scholarly journals Effect of annealing process on the abnormal grain growth behavior during carburizing of 20CrMnTi steel

2020 ◽  
Vol 7 (4) ◽  
pp. 046504 ◽  
Author(s):  
Tao Jia ◽  
Jian Huang ◽  
Haojie Wang ◽  
Zhaodong Wang
Keyword(s):  
Grain Growth ◽  
Annealing Process ◽  
Growth Behavior ◽  
Abnormal Grain Growth ◽  
Grain Growth Behavior

The Effects of Nb Carbo-Nitride Precipitation Conditions on Abnormal Grain Growth in Nb Added Steels

2007 ◽  
Vol 539-543 ◽  
pp. 4167-4172 ◽  
Author(s):  
Toshio Murakami ◽  
Hitoshi Hatano ◽  
Yosuke Shindo ◽  
Mutsuhiro Nagahama ◽  
Hiroshi Yaguchi
Keyword(s):  
Grain Growth ◽  
Ostwald Ripening ◽  
Growth Behavior ◽  
Abnormal Grain Growth ◽  
Pinning Force ◽  
Austenite Grain Size ◽  
Austenite Grain ◽  
Ripening Rate ◽  
Grain Growth Behavior ◽  
Nitride Precipitation

In order to investigate the effects of Nb carbo-nitride precipitation conditions on abnormal grain growth behavior during high temperature carburizing, size of Nb carbo-nitride precipitates was controlled by precipitation treatment at 1173-1273K for 0.6-54ks, and the specimens were quasi-carburized at 1323K. Abnormal grain growth was enhanced when the size of Nb precipitates was fine or coarse, so there is a suitable size range in Nb precipitates to suppress abnormal grain growth. The reason why abnormal grain growth was enhanced is the lack of pinning force as the conventional theory proposed by Hillert or Gladman; however, it cannot be explained by this theory that small precipitates promote abnormal grain growth. It is considered that Ostwald ripening rate of precipitates is also an important factor in controlling abnormal grain growth in addition to the amount and size of precipitates and austenite grain size, which were parameters in the Gladman‘s theory on abnormal grain growth behavior.

Development of Abnormal Grain Growth in Cold Rolled and Recrystallized AA 5182 Sheet

2006 ◽  
Vol 116-117 ◽  
pp. 316-319 ◽  
Author(s):  
Han Gil Suk ◽  
E.J. Shin ◽  
Moo Young Huh
Keyword(s):  
Grain Boundaries ◽  
Grain Growth ◽  
Growth Behavior ◽  
Abnormal Grain Growth ◽  
Annealing Temperatures ◽  
Cold Rolled ◽  
Grain Growth Behavior

Grain growth in the cold rolled and subsequently recrystallized AA 5182 sheets was investigated by means of microstructure observations and texture measurements. Grain growth behavior strongly depends on the annealing temperatures. Grain growth hardly took place at temperatures lower than 470°C, which is attributed to a low mobility of grain boundaries. Abnormal grain growth occurred at temperatures ranging from 480 to 530°C. Annealing above 560°C gave rise to the dissolution of inhibitor precipitates, which led to normal grain growth.

Analysis of abnormal grain growth behavior during hot-press sintering of boron carbide

2020 ◽  
Vol 46 (10) ◽  
pp. 16345-16353 ◽  
Author(s):  
Mei Zhang ◽  
Zhihui Zhou ◽  
Tiechui Yuan ◽  
Ruidi Li ◽  
Weishan Zhang ◽  
...  
Keyword(s):  
Boron Carbide ◽  
Grain Growth ◽  
Growth Behavior ◽  
Abnormal Grain Growth ◽  
Hot Press ◽  
Grain Growth Behavior ◽  
Hot Press Sintering

Comparison of Abnormal Grain Growth Behavior of Lead-Free (Na,K)NbO3-M(Cu,Nb)O3, (M = Ca, Sr, Ba) Piezoelectric Ceramics

2020 ◽  
Vol 30 (7) ◽  
pp. 343-349
Author(s):  
Seungwoon Jung ◽  
Ji-Ho Lim ◽  
Han-Bo Jung ◽  
Sung-Yub Ji ◽  
Seunggon Choi ◽  
...  
Keyword(s):  
Grain Growth ◽  
Piezoelectric Ceramics ◽  
Growth Behavior ◽  
Abnormal Grain Growth ◽  
Lead Free ◽  
Grain Growth Behavior

Abnormal grain growth behavior of an

1987 ◽  
Vol 18 (5) ◽  
pp. 777-784 ◽  
Author(s):  
K. Mino ◽  
Y. G. Nakagawa ◽  
A. Ohtomo
Keyword(s):  
Grain Growth ◽  
Growth Behavior ◽  
Abnormal Grain Growth ◽  
Grain Growth Behavior

Step Free Energy Change and Microstructural Development in BaTiO3-SiO2

2007 ◽  
Vol 352 ◽  
pp. 25-30 ◽  
Author(s):  
Jaem Yung Chang ◽  
Suk Joong L. Kang
Keyword(s):  
Free Energy ◽  
Grain Growth ◽  
Driving Force ◽  
Growth Behavior ◽  
Abnormal Grain Growth ◽  
Free Energy Change ◽  
Energy Change ◽  
Microstructural Development ◽  
Two Phase ◽  
Grain Growth Behavior

The effect of step free energy on the grain growth behavior in a liquid matrix is studied in a model system BaTiO3-SiO2. BaTiO3-10SiO2 (mole %) powder compacts were sintered at 1280°C under various oxygen partial pressures (PO2), 0.2, ~ 10-17 and ~ 10-24 atm. As the step free energy decreases with the reduction of PO2, it was possible to observe the change in growth behavior with the reduction of the step free energy. At PO2 = 0.2 atm, essentially no grain growth (stagnant grain growth) occurred during sintering up to 50 h. At PO2 ≈ 10-17 atm, abnormal grain growth followed stagnant grain growth during extended sintering (incubation of abnormal grain growth). At PO2 ≈ 10-24 atm, normal grain growth occurred. These changes in growth behavior with PO2 and the step free energy reduction are explained in terms of the change in the critical driving force for appreciable growth relative to the maximum driving force for grain growth. The present experimental results provide an example of microstructure control in solid-liquid two- phase systems via step free energy change.

scholarly journals The Effect of Ethanol on Abnormal Grain Growth in Copper Foils

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3069
Author(s):  
Zhancheng Li ◽  
Yongna Zhang ◽  
Yinwu Duan ◽  
Deping Huang ◽  
Haofei Shi
Keyword(s):  
Single Crystal ◽  
Grain Growth ◽  
Copper Foil ◽  
Growth Behavior ◽  
Abnormal Grain Growth ◽  
Recrystallization Process ◽  
Annealing Atmosphere ◽  
Large Area ◽  
Copper Foils ◽  
Grain Growth Behavior

Single-crystal Cu not only has high electrical and thermal conductivity, but can also be used as a promising platform for the epitaxial growth of two-dimensional materials. Preparing large-area single-crystal Cu foils from polycrystalline foils has emerged as the most promising technique in terms of its simplicity and effectiveness. However, the studies on transforming polycrystalline foil into large-area single-crystal foil mainly focus on the influence of annealing temperature and strain energy on the recrystallization process of copper foil, while studies on the effect of annealing atmosphere on abnormal grain growth behavior are relatively rare. It is necessary to carry out more studies on the effect of annealing atmosphere on grain growth behavior to understand the recrystallization mechanism of metal. Here, we found that introduction of ethanol in pure argon annealing atmosphere will cause the abnormal grain growth of copper foil. Moreover, the number of abnormally grown grains can be controlled by the concentration of ethanol in the annealing atmosphere. Using this technology, the number of abnormally grown grains on the copper foil can be controlled to single one. This abnormally grown grain will grow rapidly to decimeter-size by consuming the surrounding small grains. This work provides a new perspective for the understanding of the recrystallization of metals, and a new method for the preparation of large-area single-crystal copper foils.

Abnormal Grain Growth Mechanism in Alumina

2006 ◽  
Vol 510-511 ◽  
pp. 474-477 ◽  
Author(s):  
Hee Gon Bang ◽  
Jun Ho Song ◽  
Sang Yeup Park
Keyword(s):  
Grain Growth ◽  
Porous Alumina ◽  
Growth Behavior ◽  
Abnormal Grain Growth ◽  
Main Role ◽  
Sintering Process ◽  
Nucleation Stage ◽  
Small Grains ◽  
Grain Growth Behavior

During the sintering process, the onset of abnormal grain growth is depend on various factors. The abnormal grain growth behavior, however, was focused only the growth stage compared to nucleation stage. Because most of abnormal grain growth occurred to a rapid mode, the observation of abnormal grain growth was impossible. In this study, we intend to in-situ observe the nucleation stage of abnormal grain using porous alumina. As a result, the liquid phase due to unintended impurities plays a main role for the formation of abnormal nuclei by the rearrangement of small grains due to the capillary force.

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