نتایج جستجو برای: microstructure analysis

تعداد نتایج: 2857885  

پایان نامه :وزارت علوم، تحقیقات و فناوری - پژوهشگاه مواد و انرژی - پژوهشکده سرامیک 1392

thermal barrier coatings (tbcs) are used to provide thermal insulation to the hot section components of gas turbines in order to enhance the operating temperature and turbine efficiency. hot corrosion and thermal shocks are the main destructive factors in tbcs which comes as a result of oxygen and molten salt diffusion into the coating. in this thesis atmospheric plasma spraying was used to dep...

Journal: :iranian journal of materials forming 2015
m. seyed salehi n. anjabin r. mansoori

in the present study, the microstructural changes of a nickel based superalloy nimonic80a during a non-isothermal deformation were studied. therefore, microstructure evolutionduring hot side pressing test was predicted with combined methods of finite element analysis andprocessing map of the material. the predicted results were validated through experimentalmicrostructural studies. the results ...

This study was performed to recognize the loess texture in Golestan Province, Iran using the microstructure analysis according to the electron microscopic images. Loess microstructure study allows for investigating the characteristics of particle shape, fabric, cement and porosity in microscopic images. In recent years, computer analysis has been replaced with manual calculation due to its high...

2010
Pattan Prakash V. D. Mytri P. S. Hiremath Milan Sonka Vaclav Hlavac Roger Boyle Michael Kass Andrew Witkin

A critical and important stage in microstructure image analysis is segmentation, because the segmentation method has direct impact on the end results of analysis. The main aim of this paper is to determine appropriate segmentation method for microstructure image analysis and quantification. In this work, some popular segmentation methods, namely, Otsu’s automatic threshold, watershed, uni-grid ...

H. Moslemi Naeini, M. Maerefat and M. Soltanpour,

In hot forming process, the workpiece undergoes plastic deformation at high temperature and the microstructure of the workpiece changes according to the plastic deformation. These changes affect the mechanical properties of workpiece. In order to optimize this process, both the plastic deformation of workpiece and its microstructural changes should be taken into consideration. Since material be...

2005
C. S. Campbell

Many oi the observed but yet unexplained phenomena associated with granular flow have been attributed to the development of a layered microstructure within the material. In particular the microstructure development has been called on to explain ma, ny of the experimental observations that cannot be accounted for in the presently avMlable theoreticM studies. While the attributions are based on s...

2016
Peng Peng Xinzhong Li Jiangong Li Yanqing Su Jingjie Guo

An oscillatory microstructure has been observed during deep-cellular growth of directionally solidified Sn-36at.%Ni hyperperitectic alloy containing intermetallic compounds with narrow solubility range. This oscillatory microstructure with a dimension of tens of micrometers has been observed for the first time. The morphology of this wave-like oscillatory structure is similar to secondary dendr...

2016
Felix K. Kopp Konstantin Holzapfel Thomas Baum Radin A. Nasirudin Kai Mei Eduardo G. Garcia Rainer Burgkart Ernst J. Rummeny Jan S. Kirschke Peter B. Noël

We investigated the effects of low-dose multi detector computed tomography (MDCT) in combination with statistical iterative reconstruction algorithms on trabecular bone microstructure parameters. Twelve donated vertebrae were scanned with the routine radiation exposure used in our department (standard-dose) and a low-dose protocol. Reconstructions were performed with filtered backprojection (FB...

Journal: :Magnetic resonance in medicine 2007
Shinya Handa Sadanori Tomiha Tomoyuki Haishi Katsumi Kose

A compact MRI system for trabecular bone (TB) microstructure measurements of the distal radius was developed using a 1.0 T permanent magnet and a compact MRI console. TB microstructure of the distal radius was clearly visualized using a three-dimensional (3D) driven equilibrium spin-echo (DESE) sequence in 23 min. The image obtained had a sufficient spatial resolution (150 microm x 150 microm x...

H. Moslemi Naeini, M. Maerefat and M. Soltanpour,

In hot forming process, the workpiece undergoes plastic deformation at high temperature and the microstructure of the workpiece changes according to the plastic deformation. These changes affect the mechanical properties of workpiece. In order to optimize this process, both the plastic deformation of workpiece and its microstructural changes should be taken into consideration. Since material be...

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