Sigma Phase
Modeling of structural and thermodynamics properties of sigma-phase for the Fe-Cr system
... of sigma – phases were used in papers on ab-initio calculations of energy properties of sigma – phases for the Cr-Fe system over the time of 10-15 years [1-2, 4-5, ...which sigma – phase ...
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Mat. Res. vol.16 número5
... of sigma phase at high temperature which could potentially be responsible for catastrophic service failure of ...of sigma phase into a ferrite-austenite ...by sigma phase ...of ...
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art hfgabreu The σ phase formation
... of sigma phase precipitation on the texture of austenite in a duplex stainless steel UNS S31803 was ...investigated. Sigma phase quantification was precisely performed by electron ...
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Mat. Res. vol.2 número4
... different phase transformations may occur, such as that responsible for sigma phase precipitation, which make the steel susceptible to localized ...the sigma phase precipitation a new ...
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art hfgabreu , magnetic and mechanical
... AISI 444 steel is an 18Cr–2Mo ferritic stainless steel, containing Ti and Nb as stabilizing elements. The effects of aging in the 560–800 °C range on the microstructure, mechanical and magnetic properties were ...
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Rev. Esc. Minas vol.66 número4
... In this context, the proposal of this subject was to evaluate the niobium ef- fect on the microstructure, microhard- ness and phase transformation in the SEW 410 Nr.14517 austenitic-ferritic stainless steel. ...
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Mat. Res. vol.20 número1
... of analyzing by JMAK, about the nucleation mode, that is, only by V V in practice, as shown here are deviations of the assumptions from the model. Therefore, MP formulation by S V e <λ> helps to respond on the ...
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Mat. Res. vol.19 número5
... as sigma (σ) and chi (χ), which may cause a severe deterioration of mechanical ...of sigma phase during heat treatments at temperatures in which intermetallic phases can be formed (800ºC-900°C) was ...
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Mat. Res.
... intermetallic phase precipitation for diferent times of isothermal heat treatment at 850 ...the sigma phase entailed the formation of secondary austenite depleted in ...
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Double Kinetics of Intermetallic Phase Precipitation in UNS S32205 Duplex Stainless Steels Submitted to Isothermal Heat Treatment
... intermetallic sigma and chi phases in as-rolled UNS S32205 duplex stainless steel was observed during isothermal heat treatments at 850 ...the sigma phase involved double ...chi phase as ...
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Mat. Res. vol.20 número2
... of sigma phase takes place during cooling in the temperature range of 1200°C-800°C as well as the formation of austenite through the decomposition of ferrite to sigma phase and ...since ...
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Mat. Res. vol.17 número4
... on phase transformation of duplex stainless ...Laves phase formation. This phase, in association with the sigma phase, causes a significant increase in the hardness and wear resistance ...
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Mat. Res. vol.12 número3
... that sigma phase formation is strongly related to ferrite consumption, and the obser- vation that sigma preferably nucleates at ferrite-austenite ...and sigma phase content ...
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DESCRIÇÃO DE UM PROJETO SEIS SIGMA PARA O CELOG
... Seis Sigma para melhoria do processo de aquisição de itens de ressuprimento visa redução do tempo de entrega desses materiais, além de contar com uma equipe composta por efetivo da Divisão de Nacionalização e de ...
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On quasistability of a vector combinatorial problem with \Sigma-MINMAX and \Sigma-MINMIN partial criteria
... The quasistability analysis was carried out for vector combinato- rial problems with lexicographic principle of optimality [7, 8], majority principle of optimality [9] and Pareto princip[r] ...
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Precipitação de fase de laves no aço inoxidável superferrítico 28%Cr-4%Ni-2%Mo-N...
... A fase se forma na mesma faixa de temperatura da fase sigma, mas em uma fração muito menor. Se bem desenvolvida, a fase qui pode ser distinguida opticamente da fase sigma pela sua morfologia em bloco e ...
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A gestão orçamental: o caso da empresa SIGMA
... empresa Sigma é fundamental a existência de comunicação entre departamentos e funcionários, na medida em que os diversos centros de responsabilidade dependem das informações uns dos outros, existindo interligação ...
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Test Equating of the Medical Licensing Examination in 2003 and 2004 Based on the Item Response Theory
... To compute the equivalent constant based on the item res- ponse theory; there are regression method, mean and sigma method, robust mean and sigma method, and item character- istic method [ 2 ] . Fifth, ...
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Sigma-1 receptor agonists directly inhibit Nav1.2/1.4 channels.
... A sigma-1 receptor siRNA construct was designed to target nucleotides 500–519 in the human sigma-1 receptor gene, as has been previously reported ...The sigma-1 receptor protein expression in the ...
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Rev. bras. gest. neg. vol.18 número62
... Six Sigma that refers to the ield of project management is its projectized ...Six Sigma from other quality initiatives are its structured procedures for improvement, characterized by disciplined and ...
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