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Prediction model for austenite grains growth during reheating process in Ti micro-alloyed cast steel by coupling precipitates dissolution and coarsening behavior

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Journal of Iron and Steel Research International 2019年第2期26卷 162-172页

作者： Tao Liu Mu-jun Long Wen-jie He Deng-fu Chen Zhi-hua Dong Xian-guang Zhang Hua-mei Duan State Key Laboratory of Coal Mine Disaster Dynamics and Control College of Materials Science and EngineeringChongqing UniversityChongqing 400030China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400030China Applied Materials Physics.Department of Materials Science and Engineering KTH-Royal Institute of TechnologyStockholm 10044Sweden Institute for Materials Research Tohoku UniversitySendai 980-8577Japan

A combined model to predict austenite grains growth of titanium micro-alloyed as-cast steel during reheating process was *** model invoIves the behaviors of austenite grains growth in continuous heating process and isothermal soaking process,and the variation of boundary pinning efficiency caused by the dissolution and coarsening kinetics of sec on d-phase particles was also con sidered into the ***,the experimental verificatio ns were performed to examine the prediction power of the *** results revealed that the mean austenite grains size increased with the increase in reheating temperature and soaking time,and the coarsening temperature of austenite grains growth was 1423 K under the current titanium *** addition,the reliability of the predicted results in continuous heating process was validated by continuous heating ***,an optimal regression expression of austenite grains growth in isothermal soaking process was obtained based on the experimental *** compared results indicated that the combined model in conjunction with precipitates dissolution and coarsening kinetics had good reliability and accuracy to predict the austenite grains growth of titanium micro-alloyed casting steel during reheating process.

关键词： Austenite grains growth Reheating process Precipitate dissolution Precipitate coarsening Prediction model

Laser scattering, transmittance and low thermal expansion behaviors in Y2-x（ZnLi）xMo3O12 by forming regular grains

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Chinese Physics B 2019年第9期28卷 320-326页

作者： Xian-Sheng Liu Yong-Guang Cheng Bao-He Yuan Er-Jun Liang Wei-Feng Zhang Henan Key Laboratory of Photovoltaic Materials and Low Dimensional Materials Science Laboratory Henan UniversityKaifeng 475004China College of Science Center of Analysis and Testing of Henan Institute of EngineeringZhengzhou 451191China North China University of Water Resources and Electric Power Zhengzhou 450011China School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministry of Education of China Zhengzhou UniversityZhengzhou 450052China

Ceramics usually have irregular grains, cracking, or porosity, which result in their lightproof.Y2Mo3O12 ceramics have more porosity due to the heavy *** ZnLi to Y2Mo3O12 could form regular grains, reduce cracking and *** increasing the content of ZnLi, the grain shapes self-assembly gradually and then the laser scattering and transmittance *** laser scattering property and transmittance of diverging rays become the best in ceramics Y2-x(ZnLi)xMo3O12(x = 1.0 and 1.2) with regular grains and low thermal *** formation mechanism of regular grains is ascribed to the substitutions of Zn^2+ and Li+for Y^3+ in Y2Mo3O12 resulting in the preferential *** investigation in laser scattering, transmittance and low thermal expansion behaviors of Y2-x(ZnLi)xMo3O12 could pave a way to weaken the strong-laser attack from the high-power laser weapon and the other.

关键词： low thermal expansion laser scattering regular grains diverging rays transmittance

Formation mechanism of large grains inside annealed microstructure of GH4169 superalloy by cellular automation method

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Journal of Materials Science & Technology 2019年第7期35卷 1403-1411页

作者： Ming-Song Chen Zong-Huai Zou Y.C.Lin Hong-Bin Li Guan-Qiang Wang School of Mechanical and Electrical Engineering Central South UniversityChangsha410083China State Key Laboratory of High Performance Complex Manufacturing Changsha410083China College of metallurgies and energy North China Science and Technologies UniversityTangshan063009China

In authors’ previous work [Mater. Charact. 141 (2018) 212-222]. it was found that the heterogeneous deformed microstructures can be replaced by the relatively homogeneous recrystallized grains through an annealing treatment. However, there are still some relatively large recrystallized grains. To find the reasons for the formation of large grains, some new annealing treatment tests were done, and the cellular automation (CA) simulations were carried out in the present work. The experimental results showed that the microstructural evolution during annealing treatment is significantly affected by the content of S phase. So. the effects of δ phase on the nucleation and growth of grains are carefully considered in the CA model to accurately simulate the microstructural evolution behavior. By the CA simulation, it is found that the dislocation density rapidly decreases due to the nucleation of static recrystallization (SRX) and the growth of dynamc recrystallization (DRX) nuclei at the early stage of annealing. The high initial dislocation density provide the high velocity for the growth of DRX nuclei, which is responsible for the formation of coarse grains, However, the growth rate of SRX nuclei is relatively small due to the low dislocation density and pinning effects of δ phase.

关键词： GH4169 superalloy Cellular automation model Coarse grains Annealing treatment Recrystallization behavior

Redevelopment of liftoff rates of saltating sand grains based on a simple optimization model

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Science China Earth Sciences 2010年第4期53卷 568-574页

作者： CHENG Hong & ZOU XueYong State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Beijing 100875,China MOE Engineering Center of Desertification and Blown-sand Control,Beijing Normal University,Beijing 100875,China Key Laboratory of Environmental Change and Natural Disaster of the Ministry of Education of China,Beijing Normal University,Beijing 100875,China 1. State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Beijing 100875 China2. MOE Engineering Center of Desertification and Blown-sand Control Beijing Normal University Beijing 100875 China3. Key Laboratory of Environmental Change and Natural Disaster of the Ministry of Education of China Beijing Normal University Beijing 100875 China

This paper is a redevelopment result of liftoff rates of saltating sand grains based on our previous *** sand flow is a complex multi-phase flow because of a special two-phase gas-solid flow near ground *** extensive research on the movement of blowing sand,no model fully characterizes aeolian sand flow,and large differences often exist between simulations of aeolian sand movement and field *** key problem is a few of sufficient research on liftoff rates of saltating sand grains(also called the number of liftoff sand grains per unit time and per unit bed area).It is necessary to re-search in advance liftoff rates of saltating sand *** redeveloped liftoff rates of saltating sand grains by establishing an optimization model based on the flux of aeolian sand flow at different heights of the sampler in wind tunnel and the simulated capture of saltating sand grains by different heights of the sampler that are from different liftoff position(distance from the sampler) in order to revise previous inversion condition of liftoff rates of saltating sand *** rates increased rapidly with increasing wind *** frictional wind velocities of u=0.67,0.77,0.82,0.83,and 0.87 m s-1,liftoff rates were 3840,954502,5235114,5499407,and 7696291 sand grain s-1 m-2,*** rates could be expressed as the square of the instantaneous frictional wind velocity and a constant(0.663) that differs from the critical(threshold) frictional wind velocity at which saltation *** our results require additional experimental validation and the simple optimization model must be improved,they nonetheless provide a strong basis for future research.

关键词： liftoff rates of saltating sand grains optimization model wind tunnel two-phase gas-solid flow

Multi-gene engineering boosts oil content in rice grains

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Plant Communications 2024年第2期5卷 15-18页

作者： Xixi Liu Zhiyong Li Jiezheng Ying Yazhou Shu Wanning Liu Guanghao Li Lijuan Chen Jinjin Luo Shiyi Wang Yifeng Wang Xiaohong Tong Jie Huang Hao Du Jian Zhang State Key Laboratory of Rice Biology and Breeding China National Rice Research InstituteHangzhou 311400China College of Agriculture and Biotechnology Zhejiang UniversityHangzhouChina

Dear Editor,Lipids are the essential building blocks of cellular membranes and act as signaling molecules to modulate various biological processes such as membrane remodeling and intracellular organelle *** addition,lipids serve as storage forms of carbon and energy for the human diet(Suh et al.,2022).Because global consumption of plant-derived oils is estimated to reach 249 million tons by 2031,improvements in the yield of vegetable oils are urgently needed(OECD,2022).

关键词： boost grains content

Antioxidant capacity and phytochemical content of 16 sources of corn distillers dried grains with solubles(DDGS)

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Animal Nutrition 2018年第4期4卷 435-441页

作者： Eui-Cheol Shin Gerald C.Shurson Daniel D.Gallaher Department of Food Science and Nutrition University of Minnesota Department of Animal Science University of Minnesota

Corn distillers dried grains with solubles(DDGS) is a co-product of the fuel ethanol industry that is an excellent source of energy, digestible amino acids, and digestible phosphorus. However, the antioxidant capacity and phytochemical content of DDGS and how it is influenced by production parameters is unknown. Therefore, 16 DDGS samples obtained from different ethanol production plants in the *** characterized for antioxidant capacity, vitamin E, xanthophylls, and ferulic acid content and compared with corn. The antioxidant capacity of DDGS samples, measured using the 2,2-diphenyl-lpicrylhydrazyl(DPPH) assay, varied almost 2 folds among samples, but in all cases was more than 3 times that of corn. All DDGS samples had a considerably greater concentration of tocopherols and tocotrienols(lipid-soluble antioxidants) than corn. However, the relative concentrations among the tocopherols and tocotrienols tended to be similar to corn. The xanthophyll lutein was present in all DDGS samples and in all cases exceeded the content in corn. Zeaxanthin was detected in most samples. The total ferulic acid content of the DDGS samples was almost 3-fold greater than corn, but, as in corn, almost all was present in a bound form. However, the concentration of unbound(free) ferulic acid was more than 3 times the concentration found in the corn sample. Thus, DDGS is a rich source of phytochemical compounds and may provide antioxidant and health benefits beyond its macronutrient composition. However, differences in processing can greatly influence the phytochemical content and quality of DDGS. In particular,thermal abuse due to excessive heat used in drying may lead to lipid oxidation products that may have deleterious effects when incorporated into feeds.

关键词： Corn distillers dried grains with solubles Vitamin E Ferulic acid Xanthophylls Lutein Antioxidant capacity

The trajectory parameters analysis of saltating sand grains driven by wind

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Chinese Science Bulletin 1999年第18期44卷 1681-1685页

作者： Xueyong Zou Qingzhen Hao Chunlai Zhang Bao Yang Yuzhang Liu Guangrong Dong Shaoxiang Zhou Chinese Acad Sci Desert Res Inst Lanzhou 730000 Peoples R China Univ Sci & Technol China Dept 9 Hefei 230026 Peoples R China

The study of trajectory parameters of saltating sand grains is of great importance to forming the kinematic theory of wind-sand current. By establishing the simplified theoretical pattern and probing into the relationship between lift-off angle (α) and landing angle (β), relationship between the ratio of saltation length ( L) to maximum height (H) and lift-off angle as

关键词： wind-sand flow trajectory parameters saltating sand grains high-speed multiflash photography.

Nanometer-sized passageways within CuTCNQ crystalline grains prepared by spontaneous electrolyses

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Chinese Science Bulletin 1995年第11期40卷 962-966页

作者：顾宁鲁武韦钰 Laboratory of Wu Chien-shiung Southeast University Nanjing 210096 China

Since R. S. Potember and his co-operators reported in 1979 that there was a cur-rent-controlled bistable electrical switching phenomenon in the copper charge-transfer (CT)comples of 7, 7’, 8, 8’-tetracyanoquinodimethane (TCNQ), electric, optoelectronic threshold-switching and memory effects have been found in succession within the copper and silverCT complexes of TCNQ and its derivatives. These potential characteristics usually corre-spond to a field-induced partial phase transition in material that generates either a

关键词： atomic force microscope (AFM) CuTCNQ organic thin films crystalline grains spontaneous electrolyses.

Changes in wheat starch grains using different cooking methods: Insights into ancient food processing techniques

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科学通报 2013年第S1期58卷 82-89页

作者： DAI Ji YANG YiMin WANG Bo WANG ChangSui JIANG HongEn Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of Sciences Department of Scientific History and Archaeometry University of Chinese Academy of Sciences Xinjiang Uygur Autonomous Region Museum

We investigate the morphological changes in starch grains from wheat(Triticum aestivum) using different cooking methods(boiling, steaming, frying, and baking). We compare the cooked starch grains with starch grains from ancient wheat flour cakes(Astana Cemetery, Turpan Basin, Xinjiang, China) to determine the cooking techniques used by people in Xinjiang 1200 years ago. Heat and water content affect starch grains when different cooking methods are used. Boiling and steaming results in the collapse of wheat starch grains accompanied by extreme swelling, curved granules, pasting, almost full gelatinization, a distinct extinction cross and vague granule outlines. Frying and baking cause less swelling, fewer curved granules, less pasting and only partial gelatinization of wheat starch grains, but the extinction lines are still distinct and the outlines of granules relatively clear. The pale brown substances on the starch grains make starch from baked-wheat products distinct from those cooked using other methods.

关键词： cooking experiments food processing starch grains analysis Triticum aestivum