Avoiding abnormal grain growth when annealing selective laser melted pure titanium by promoting nucleation

2022 ◽  
Vol 209 ◽  
pp. 114377
Author(s):  
Kewei Chen ◽  
De Jun Huang ◽  
Hua Li ◽  
Ning Jia ◽  
Warren Chong
Keyword(s):  
Grain Growth ◽  
Pure Titanium ◽  
Abnormal Grain Growth

Abnormal grain growth in commercially pure titanium during additive manufacturing with electron beam melting

Materialia ◽  
2019 ◽  
Vol 6 ◽  
pp. 100281 ◽  
Author(s):  
Kenta Yamanaka ◽  
Wataru Saito ◽  
Manami Mori ◽  
Hiroaki Matsumoto ◽  
Shigeo Sato ◽  
...  
Keyword(s):  
Electron Beam ◽  
Additive Manufacturing ◽  
Grain Growth ◽  
Electron Beam Melting ◽  
Pure Titanium ◽  
Abnormal Grain Growth ◽  
Commercially Pure Titanium ◽  
Commercially Pure

Grain Refinement in Titanium-Erbium Alloys

1974 ◽  
Vol 32 ◽  
pp. 522-523
Author(s):  
B. B. Rath ◽  
J. E. O'Neal ◽  
R. J. Lederich
Keyword(s):  
Electron Microscopy ◽  
Size Distribution ◽  
Grain Refinement ◽  
Grain Growth ◽  
Volume Fraction ◽  
Pure Titanium ◽  
Systematic Investigation ◽  
Second Phase ◽  
Titanium Matrix ◽  
Average Size

Addition of small amounts of erbium has a profound effect on recrystallization and grain growth in titanium. Erbium, because of its negligible solubility in titanium, precipitates in the titanium matrix as a finely dispersed second phase. The presence of this phase, depending on its average size, distribution, and volume fraction in titanium, strongly inhibits the migration of grain boundaries during recrystallization and grain growth, and thus produces ultimate grains of sub-micrometer dimensions. A systematic investigation has been conducted to study the isothermal grain growth in electrolytically pure titanium and titanium-erbium alloys (Er concentration ranging from 0-0.3 at.%) over the temperature range of 450 to 850°C by electron microscopy.

On the Abnormal Grain Growth in Pure Magnesium

2018 ◽  
Author(s):  
Risheng Pei ◽  
Sandra Korte-Kerzel ◽  
Talal Al-Samman
Keyword(s):  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Pure Magnesium

scholarly journals Precipitation Criterion for Inhibiting Austenite Grain Coarsening during Carburization of Al-Containing 20Cr Gear Steels

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 504
Author(s):  
Huasong Liu ◽  
Yannan Dong ◽  
Hongguang Zheng ◽  
Xiangchun Liu ◽  
Peng Lan ◽  
...  
Keyword(s):  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Grain Structure ◽  
Pinning Force ◽  
Grain Coarsening ◽  
Zener Pinning ◽  
Austenite Grain ◽  
Composition Optimization ◽  
Gear Steels ◽  
Grain Growth Behavior

AlN precipitates are frequently adopted to pin the austenite grain boundaries for the high-temperature carburization of special gear steels. For these steels, the grain coarsening criterion in the carburizing process is required when encountering the composition optimization for the crack-sensitive steels. In this work, the quantitative influence of the Al and N content on the grain size after carburization is studied through pseudocarburizing experiments based on 20Cr steel. According to the grain structure feature and the kinetic theory, the abnormal grain growth is demonstrated as the mode of austenite grain coarsening in carburization. The AlN precipitate, which provides the dominant pinning force, is ripened in this process and the particle size can be estimated by the Lifshitz−Slyosov−Wagner theory. Both the mass fraction and the pinning strength of AlN precipitate show significant influence on the grain growth behavior with the critical values indicating the grain coarsening. These criteria correspond to the conditions of abnormal grain growth when bearing the Zener pinning, which has been analyzed by the multiple phase-field simulation. Accordingly, the models to predict the austenite grain coarsening in carburization were constructed. The prediction is validated by the additional experiments, resulting in accuracies of 92% and 75% for the two models, respectively. Finally, one of the models is applied to optimize the Al and N contents of commercial steel.

Orientation mapping linked to fractal analysis: A method for studying abnormal grain growth in nanocrystalline PdAu

2020 ◽  
Vol 128 (18) ◽  
pp. 185109
Author(s):  
Christian Braun ◽  
Raphael A. Zeller ◽  
Hanadi Menzel ◽  
Jörg Schmauch ◽  
Carl E. Krill ◽  
...  
Keyword(s):  
Grain Growth ◽  
Fractal Analysis ◽  
Abnormal Grain Growth ◽  
Orientation Mapping

scholarly journals Mean Field Analysis of Orientation Selective Grain Growth Driven By Interface-Energy Anisotropy

1994 ◽  
Vol 343 ◽  
Author(s):  
J. A. Floro ◽  
C. V. Thompson
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Growth ◽  
Texture Evolution ◽  
Mean Field ◽  
Orientation Distribution ◽  
Interface Energy ◽  
Abnormal Grain Growth ◽  
Field Analysis ◽  
Energy Anisotropy

ABSTRACTAbnormal grain growth is characterized by the lack of a steady state grain size distribution. In extreme cases the size distribution becomes transiently bimodal, with a few grains growing much larger than the average size. This is known as secondary grain growth. In polycrystalline thin films, the surface energy γs and film/substrate interfacial energy γi vary with grain orientation, providing an orientation-selective driving force that can lead to abnormal grain growth. We employ a mean field analysis that incorporates the effect of interface energy anisotropy to predict the evolution of the grain size/orientation distribution. While abnormal grain growth and texture evolution always result when interface energy anisotropy is present, whether secondary grain growth occurs will depend sensitively on the details of the orientation dependence of γi.

Microstructural characterization of abnormal grain growth behavior of Al-doped ZnO in thin film solar cells

2012 ◽  
Vol 44 (11-12) ◽  
pp. 1427-1430
Author(s):  
Hui-Youn Shin ◽  
M. H. Joo ◽  
S. K. Moon ◽  
T. H. Moon ◽  
K. H. Park
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Grain Growth ◽  
Microstructural Characterization ◽  
Growth Behavior ◽  
Abnormal Grain Growth ◽  
Thin Film Solar Cells ◽  
Doped Zno ◽  
Grain Growth Behavior

Effects of barrier layer and annealing on abnormal grain growth in copper thin films

1994 ◽  
Vol 76 (8) ◽  
pp. 4516-4523 ◽  
Author(s):  
E. M. Zielinski ◽  
R. P. Vinci ◽  
J. C. Bravman
Keyword(s):  
Thin Films ◽  
Grain Growth ◽  
Barrier Layer ◽  
Abnormal Grain Growth

Abnormal Grain Growth in Alumina

1996 ◽  
Vol 204-206 ◽  
pp. 485-490 ◽  
Author(s):  
I.J. Bae ◽  
S. Baik
Keyword(s):  
Grain Growth ◽  
Abnormal Grain Growth
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