN has been related to grain size (Tiitto, 1977;Ranjan et al, 1987), carbon content (Ranjan et al, 1987), pearlite colony and lamellar spacing (Sundstrom and Torronen, 1979;Clapham et al, 1991), and residual stress (Sandstrom and Torronen, 1979;Dhar and Atherton, 1993). Elastic stresses influence how domains choose their easy direction of magnetization.…”

Section: Domainsmentioning

confidence: 99%

Rockburst Research Applied to Nuclear Event Discrimination

Hoffman¹,

Cook²,

Baker³

et al. 1999

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Public reporting burden for this collection of information is estimated to average 1 hour per respo gathering and maintaining the data needed, and completing and reviewing the collection of inforr-* collection of information, including suggestions for reducing this burden, to Washington Headqua Davis Highway, Suite 1204, Arlington, VA 22202-4302, and Rockbursts produce seismic signals that are similar to those associated with near surface earthquakes and explosions. Some o: the methods developed for source mechanism studies also encompass imaging techniques appropriate for nuclear event verification, and, as a result, have implications for the Comprehensive Test Ban Treaty (CTBT). Past experiments have demonstrated a clear relationship between Barkhausen Noise (BN) and stress in pipeline steel samples. Stress can affect the nature of the pinning sites at domain boundaries which in turn plays a role in the way that domain walls move and cause BN pulses. We have conducted experiments to detect a relationship between BN and stress in magnetite-rich rocks. These experiments were performed by applying uniaxial loading from 4500N to 55000N to cylindrical core samples of magnetite-rich rocks obtained from the Stillwater Complex in Montana. A pick-up coil was used to detect the BN pulses and an electromagnet was used to magnetize the samples. BN pulses were recorded during a specified time interval for each increment of loading. The pick-up coil was positioned to be near magnetite-rich regions of the sample. We have observed a linear increase in the number of BN pulses with increased loading. Ongoing research is focused on refining the experimental procedure to increase the bandwidth of recording and eliminate possible sources of noise in the experiments. The results of this study might help us to understand the nature of the remagnetization that often accompanies large-scale tectonic events. Moreover, this study could lead to a method of nondestructive testing to determine state of stress at mine walls. MQOQttO I5(j SUMMARY The basis for this research is that rockbursts produce seismic signals that are similar to those associated with near surface earthquakes and explosions. A complete understanding of source mechanisms is necessary for the correct identification of these events. Some of the methods developed for source mechanism studies also encompass imaging techniques appropriate for nuclear event verification, and, as a result, have implications for the Comprehensive Test Ban Treaty (CTBT). SUBJECT TERMSPCI/Atlantic Scientific INSAR software was purchased last fall for elevation change detection at a rockburst site using radar interferometry. We have been familiarizing ourselves with this software and radar remote sensing. Images have recently been acquired that cover the site of a large rockburst.The air wave can interfere with the rock wave in Ground Penetrating Radar (GPR) transillumination experiments making it difficult to pick the rock wave first arrivals in mines. This was particularly a problem at small t...

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Magnetic properties of decarburized steels: An investigation of the effects of grain size and carbon content

Cited by 112 publications

References 12 publications

Efeito Do Cisalhamento Cíclico Na Resposta Magnética Do Aço Go

Efeito Do Cisalhamento Cíclico Na Resposta Magnética Do Aço Go

Ferrite-Martensite Steels Characterization Using Magnetic Barkhausen Noise Measurements

Rockburst Research Applied to Nuclear Event Discrimination

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