Nitrogen Diffusion and Stresses during Expanded Austenite Formation in Nitriding
Defect and Diffusion Forum, 2017 Low-temperature nitriding of austenitic stainless steels or chromium containing alloys can produce expanded austenite, known as S-phase, with combined improvement in wear and corrosion resistance. In the paper a critical review of various models for nitrogen diffusion during nitriding is presented.
Katarzyna Tkacz-Śmiech +3 more
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Decomposition kinetics of expanded austenite with high nitrogen contents
International Journal of Materials Research, 2006 Abstract This paper addresses the decomposition kinetics of synthesized homogeneous expanded austenite formed by gaseous nitriding of stainless steel AISI 304L and AISI 316L with nitrogen contents up to 38 at.% nitrogen. Isochronal annealing experiments were carried out in both inert (N2) and reducing (H2) atmospheres.
Thomas Christiansen, Marcel A. J. Somers
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Low‐Temperature Thermochemical Treatments of Face‐Centered Cubic Alloys: New Perspectives for Expanded Austenite From Austenitic Stainless Steels to High‐Entropy Alloys [PDF]
MetalMatThermochemical treatments performed at low temperatures (
Francesca Borgioli
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MFM imaging of expanded austenite formed on 304 SS and CoCrMo alloys [PDF]
Surface and Coatings Technology, 2014 Abstract New data related to the magnetic nature of the expanded austenite layers on CoCrMo and austenitic stainless steel by nitrogen plasma immersion ion implantation (PIII) are presented. Implantations were performed in the temperature range between 300 and 550 °C for a fixed processing time of 1 h.
Öztürk, Orhan +2 more
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From Austenitic Stainless Steel to Expanded Austenite-S Phase: Formation, Characteristics and Properties of an Elusive Metastable Phase [PDF]
Metals, 2020 Austenitic stainless steels are employed in many industrial fields, due to their excellent corrosion resistance, easy formability and weldability. However, their low hardness, poor tribological properties and the possibility of localized corrosion in ...
Francesca Borgioli
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Cellular automata simulation of Nitrogen diffusion in expanded Austenite
Scripta MaterialiaThe diffusion coefficient of nitrogen in expanded austenite forming on Fe-Cr-Ni austenitic stainless steel under the ingress of nitrogen atoms is strongly concentration dependent.
H.L. Che +3 more
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Stress and Composition of Carbon Stabilized Expanded Austenite on Stainless Steel
Metallurgical and Materials Transactions A, 2008 Low-temperature gaseous carburizing of stainless steel is associated with a colossal supersaturation of the fcc lattice with carbon, without the development of carbides. This article addresses the simultaneous determination of stress and composition profiles in layers of carbon expanded austenite obtained by low-temperature gaseous carburizing of AISI ...
Thomas L. Christiansen +1 more
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Determination of Concentration Dependent Diffusion Coefficients of Carbon in Expanded Austenite
Defect and Diffusion Forum, 2008 In the present paper various experimental procedures to experimentally determine the concentration dependent diffusion coefficient of carbon in expanded austenite are evaluated. To this end thermogravimetric carburization was simulated for various experimental conditions and the evaluated composition dependent diffusivity of carbon derived from the ...
Thomas S. Hummelshøj +2 more
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Ferromagnetic and spin wave resonances in thin layer of expanded austenite phase [PDF]
Materials Science-Poland, 2014 Abstract Four samples of austenite coatings deposited by reactive magnetron sputtering on silicon substrate at four different temperatures and pressures were investigated by ferromagnetic resonance (FMR) method at room temperature. The expanded austenite phase S (γ N) layers with thickness in the 160–273 nm ...
Typek, J. +6 more
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Metals, 2021 Low-temperature plasma nitrocarburizing treatments are applied to improve the surface properties of austenitic stainless steels by forming an expanded austenite layer without impairing the excellent corrosion resistance of the steel.
Saeed M. Jafarpour +6 more
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