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Precipitation kinetics in a 10.5%Cr heat resistant steel: Experimental results and simulation by TC-PRISMA/DICTRA

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Autor y otros
Rojas Jara, David
Autor y otros
Sanhueza, Juan Pablo
Fecha de carga del item
2019-04-03T19:16:49Z
Fecha de disponibilidad
2019-04-03T19:16:49Z
Fecha de publicacion
2017
Citacion
Materials Chemistry and Physics 200 (2017) 342-353
URI
http://repositorio.udec.cl/handle/11594/3325
Resumen
The precipitation kinetics of secondary phases in a 10.5%Cr heat resistant steel, designed by the authors, was studied experimentally and theoretically. Experimental data of nucleation, growth and coarsening stages for M23C6 carbides, V-MX, Nb-MX and Laves phase were obtained by HRTEM-characterization on samples after tempering (780○C/2 h) and isothermally aging for 1440 h and 8760 h at 650 ○C. Theoretical studies of precipitation behavior of M23C6 and Laves phase were carried out by TC-PRISMA and com- plemented with DICTRA. A good fit between TC-PRISMA simulation and experimental results was ob- tained for M23C6 carbides considering a heterogeneous nucleation in grain boundaries, a semi-coherent interfacial energy of 0.3 J/m2, and decreasing the atomic mobility along grain boundary in order to include the effect of B. Experiments and simulation indicate a low coarsening rate for M23C6 carbides. Furthermore, precipitation of Laves phase at 650 ○C was simulated by TC-PRISMA considering the effect of W and Si segregation at grain boundary, prior to the beginning of the nucleation and growth processes. Therefore, thermodynamic and kinetic boundary conditions were changed purposely in TC-PRISMA. Best agreement with the experimental results was obtained for an interfacial energy of 0.6 J/m2 and het- erogeneous nucleation in grain boundary
Doctorado Nacional project "FONDECYT de Iniciacion" from the Chilean Government Proyecto de inserción de capital humano avanzado from the Chilean Government project "FONDECYT" from the Chilean
idioma
es
Editor
Elsevier
Materials Chemistry and Physics
Materias
TC Prisma
Materias
Dictra
Materias
Modeling
Materias
Tem Characterization
Materias
Heat resistant steels
Titulo
Precipitation kinetics in a 10.5%Cr heat resistant steel: Experimental results and simulation by TC-PRISMA/DICTRA
Tipo de documento
Article


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