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Title: Numerical Simulation of Microstructural Evolution during Sintering at the Meso-Scale.

Abstract

Abstract not provided.

Authors:
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1106014
Report Number(s):
SAND2011-7881C
465055
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the MS&T held October 16-20, 2011 in Columbus, OH.
Country of Publication:
United States
Language:
English

Citation Formats

Tikare, Veena. Numerical Simulation of Microstructural Evolution during Sintering at the Meso-Scale.. United States: N. p., 2011. Web.
Tikare, Veena. Numerical Simulation of Microstructural Evolution during Sintering at the Meso-Scale.. United States.
Tikare, Veena. Sat . "Numerical Simulation of Microstructural Evolution during Sintering at the Meso-Scale.". United States. doi:. https://www.osti.gov/servlets/purl/1106014.
@article{osti_1106014,
title = {Numerical Simulation of Microstructural Evolution during Sintering at the Meso-Scale.},
author = {Tikare, Veena},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Oct 01 00:00:00 EDT 2011},
month = {Sat Oct 01 00:00:00 EDT 2011}
}

Conference:
Other availability
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  • Abstract not provided.
  • Solution annealed (SA) 304 and cold-worked (CW) 316 austenitic stainless steels were irradiated with protons in order to study the potential effects of helium, irradiation dose, and irradiation temperature on microstructural evolution, especially void swelling, with relevance to the behavior of austenitic core internals in Pressurized Water Reactors (PWRs). These steels were irradiated at 300 C with 1 MeV protons at doses up to 10 dpa. Both steels were irradiated either with or without 15 appm helium pre-implantation. Irradiation was also conducted at 340 C, but only with 15 appm helium pre-implantation. Transmission electron microscopy (TEM) revealed that small, heterogeneouslymore » distributed voids were observed in both alloys at 300 C, but only after helium pre-implantation. At 340 C, however, both SA 304 and CW 316 steels exhibited homogeneous void formation, suggesting a significant role of both helium and irradiation temperature in void nucleation. Compared with CW 316 voids developed sooner in the SWA 304 alloy at 300 and 340 C, consistent with the behavior observed at higher temperature (>370 C) in the EBR-II fast reactor, but the development of the Frank loop microstructure with increasing exposure with similar in both alloys. Helium pre-implantation had a measurable effect on the details of Frank loop formation.« less
  • Superplastic tensile deformation is simulated in 2 dimensions by incorporating grain boundary diffusion and concurrent grain growth derived from static and dynamic growth mechanisms. The following relationship is found between microstructural changes and deformation behavior for constant stress conditions. Grain boundary diffusion produces an increase in the aspect ratio of the matrix grains during deformation and the increased aspect ratio causes a change in creep rate parameters: the stress exponent is decreased from the initial value of 1.0 for equiaxed grains and the grain size exponent is increased from the initial value of 3.0. Accelerated grain growth is also foundmore » by the present simulation.« less
  • A mesoscale kinetic Monte Carlo model is presented to simulate microstructural evolution during sintering of 2D complex microstructures which evolves by grain growth, pore migration and densification. No assumptions about the geometry of the evolving microstructure are made. The results of these simulations are used to generate sintering stress and normalize viscous bulk modulus for use in continuum level simulation of sintering. The advantage of these simulations is that they can be used to generate more accurate parameters as various assumptions regarding geometry and transport mechanism are made. The previous companion paper used the results from the mesoscale simulations tomore » simulate shrinkage and warpage in sintering of bilayer ceramics.« less