Case depth in SAE 1020 steel using barkhausen noise
The most widely used thermochemical process for surface hardening of steels is case hardening. Using several different heat treatments, martensitic surface layers were formed on SAE 1020 steel into which carbon had been diffused. Case depths were measured by traditional destructive techniques. Barkh...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2013-06-01
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| Series: | Materials Research |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392013000500009&tlng=en |
| _version_ | 1798019436605603840 |
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| author | Alessandra Drehmer Gunther J. L. Gerhardt Frank P. Missell |
| author_facet | Alessandra Drehmer Gunther J. L. Gerhardt Frank P. Missell |
| author_sort | Alessandra Drehmer |
| collection | DOAJ |
| description | The most widely used thermochemical process for surface hardening of steels is case hardening. Using several different heat treatments, martensitic surface layers were formed on SAE 1020 steel into which carbon had been diffused. Case depths were measured by traditional destructive techniques. Barkhausen noise measurements were made and both the RMS Barkhausen pulse envelope and the fast Fourier transform (FFT) were obtained from numerical calculation. The FFT amplitudes, functions of frequency, were associated with distance from the sample surface using the skin depth equation δ = 1/ (πfσµ)½ , where f is the frequency of the electromagnetic wave, s is the electrical conductivity, and µ is the magnetic permeability. We define a normalized power index (NPI) which can be used to estimate case depths. The NPI is discussed in relation to the sample microstructure and it is shown that the case depth is most easily determined when the magnetic properties of the surface layer and core are substantially different. |
| first_indexed | 2024-04-11T16:39:09Z |
| format | Article |
| id | doaj.art-5f21d97345964658b1f16d9d68a6c721 |
| institution | Directory Open Access Journal |
| issn | 1516-1439 |
| language | English |
| last_indexed | 2024-04-11T16:39:09Z |
| publishDate | 2013-06-01 |
| publisher | Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
| record_format | Article |
| series | Materials Research |
| spelling | doaj.art-5f21d97345964658b1f16d9d68a6c7212022-12-22T04:13:42ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392013-06-011651015101910.1590/S1516-14392013005000095Case depth in SAE 1020 steel using barkhausen noiseAlessandra Drehmer0Gunther J. L. Gerhardt1Frank P. Missell2Universidade de Caxias do SulUniversidade de Caxias do SulUniversidade de Caxias do SulThe most widely used thermochemical process for surface hardening of steels is case hardening. Using several different heat treatments, martensitic surface layers were formed on SAE 1020 steel into which carbon had been diffused. Case depths were measured by traditional destructive techniques. Barkhausen noise measurements were made and both the RMS Barkhausen pulse envelope and the fast Fourier transform (FFT) were obtained from numerical calculation. The FFT amplitudes, functions of frequency, were associated with distance from the sample surface using the skin depth equation δ = 1/ (πfσµ)½ , where f is the frequency of the electromagnetic wave, s is the electrical conductivity, and µ is the magnetic permeability. We define a normalized power index (NPI) which can be used to estimate case depths. The NPI is discussed in relation to the sample microstructure and it is shown that the case depth is most easily determined when the magnetic properties of the surface layer and core are substantially different.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392013000500009&tlng=encase depthSAE 1020 steelBarkhausen noisefrequency spectrum |
| spellingShingle | Alessandra Drehmer Gunther J. L. Gerhardt Frank P. Missell Case depth in SAE 1020 steel using barkhausen noise Materials Research case depth SAE 1020 steel Barkhausen noise frequency spectrum |
| title | Case depth in SAE 1020 steel using barkhausen noise |
| title_full | Case depth in SAE 1020 steel using barkhausen noise |
| title_fullStr | Case depth in SAE 1020 steel using barkhausen noise |
| title_full_unstemmed | Case depth in SAE 1020 steel using barkhausen noise |
| title_short | Case depth in SAE 1020 steel using barkhausen noise |
| title_sort | case depth in sae 1020 steel using barkhausen noise |
| topic | case depth SAE 1020 steel Barkhausen noise frequency spectrum |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392013000500009&tlng=en |
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