2009
DOI: 10.1007/s10751-009-9929-4
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Sigma phase—one of the main reasons for deterioration of stainless steels properties

Abstract: Relevance of the Mössbauer spectroscopy in the investigation of the σ-phase in Fe-Cr and Fe-V systems, base alloys for technologically important steels, will be demonstrated by showing its standard applications in identification of σ, quantitative study of the kinetics of α-to-σ phase transformation and determination of the Curie and Debye temperatures.

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Cited by 11 publications
(12 citation statements)
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“…The spectra for the samples annealed at 500 and 700 • C were numerically elaborated using one singlet, one doublet and the quasi-distribution of three or eight sextets, respectively. The single-line component, which has a relatively high contribution in the spectrum for the sample annealed at 700 • C, may be attributed to the FeCr secondary phase because its isomer shift has negative sign and the value similar to that reported for the alloy Fe 53.8 Cr 46.2 [14] as well as for the FeCr nanoparticles [15]. The singlet with a contribution of 2.4% observed in the spectrum for the sample annealed at 500 • C also may come from the FeCr secondary phase, though there were no clear diffraction lines in the XRD pattern.…”
Section: Mössbauer Spectroscopy Studiessupporting
confidence: 75%
“…The spectra for the samples annealed at 500 and 700 • C were numerically elaborated using one singlet, one doublet and the quasi-distribution of three or eight sextets, respectively. The single-line component, which has a relatively high contribution in the spectrum for the sample annealed at 700 • C, may be attributed to the FeCr secondary phase because its isomer shift has negative sign and the value similar to that reported for the alloy Fe 53.8 Cr 46.2 [14] as well as for the FeCr nanoparticles [15]. The singlet with a contribution of 2.4% observed in the spectrum for the sample annealed at 500 • C also may come from the FeCr secondary phase, though there were no clear diffraction lines in the XRD pattern.…”
Section: Mössbauer Spectroscopy Studiessupporting
confidence: 75%
“…The majority of the studies related to this system are performed near to the equiatomic region since in this region the r-FeCr phase is precipitated which deteriorates the mechanical properties of the alloy [3]. Sigma structure is obtained at about 50% at.…”
Section: Introductionmentioning
confidence: 99%
“…A mínima presença da fase  nesses materiais causa deterioração das propriedades mecânicas e redução da resistência à corrosão sob elevadas temperaturas podendo trazer enormes riscos de segurança nas operações industriais e prejuízos financeiros. 30 Dentre os 50 exemplos de ligas binárias na fase  que são conhecidos, apenas  -FeCr e  -FeV apresentam ordenamento magnético. 30 Estudos sobre esse tema foram realizados em diversos sistemas visando uma melhor compreensão de suas características e propriedades.…”
Section: A Fase unclassified
“…30 Dentre os 50 exemplos de ligas binárias na fase  que são conhecidos, apenas  -FeCr e  -FeV apresentam ordenamento magnético. 30 Estudos sobre esse tema foram realizados em diversos sistemas visando uma melhor compreensão de suas características e propriedades. 16,[30][31][33][34][35] Estudos de difração de nêutrons foram utilizados para verificar a ocupação dos sítios nas ligas de FeV com fase  .…”
Section: A Fase unclassified
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