Atom probe and STEM studies of carbide precipitation in 2Cr1Mo steel

1993 ◽  
Vol 67 (1-4) ◽  
pp. 334-341 ◽  
Author(s):  
R.C. Thomson ◽  
H.K.D.H. Bhadeshia
Keyword(s):  
Atom Probe ◽  
Carbide Precipitation

scholarly journals An Atom Probe Study of Kappa Carbide Precipitation and the Effect of Silicon Addition

2014 ◽  
Vol 45 (5) ◽  
pp. 2421-2435 ◽  
Author(s):  
Laura N. Bartlett ◽  
David C. Van Aken ◽  
Julia Medvedeva ◽  
Dieter Isheim ◽  
Nadezhda I. Medvedeva ◽  
...  
Keyword(s):  
Atom Probe ◽  
Carbide Precipitation ◽  
Silicon Addition ◽  
Kappa Carbide

Microstructural Features of 'Quenching and Partitioning': A New Martensitic Steel Heat Treatment

2007 ◽  
Vol 539-543 ◽  
pp. 4819-4825 ◽  
Author(s):  
D.V. Edmonds ◽  
K. He ◽  
Michael K. Miller ◽  
F.C. Rizzo ◽  
A. Clarke ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Sheet Steel ◽  
Atom Probe ◽  
Carbide Precipitation ◽  
Martensite Phase ◽  
Quenching And Partitioning ◽  
Transmission Electron ◽  
Quench Temperature ◽  
Untransformed Austenite ◽  
Quenching And Tempering

The microstructure following a new martensite heat treatment has been examined, principally by high-resolution microanalytical transmission electron microscopy and by atom probe tomography. The new process involves quenching to a temperature between the martensite-start (Ms) and martensite-finish (Mf) temperatures, followed by ageing either at or above, the initial quench temperature, whereupon carbon can partition from the supersaturated martensite phase to the untransformed austenite phase. Thus the treatment has been termed ‘Quenching and Partitioning’ (Q&P). The carbon must be protected from competing reactions, primarily carbide precipitation, during the first quench and partitioning steps, thus enabling the untransformed austenite to be enriched in carbon and largely stabilised against further decomposition to martensite upon final quenching to room temperature. This microstructural objective is almost directly opposed to conventional quenching and tempering of martensite, which seeks to eliminate retained austenite and where carbon supersaturation is relieved by carbide precipitation. This study focuses upon a steel composition representative of a TRIP-assisted sheet steel. The Q&P microstructure is characterised, paying particular attention to the prospect for controlling or suppressing carbide precipitation by alloying, through examination of the carbide precipitation that occurs.

scholarly journals Carbide Precipitation in a Low Alloyed Steel during Aging Studied by Atom Probe Tomography and Thermodynamic Modeling

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2009
Author(s):  
Mattias Thuvander ◽  
Hans Magnusson ◽  
Ulrika Borggren
Keyword(s):  
Atom Probe Tomography ◽  
Precipitation Hardening ◽  
Atom Probe ◽  
Carbide Precipitation ◽  
Martensitic Structure ◽  
Number Density ◽  
High Number Density ◽  
Molybdenum Carbides ◽  
The Matrix ◽  
Low Alloyed Steel

Carbide precipitation in martensitic low alloyed steels contributes to the mechanical properties through precipitation hardening. A high number density of carbides is desired to maximize the hardening effect, which is achieved through the precipitation of carbides on the dislocations in the martensitic structure. In this study, the nucleation, growth, and coarsening of vanadium and molybdenum carbides during aging at 600 °C for periods up to four weeks were investigated. The work covers characterization with atom probe tomography, which showed that the nucleation of V and Mo rich MC/M2C carbides takes place on dislocations. The growth of these carbides proceeds by the diffusion of elements to the dislocations, which has been modeled using Dictra software, confirming the rate of the reaction as well as the depletion of carbide formers in the matrix. For longer aging times, particle coarsening will decrease the number density of particles with a transition from dislocation-based carbides to separate rounded carbides.

scholarly journals Nanoscale Solute Partitioning and Carbide Precipitation in a Multiphase TRIP Steel Analyzed by Atom Probe Tomography

JOM ◽  
2018 ◽  
Vol 70 (9) ◽  
pp. 1752-1757 ◽  
Author(s):  
Arun Devaraj ◽  
Zeren Xu ◽  
Fadi Abu-Farha ◽  
Xin Sun ◽  
Louis G. Hector
Keyword(s):  
Atom Probe Tomography ◽  
Trip Steel ◽  
Atom Probe ◽  
Carbide Precipitation ◽  
Solute Partitioning

An Atom Probe Study of κ-carbide Precipitation in Austenitic Lightweight Steel and the Effect of Phosphorus

2017 ◽  
Vol 48 (11) ◽  
pp. 5500-5515 ◽  
Author(s):  
L. N. Bartlett ◽  
D. C. Van Aken ◽  
J. Medvedeva ◽  
D. Isheim ◽  
N. Medvedeva ◽  
...  
Keyword(s):  
Atom Probe ◽  
Carbide Precipitation ◽  
Lightweight Steel

Preferential Sputtering of Ni3Al Single Crystals Studied Using Atom-Probe Field-Ion Microscopy and XPS

1981 ◽  
Vol 39 ◽  
pp. 16-17
Author(s):  
M.P. Thomas ◽  
A.R. Waugh ◽  
M.J. Southon ◽  
Brian Ralph
Keyword(s):  
Single Crystals ◽  
Photoelectron Spectroscopy ◽  
Surface Composition ◽  
Depth Profiling ◽  
Analytical Techniques ◽  
Atom Probe ◽  
Probe Field ◽  
Preferential Sputtering ◽  
Argon Ion Bombardment ◽  
Argon Ion

It is well known that ion-induced sputtering from numerous multicomponent targets results in marked changes in surface composition (1). Preferential removal of one component results in surface enrichment in the less easily removed species. In this investigation, a time-of-flight atom-probe field-ion microscope A.P. together with X-ray photoelectron spectroscopy XPS have been used to monitor alterations in surface composition of Ni3Al single crystals under argon ion bombardment. The A.P. has been chosen for this investigation because of its ability using field evaporation to depth profile through a sputtered surface without the need for further ion sputtering. Incident ion energy and ion dose have been selected to reflect conditions widely used in surface analytical techniques for cleaning and depth-profiling of samples, typically 3keV and 1018 - 1020 ion m-2.

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