Atom probe studies of early stages of precipitation reactions in maraging steels I. Co- and Ti-containing C-300 steel

1992 ◽  
Vol 26 (4) ◽  
pp. 517-522 ◽  
Author(s):  
W Sha ◽  
A Cerezo ◽  
G.D.W Smith
Keyword(s):  
Atom Probe ◽  
Maraging Steels ◽  
Early Stages ◽  
Precipitation Reactions

scholarly journals Relationship between the Yield Strength-Fracture Toughness Balance and the Multiscale Microstructure of a Maraging Stainless Steel for Aircraft Applications

2016 ◽  
Vol 879 ◽  
pp. 413-418
Author(s):  
Charline Le Nué ◽  
Jean Marc Cloué ◽  
Marie Hélène Mathon ◽  
Sylvain Puech ◽  
Denis Béchet ◽  
...  
Keyword(s):  
Yield Strength ◽  
Volume Fraction ◽  
Aging Treatment ◽  
Atom Probe ◽  
Titanium Content ◽  
Particle Number Density ◽  
Strong Increase ◽  
Maraging Steels ◽  
Maraging Stainless Steel ◽  
Co Precipitation

Two grades of Fe-Cr-Ni-Al-Ti-Mo maraging steels, with a different titanium content, were investigated. Particular attention was given to the correlation between the precipitated phases and the yield strength. Synchrotron X-ray diffraction, small-angle neutron scattering and atom probe experiments were performed to determine the crystal structure, shape, size distribution, chemical composition, particle number density and volume fraction of precipitates. Both alloys show a strong increase in strength after an aging treatment, which is attributed to the co-precipitation of two different intermetallic phases. Strengthening by a single precipitation of β-Ni (Al,Ti) particles induces a saturation of yield strength around 1600 MPa above a volume fraction of 6 %. The improvement of yield strength is then obtained by introducing a nanoscale co-precipitation of η-Ni3(Ti,Al) phase.

The Measurement of Composition During the Early Stages of the Spinodal Decomposition of Fe-Cr Alloys

1990 ◽  
Vol 186 ◽  
Author(s):  
M.G. Hetherington ◽  
J.M. Hyde ◽  
M.K. Miller
Keyword(s):  
Monte Carlo ◽  
Phase Separation ◽  
Spinodal Decomposition ◽  
Atom Probe ◽  
Statistical Techniques ◽  
Fine Scale ◽  
Monte Carlo Calculations ◽  
Early Stages ◽  
Non Linear

AbstractThe properties of many advanced alloys are derived from extremely fine-scale microstructures. This poses interesting questions about the measurement of composition on this scale. The phase separation of model Fe-Cr alloys has been been studied with the atom-probe. Statistical techniques have been used to estimate the composition and compare the results with the predictions of linear and non-linear theories of spinodal decomposition and the distributions obtained from Monte-Carlo calculations.

Atom Probe Tomography I. Early Stages of Precipitation of NbC and NbN in Ferritic Steels

2006 ◽  
Vol 8 (12) ◽  
pp. 1202-1205 ◽  
Author(s):  
F. Danoix ◽  
E. Bémont ◽  
P. Maugis ◽  
D. Blavette
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Ferritic Steels ◽  
Early Stages

The Early Stages of Silicide Formation on Metal and Silicon Surfaces, Time-of-Flight Atom-Probe Studies of Atomic Structures and Compositions

1983 ◽  
Vol 25 ◽  
Author(s):  
T. T. Tsong
Keyword(s):  
Low Temperature ◽  
Adsorption Layer ◽  
Depth Profiling ◽  
Atom Probe ◽  
Silicon Surfaces ◽  
Silicide Formation ◽  
Future Directions ◽  
Atomic Structures ◽  
Early Stages ◽  
Temperature Diffusion

ABSTRACTThe early stages of silicide formation on metal and silicon surfaces have been studied in the atom-probe FIM. Precursors to silicide formation are low temperature diffusion of single Si atoms, their interactions, and adsorption layer superstructure formation. These phenomena have been studied quantitatively. At high temperatures, silicide films can be formed. Four distinctive stages of silicide formation on tungsten surfaces have been observed from the atomically resolved FIM images. Formation of silicide layers on platinum, nickel, and silicon surfaces have also been studied. From both the atom-probe compositional depth profiling and the FIM observation one can conclude that the interface formed at low temperature is sharp. At high temperature, Si atoms can diffuse deep into a Pt matrix and Ni atoms into a Si matrix. Conclusions drawn from these atom-probe studies are summarized, and future directions suggested.

A Combined TEM and Atom Probe Approach to Analyse the Early Stages of Age Hardening in AA 6016

2016 ◽  
Vol 877 ◽  
pp. 231-236 ◽  
Author(s):  
Olaf Engler ◽  
C. Schäfer ◽  
Henk Jan Brinkman ◽  
Calin D. Marioara ◽  
Masaya Kozuka ◽  
...  
Keyword(s):  
Atom Probe ◽  
Age Hardening ◽  
Artificial Ageing ◽  
Phase Decomposition ◽  
Number Density ◽  
Early Stages ◽  
Transmission Electron ◽  
Different Types ◽  
6Xxx Series ◽  
Insight Into

In this study we aim at combining the results from transmission electron microscopy (TEM) and atom probe tomography (APT) to study the early stages of phase decomposition in the age hardening alloy AA 6016. Samples are subjected to different periods of natural ageing or artificial pre-ageing at elevated temperature in order to produce different types of clusters and early stages of precipitation before age hardening commences. APT is utilized to detect clusters and identify their compositions, whereas TEM is applied to analyse and quantify number density and sizes of the particles during artificial ageing at 185°C. It is shown that the two techniques, TEM and APT, are complementary and a combined approach yields more detailed insight into the early stages of phase decomposition in age hardening 6xxx series alloys than possible by the sole use of either technique individually.

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