Results 201 to 210 of about 4,525 (236)

Nitrogen and carbon expanded austenite produced by PI3

Surface and Coatings Technology, 2001
Abstract Expanded austenite can be formed either by nitrogen or carbon plasma immersion ion implantation (PI3 ™) from a nitrogen or methane plasma at elevated temperatures. The structure and properties of nitrogen and carbon expanded austenite layers produced on austenitic stainless steel X5CrNi189 are compared.
Blawert, C., Kalvelage, H., Mordike, B. L., Collins, G. A., Short, K. T., Jiraskova, Y., Schneeweiss, O.   +6 more
openaire   +4 more sources

Microstructure of perfect nitrogen-expanded austenite formed by unconstrained nitriding

Scripta Materialia, 2021
Abstract In present work, a perfect nitrogen-expanded austenite free from the deformation defect is prepared by the plasma-based low-energy nitrogen ion implanted (also named plasma source ion nitriding) TEM foil of Fe-Cr-Ni austenitic alloys under an unconstrained condition.
H.L. Che, M.K. Lei
openaire   +3 more sources

Thermal stability of expanded austenite formed on a DC plasma nitrided 316L austenitic stainless steel

Thin Solid Films, 2017
Abstract Expanded austenite formed during low temperature plasma nitriding of austenitic stainless steels is known for its excellent wear and corrosion resistance. These wear and corrosion properties may degrade by exposure of the surface hardened steel to high temperatures, between 400 °C and 700 °C.
André Paulo Tschiptschin, Arthur Seiji Nishikawa, Luis Bernardo Varela, Carlos Eduardo Pinedo   +3 more
openaire   +3 more sources

Thermal decomposition of N-expanded austenite in 304L and 904L steels

Surface Engineering, 2017
In this study, expanded austenite was prepared by an industrial low-temperature plasma nitriding process in 304L and 904L austenitic stainless steels. The current investigation focuses on the assessment of the thermal stability and related phase evolution of the expanded austenite layer during isothermal annealing in protective argon atmosphere at ...
G. Maistro, S. A. Pérez-García, M. Norell, L. Nyborg, Y. Cao   +4 more
openaire   +3 more sources

The nature of expanded austenite

Surface and Coatings Technology, 2000
Abstract This paper attempts to reduce some of the confusion that exists over the nature of the nitrogen-rich layer produced by nitriding austenitic stainless steel at temperatures below 500°C. Cross-sectional transmission electron microscopy shows that the modified layer is dominated by a cubic phase with considerable expansion of the austenite ...
M.P Fewell, D.R.G Mitchell, J.M Priest, K.T Short, G.A Collins   +4 more
openaire   +1 more source

Nitrogen diffusivity in expanded austenite

Surface and Coatings Technology, 2003
Abstract Expanded austenite is a metastable phase formed after nitrogen insertion into austenitic stainless steel, at elevated temperatures between 350 and 400 °C with nitrogen contents between 5 and 30 at.%, thus leading to a lattice expansion of up to 13%.
S. Mändl, F. Scholze, H. Neumann, B. Rauschenbach   +3 more
openaire   +1 more source

Lattice expansion of carbon-stabilized expanded austenite

Scripta Materialia, 2010
The lattice parameter of expanded austenite was determined as a function of the content of interstitially dissolved carbon in homogeneous, carburized thin stainless steel foils. For the first time this expansion of the face-centered cubic lattice is determined on unstrained austenite.
Thomas S. Hummelshøj, Thomas L. Christiansen, Marcel A.J. Somers   +2 more
openaire   +1 more source

Residual stress and cracking in expanded austenite layers

Journal of Physics: Condensed Matter, 2005
The residual stress state and mechanical properties of an expanded austenite layer produced by plasma immersion ion implantation (PI3) on type 316 austenitic stainless steel substrates at different temperatures were investigated. Residual stress data were obtained using the substrate curvature technique for six different treatment temperatures in the ...
D Hoeft, B A Latella, K T Short
openaire   +1 more source

Isotope exchange investigation of nitrogen redistribution in expanded austenite

Scripta Materialia, 2013
Sequential plasma and gaseous nitriding of Fe–18Cr–10Ni–3Mo stainless steel at 390 °C with 14N and 15N isotopes followed by denitriding in flowing hydrogen was investigated. Redistribution of plasma-inserted nitrogen atoms (15N) by subsequent gaseous nitriding (14N) was observed.
Christiansen, T. L., Drouet, M., Martinaviciusc, A., Somers, M. A. J.   +3 more
openaire   +2 more sources

High-order diffractometry of expanded austenite using synchrotron radiation

Surface and Coatings Technology, 2008
There has been much interest in the crystallographic nature of expanded austenite, the nitrogen-rich phase formed in the nitriding of an austenitic stainless steel at relatively low temperature, with previous work leading to a variety of descriptions. This paper reports tests of a total of 10 plausible candidate structures by recording diffractograms ...
M.P. Fewell, J.M. Priest
openaire   +1 more source