Journal ArticleDOI
Precipitation and clustering in a Ti-Mo steel investigated using atom probe tomography and small-angle neutron scattering
Sharmistha Dhara,Ross K. W. Marceau,Kathleen Wood,Thomas Dorin,Ilana Timokhina,Peter Hodgson +5 more
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In this article, the isothermal evolution of nanometre-sized precipitates formed in a Ti-Mo microalloyed steel through interphase precipitation has been investigated using atom probe tomography and small-angle neutron scattering.Abstract:
The isothermal evolution of nanometre-sized precipitates formed in a Ti-Mo microalloyed steel through interphase precipitation has been investigated using atom probe tomography and small-angle neutron scattering. The coiling time and applied strain have been varied to observe the precipitate evolution at a constant coiling temperature of 650 °C, where various evolution parameters such as particle radius, number density, volume fraction and chemical composition have been evaluated and compared. The possibility of early stage solute clustering and its effect on precipitate formation have also been investigated. Clustering of Ti, Mo and C atoms as Ti-C and Mo-C has been observed at the shortest coiling time of 5 min. These clusters are assumed to be precursors to the carbide precipitates observed in the system, which exhibit a metastable composition, containing a carbon fraction (C/Ti+Mo ratio) in the range of 0.2–1. In particles having a Guinier radius > 3 nm, however, the average chemical composition approached the stable MC carbide stoichiometry with Ti/Mo ratio ~2.5 and C/(Ti+Mo) ratio ~0.55. This study reveals that the precipitate coarsening kinetics are very slow, with average particle diameter 10 h) in both the undeformed and deformed conditions. This is believed to be due to the reduction in equilibrium Ti content in the matrix as a result of partial replacement of Ti by Mo (Ti/Mo ratio > 2) in the precipitate lattice, in the presence of excess C in the system.read more
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Current Challenges and Opportunities in Microstructure-Related Properties of Advanced High-Strength Steels
Dierk Raabe,Binhan Sun,Alisson Kwiatkowski da Silva,Baptiste Gault,Baptiste Gault,Hung-Wei Yen,Karo Sedighiani,Karo Sedighiani,Prithiv Thoudden Sukumar,Isnaldi R. Souza Filho,Shyam Katnagallu,Shyam Katnagallu,Eric Aimé Jägle,Eric Aimé Jägle,Philipp Kürnsteiner,Navyanth Kusampudi,Leigh T. Stephenson,Michael Herbig,Christian Liebscher,Hauke Springer,Hauke Springer,Stefan Zaefferer,Vitesh Shah,Su Leen Wong,Christian Baron,Martin Diehl,Franz Roters,Dirk Ponge +27 more
TL;DR: In this article, the deformation and strain hardening mechanisms of Mn-containing steels that utilize complex dislocation substructures, nanoscale precipitation patterns, deformation-driven transformation, and twinning effects are discussed.
Journal ArticleDOI
Metrology of small particles and solute clusters by atom probe tomography
TL;DR: In this paper, an approach that allows direct comparison of APT and small-angle (X-Ray) scattering (SA(X)S) performed on the same material is presented.
Journal ArticleDOI
Clustering, nano-scale precipitation and strengthening of steels
TL;DR: In this article, the authors present a review of nano-precipitation in low temperature body centred cubic phases (ferrite, bainitic ferrite and martensite) in a range of steels from high strength low alloyed to maraging ones.
Journal ArticleDOI
Coupled segregation mechanisms of Sc, Zr and Mn at θ′ interfaces enhances the strength and thermal stability of Al-Cu alloys
TL;DR: In this paper, the authors used trace additions of Sc, Zr and Mn in an Al-6.5% Cu alloy to refine and stabilise the intermediate theta-prime precipitates.
Journal ArticleDOI
Application of advanced experimental techniques to elucidate the strengthening mechanisms operating in microalloyed ferritic steels with interphase precipitation
TL;DR: In this paper, the microstructure and tensile properties of thermo-mechanically processed ferritic steels alloyed with Mo, Cr, V and Nb were investigated using scanning transmission electron microscopy, atom probe tomography and uniaxial tensile loading.
References
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The kinetics of precipitation from supersaturated solid solutions
I.M. Lifshitz,V.V. Slyozov +1 more
TL;DR: In this paper, an analysis is made of the process whereby diffusion effects can cause the precipitation of grains of a second phase in a supersaturated solid solution, and the kinetics of this type of grain growth are examined in detail.
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Reduction and analysis of SANS and USANS data using IGOR Pro
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Dislocation Theory of Yielding and Strain Ageing of Iron
A H Cottrell,B A Bilby +1 more
TL;DR: In this article, a theory of yielding and strain ageing of iron, based on the segregation of carbon atoms to form atmospheres round dislocations, is developed and the force needed to release a dislocation from its atmosphere is roughly estimated and found to be reasonable.
Journal ArticleDOI
Irena: tool suite for modeling and analysis of small-angle scattering
Jan Ilavsky,Pete R. Jemian +1 more
TL;DR: Irena as mentioned in this paper is a tool suite for analysis of both X-ray and neutron small-angle scattering (SAS) data within the commercial Igor Pro application, bringing together a comprehensive suite of tools useful for investigations in materials science, physics, chemistry, polymer science and other fields.