Number of the records: 1
Influence of Finite Mobilities of Triple Junctions on the Grain Morphology and Kinetics of Grain Growth
- 1.
SYSNO ASEP 0525063 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Influence of Finite Mobilities of Triple Junctions on the Grain Morphology and Kinetics of Grain Growth Author(s) Gamsjaeger, E. (AT)
Gschoepf, B. (AT)
Svoboda, Jiří (UFM-A) RID, ORCIDNumber of authors 3 Article number 185 Source Title Metals. - : MDPI
Roč. 10, č. 2 (2020)Number of pages 20 s. Language eng - English Country CH - Switzerland Keywords solute drag ; size distributions ; boundary segregation ; local equilibrium ; interface ; motion ; ferrite ; recrystallization ; simulations ; transition ; triple junction mobilities ; grain topology ; vertex model ; microalloyed steels Subject RIV BJ - Thermodynamics OECD category Thermodynamics R&D Projects EF16_025/0007304 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UFM-A - RVO:68081723 UT WOS 000522450800030 EID SCOPUS 85078853573 DOI 10.3390/met10020185 Annotation Grain boundary networks composed of equal microstructural elements were investigated in a recent paper. In this work a more complicated artificial grain topology consisting of one four-sided, two six-sided and one eight-sided grain is designed to further investigate the influence of grain boundary and triple junction mobilities on the kinetics of the system in more detail. Depending on the value of the equal mobility of all triple junctions, the initially square-shaped four-sided grain changes its shape to become more or less rectangular. This indicates that the grain morphology is influenced by the value of the mobility of the triple junctions. It is also demonstrated that a grain arrangement with low mobility triple junctions controlling the kinetics of grain growth enhances growth of the large eight-sided grains. In addition, grain growth is investigated for different values of mobilities of triple junctions and grain boundaries. A strong elongation of several grains is predicted by the modeling results for reduced mobilities of the microstructural grain boundary elements. The two-dimensional modeling results are compared to micrographs of a heat-treated titanium niobium microalloyed steel. This feature, namely the evolution of elongated grains, is observed in the micrograph due to the pinning e ffect of (Ti, Nb)C precipitates at elevated soaking temperatures of around 1100 degrees C. Furthermore, the experiments show that a broader distribution of the grain sizes occur at 1100 degrees C compared to soaking temperatures, where pinning due to precipitates plays a less prominent role. A widening of the distribution of the grain sizes for small triple junction mobilities is also predicted by the unit cell model. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2021 Electronic address https://www.mdpi.com/2075-4701/10/2/185
Number of the records: 1