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three-dimensional morphology and Growth Behavior of Ferrite Allotriomorphs Formed at Grain Boundary Edges

Journal of Iron and Steel Research International 2010年第11期17卷 49-53页

作者： WAN Xiang-liang CHENG Lin WU Kai-ming International Research Institute of Steel Technology Wuhan University of Science and Technology Wuhan 430081 Hubei China

three-dimensional morphology of ferrite allotriomorphs nucleated at grain boundary edges in low carbon steel was revealed by means of serial sectioning in conjunction with computer-aided three-dimensional reconstruction techniques. The typical morphology of them was of an elongated triangular pyramid. The length, width and thickness of ferrite allotriomorphs were measured on the basis of three-dimensional reconstructed images. The aspect ratio （length/width） of them was 4.5 on an average and scattered from 3 to 6. The measured sizes were smaller than calculated ones, which was probably attributed to solute drag-like effect of manganese in the alloy.

关键词： steels ferrite allotriomorph three-dimensional morphology growth kinetics

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Nucleation and three-dimensional morphology of intragranular ferrite in a vanadium microalloyed steel

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Journal of University of Science and Technology Beijing 2005年第4期12卷 326-328页

作者： Kaiming Wu Xinlai He Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China Lab of three-dimensional Analysis and Characterization of Materials Microstructure Hubei Province Key Laboratory for Refractory and Ceramics-Ministry-Province Jointly-constructed Cultivation Base for State Key Laboratory Wuhan University of Science and Technology Wuhan 430081 China

The formation of intragranular ferrite at inclusions was analyzed by SEM-EDX in a vanadium microalloyed steel with an excess amount of sulfur. The precipitation of MnS at aluminum oxides may result in Mn depletion, which, in turn, promotes the formation of intragranular ferrite. The morphology of intragranular ferrite changed with undercooling. At higher temperatures intragranular ferrite is nearly equiaxed whereas it is plate-like at lower temperatures.

关键词： microalloyed steels intragranular ferfite nucleation three-dimensional morphology

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three-dimensional morphology of Intragranular Ferrite in an Fe-C-Mn Alloy

Three-dimensional Morphology of Intragranular Ferrite in an ...

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第二届全国背散射电子衍射（EBSD）技术及其应用学术会议暨第六届全国材料科学与图像科技学术会议

作者： L.Cheng~1 Z.G.Li~2 K.M.Wu~1 1 Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Department of Applied Physics,Wuhan University of Science and Technology,Wuhan 430081,China. 2 Technology Center,Baosteel Group,Shanghai 201900,China

Intragranular ferrite is an important microstructure in the transformation of weld metals, pipeline steels and other structural *** has a very good combination of high strength and toughness. three-dimensional morphology of intragranular ferrite idiomorphs and plates or laths nucleated at inclusions in an Fe-0.09%C-1.48%Mn alloy was revealed by means of computer-aided three-dimensional reconstruction technique. Specimens were austenitized at 1250℃ under a purified argon atmosphere and isothermally reacted in a salt bath at temperatures ranging from 690℃ to 610℃.The specimens were polished with an automatic grinder polisher,then etched with 3% *** hardness indents were applied using a hardness tester with a Vickers hardness *** polishing,etching and hardness indenting a series of digital optical micrographs were *** digital image was aligned and processed by Scion Image and Adobe Photoshop,*** images were transferred into a volume data set by ImgToVol,and then was visualized using AVS software. 3D reconstruction shows that intragranular ferrite are formed on *** morphology of intragranular ferrite changes with *** higher temperatures(low undercooling) intragranular ferrite appeared to be an equiaxed *** lower temperatures(high undercooling) intragranular ferrite appeared to be a plate or a lath.

关键词： Steels Microstructure Intragranualr Ferrite three-dimensional morphology

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Influence of forming process on three-dimensional morphology of TiB_2 particles in Al-Ti-B alloys

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Transactions of Nonferrous Metals Society of China 2012年第3期22卷 564-570页

作者：李鹏廷李云国聂金凤刘相法山东大学材料液固结构演变与加工教育部重点实验室济南250061

A series of Al-Ti-B master alloys were prepared by different preparation routes,and the TiB2 particles in the master alloys were extracted and *** is found that the forming process has significant influence on the three-dimensional morphology of TiB2 *** preparation routes result in different reaction forms,which accounts for the morphology variation of TiB2 *** the Al-Ti-B master alloy is prepared using ＂halide salt＂ route,TiB2 particles exhibit hexagonal platelet morphology and are independent with each *** addition,the reaction temperature almost does not have influence on the morphology of TiB2 ***,TiB2 particles exhibit different morphologies at different reaction temperatures when the master alloys are prepared with Al-3B and Ti *** the master alloy is prepared at 850 ℃,a kind of TiB2 particle agglomeration forms with a size larger than 5 μ*** TiB2 particles change to layered stacking morphology even dendritic morphology with the reaction temperature reaching up to 1200 ℃.

关键词： Al-Ti-B alloy TiB2 forming process three-dimensional morphology

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Modelling of an obliquely deposited thin film in three dimensions by kinetic Monte Carlo method

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Chinese Physics B 2004年第12期13卷 2115-2120页

作者：刘祖黎张雪锋姚凯伦魏合林黄运米 DepartmentofPhysics HuazhongUniversityofScienceandTechnologyWuhan430074China

A simulation of the growth of an obliquely deposited thin film in a three-dimensional lattice was made using kinetic Monte Carlo method. Cu growth in three dimensions on a (001) substrate with high deposition rates has been simulated in this model. We mainly investigated the variation of three-dimensional morphology and microstructure of films with incidence angle of sputtered flux. The relation of roughness and densities of films with incidence angle was also investigated. The simulation results show that the surface roughness increases and the relative density of thin film decreases with increasing incidence angle, respectively; the columnar structures were separated by void regions for large incidence angle and high deposition rate. The simulation results are in good agreement with experimental ***, the orientation angle of columns is not completely consistent with the classical tangent rule.

关键词： kinetic Monte Carlo method oblique deposition three-dimensional morphology microstructure

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Experimental Study on Shear Mechanical Properties and Section morphology of Coal Samples

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World Journal of Engineering and Technology 2023年第2期11卷 335-352页

作者： Sihao Huang Tingkan Lu Baohua Guo School of Energy Science and Engineering Henan Polytechnic University Jiaozuo China

The mechanical properties of rocks under cyclic and dynamic loading are important research topics for solving the structural stability of large engineering rocks. As underground mining in coal mines goes deeper, ground stresses are increasing and instability damage of coal rocks by shear loading is frequent. Therefore, in order to investigate the shear mechanical properties and section morphological characteristics of intact coal samples in the direct shear test, the RDS-200 rock direct shear instrument was used to carry out direct shear tests on intact coal samples under different normal stresses, and the shear section was scanned for three-dimensional morphology. The results show that: 1) from the strength characteristics, the peak shear strength of the coal samples increased linearly with increasing normal stress, and the residual shear strength increased logarithmically. 2) In terms of deformation characteristics, the peak shear displacement of the coal sample increases linearly with increasing normal stress, the pre-peak shear stiffness increases logarithmically, and the residual normal displacement decreases linearly. 3) From the morphological characteristics of the shear surface, with the increase of normal stress, the section transitions from high-order undulating to flattening type. The maximum height of the fracture surface profile and kurtosis coefficient of the shear section decreased linearly, and the profile area ratio and root mean square of slope decreased as a power function, i.e. the higher the normal stress, the smaller the undulation of the section, the sharpness of the roughness shape and the roughness coefficient JRC, and the flatter and smoother the section. The findings of this study can help to provide some reference for the evaluation of shear instability occurring in coal bodies under different normal stresses.

关键词： Coal Shear Test Normal Stress Shear Section three-dimensional morphology

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