Results 11 to 20 of about 879,727 (264)
Metals, 2018 Co-Re-Cr alloys are being developed for high-temperature application in gas turbines. In these alloys, the Cr2Re3-based σ phase is stable when the Cr content is higher than 20 atomic %. The addition of Ni is being studied to partially substitute Cr,
Kai Dörries +5 more
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Journal of Materials Research and Technology, 2022 The CoCrxCuFeMnNiV (x = 0, 0.25, 0.5, 0.75, 1) high-entropy alloy was prepared via vacuum arc smelting, and the effect of different Cr contents on the microstructure evolution and mechanical properties of it was evaluated.
Wen He +4 more
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Microstructural Transformation in a Root Pass of Superduplex Stainless Steel Multipass Welding [PDF]
Materials Research, 2017 The microstructure of the root pass in a superduplex stainless steel multipass welding was investigated.Results showed that the welding metal has an austenite matrix with particles of sigma phase formed in the ferrite/austenite interface and ...
Doris Ivette Villalobos-Vera +1 more
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Evaluation of the low corrosion resistant phase formed during the sigma phase precipitation in duplex stainless steels [PDF]
Materials Research, 1999 The duplex stainless steels, having a volumetric fraction of 50% ferrite and 50% austenite, conciliate high corrosion resistance with good mechanical properties.
Darlene Yuko Kobayashi, Stephan Wolynec
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Metals, 2018 An in situ scanning electron microscope (SEM) study was conducted on a super duplex stainless steel (SDSS) containing 0%, 5% and 10% σ-phase. The material was heat treated at 850 °C for 12 min and 15 min, respectively, to achieve the different ...
Christian Oen Paulsen +4 more
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Structure of the S304H Steel after 20,000 Hours of Ageing [PDF]
Archives of Metallurgy and Materials, 2022 The S304H steel is used in the construction of pressure components of boilers with supercritical operating parameters. The paper presents the results of the research on the microstructure after ageing for 20,000 hours at 650 and 700°C. The microstructure
R. Wersta +4 more
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Kinetics of sigma phase formation in a Duplex Stainless Steel
Materials Research, 2009 This work determines the kinetics of sigma phase formation in UNS S31803 Duplex Stainless Steel (DSS), describing the phase transformations that occur in isothermal aging between 700 and 900 ºC for time periods up to 1032 hours, allowing the ...
Rodrigo Magnabosco
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Journal of Materials Research and Technology, 2020 The effect of multi-pass MAG welding transfer modes on the sigma phase precipitation and corrosion performance of AISI 316L thick plate were investigated.
L.H. Guilherme +4 more
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Materials & Design, 2019 A new mechanism of the deformation-promoted precipitation of the sigma phase during aging at 650 °C in nanocrystallized Super304H austenitic stainless steel was proposed for its extremely early nucleation and subsequently fast growth.
Qingwen Zhou, Jiangwen Liu, Yan Gao
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Synthesis of the stationary-phase sigma factor sigma s is positively regulated by ppGpp [PDF]
Journal of Bacteriology, 1993 Strains of Escherichia coli which lack detectable guanosine 3',5'-bispyrophosphate (ppGpp) display a pleiotropic phenotype that in some respects resembles that of rpoS (katF) mutants. This led us to examine whether ppGpp is a positive regulator of sigma s synthesis.
D R, Gentry +4 more
openaire +2 more sources