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Kinetics of heterogeneous dislocation precipitation of NbC in alpha-iron

✍ Scribed by C. Hin; Y. Bréchet; P. Maugis; F. Soisson


Book ID
103998594
Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
800 KB
Volume
56
Category
Article
ISSN
1359-6454

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✦ Synopsis


We propose Monte Carlo simulations of the precipitation kinetics of NbC on dislocations in a-iron based on an atomistic description of the main mechanisms controlling the kinetic pathway. The algorithm takes into account realistic diffusion properties, with a rapid diffusion of C atoms by interstitial jumps and a slower diffusion of Fe and Nb atoms by vacancy jumps. A simple model of dislocation includes interactions with solute atoms, through local segregation energy and long range elastic fields. The relative importance of local segregation energies and long range elastic stresses on the precipitation characteristics, such as early segregation of carbon atoms on dislocations, transient precipitation of metastable carbides, and homogeneous and heterogeneous NbC precipitation, is discussed.


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✍ R.H Doremus 📂 Article 📅 1958 🏛 Elsevier Science ⚖ 627 KB

The precipitation of carbon in a-iron wires strained to different amounts was followed by means of internal friction measurements. As the amount of strain increased, the rate of precipitation became faster and the shapes of the time-transformation curves gradually changed, although no abrupt transit