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Online since: August 2017
Authors: Huan Fang Gao, Gui Ying Xu, Guo Wen Huang, De Wen Zhou
Instead of making a specific parameter attribute of distiller grain biomass material, current researches based on existing material all approximate biomass powder to ideal elastomer.
This simulation regards distiller grain biomass as the compressible continuum with characteristics of isotropy and homogeneity.
Table 1 Material Parameter and Number Material Category and Number Item Value 1.
Biomass (Distiller Grain) Density (kg/m3) 430 Elasticity Modulus (GPa) 16 Poisson’s Ratio 0.3 2.
Fig.10 is the contact stress diagram of distiller grain powder and mold, which shows that, during the process of biomass particle molding, contact stress decreases gradually from top to bottom.
This simulation regards distiller grain biomass as the compressible continuum with characteristics of isotropy and homogeneity.
Table 1 Material Parameter and Number Material Category and Number Item Value 1.
Biomass (Distiller Grain) Density (kg/m3) 430 Elasticity Modulus (GPa) 16 Poisson’s Ratio 0.3 2.
Fig.10 is the contact stress diagram of distiller grain powder and mold, which shows that, during the process of biomass particle molding, contact stress decreases gradually from top to bottom.
Online since: April 2015
Authors: Jie Yu Zhang, Yan Ling Guo, Hai Zhao, Lei Tang, Yao Jie Wang
The threshold is significantly dependent on the microstructures, such as porosity, grain size and orientation [14, 15].
The larger number and smaller size of pores are observed in this sample compared to the others.
Increasing molybdenum particle size, the molybdenum clusters become larger and the number of pores decreases.
That makes the grain growth of molybdenum more difficult.
The densification and grain growth of ZrO2-Mo cermet is worth further investigation.
The larger number and smaller size of pores are observed in this sample compared to the others.
Increasing molybdenum particle size, the molybdenum clusters become larger and the number of pores decreases.
That makes the grain growth of molybdenum more difficult.
The densification and grain growth of ZrO2-Mo cermet is worth further investigation.
Online since: October 2010
Authors: Guang Ming Li, Li Yan, Shu Min Yu
In
this case, the original austenite grain size is only grade 9 and hardness of sample is HRC60.5.
The martensite, undissolved carbide and retained austenite were obtained after standard samples W6Mo5Cr4V2 quenching at1225°C, the original austenite grain is coarser, the size of grain reached about grade 5 and the hardness of sample is HRC67.
However we get a large number of carbide after tempering at 650°C for 2h.
The grain boundaries disappear, the number of carbon is much fewer and the coarse gets bigger.
The size of original austenite grain is large when quenching at 1225°C, distribution of carbides is not enough.
The martensite, undissolved carbide and retained austenite were obtained after standard samples W6Mo5Cr4V2 quenching at1225°C, the original austenite grain is coarser, the size of grain reached about grade 5 and the hardness of sample is HRC67.
However we get a large number of carbide after tempering at 650°C for 2h.
The grain boundaries disappear, the number of carbon is much fewer and the coarse gets bigger.
The size of original austenite grain is large when quenching at 1225°C, distribution of carbides is not enough.
Online since: October 2014
Authors: Elena Manuela Stanciu, Adrian Catalin Pavalache, Gabriel Marius Dumitru, Raúl López, Dan Petre, Mihai Vasile
Laser cladding competes in the world of rapid manufacturing with a large number of other techniques that are in vogue, but only some of them have been used for the production of.
In the sintered material, the WC grains tend to touch one another and form a continuous "skeleton" of carbide, with the cobalt binder occupying the spaces between the carbide grains [2].
Materials One of the best methods by which the mechanical properties of the deposited layer can be improved is reducing the grain size of the grain size of the material.
The variation of the experimental parameters was realized in complaisance with an L9 Taguchi array, this method of parameter variation was chosen due to the small number of experiments but with a high sensitivity to laser power density values.
Xian, A research on the grain growth of WC–Co cemented carbide, International Journal of Refractory Metals & Hard Materials 25, p. 121–124, 2007
In the sintered material, the WC grains tend to touch one another and form a continuous "skeleton" of carbide, with the cobalt binder occupying the spaces between the carbide grains [2].
Materials One of the best methods by which the mechanical properties of the deposited layer can be improved is reducing the grain size of the grain size of the material.
The variation of the experimental parameters was realized in complaisance with an L9 Taguchi array, this method of parameter variation was chosen due to the small number of experiments but with a high sensitivity to laser power density values.
Xian, A research on the grain growth of WC–Co cemented carbide, International Journal of Refractory Metals & Hard Materials 25, p. 121–124, 2007
Online since: March 2016
Authors: Liu Yi Guan, Bo Long Li, Li Jun Wei, Zuo-Ren Nie, Peng Qi
As shown in the Fig. 2.1, the eutectic Si particles dendritically distributed in the grain boundary and colored in gray.
The bright white substance was remained second phase in the grain boundary.
There are large numbers of precipitates with coarse morphology, but numerous second-phases in the grain boundary were resolved into the matrix after the solution and aging treatment.
In the cast condition,the white bulk phases were complex compounds rich in Mg, Si and with impurity elements Fe, which distributed in the grain boundary.
The mechanical property of Al-Si alloy depended on the grain size of α-Al matrix, the degree of solid solution supersaturating, and the quantity, the size morphology and distribution of the second phase that precipitated in the grain boundary.
The bright white substance was remained second phase in the grain boundary.
There are large numbers of precipitates with coarse morphology, but numerous second-phases in the grain boundary were resolved into the matrix after the solution and aging treatment.
In the cast condition,the white bulk phases were complex compounds rich in Mg, Si and with impurity elements Fe, which distributed in the grain boundary.
The mechanical property of Al-Si alloy depended on the grain size of α-Al matrix, the degree of solid solution supersaturating, and the quantity, the size morphology and distribution of the second phase that precipitated in the grain boundary.
Online since: October 2012
Authors: Hideyuki Yasuda, Kentaro Uesugi, Christopher M. Gourlay, T. Nagira
A number of groups have begun to investigate semi-solid deformation using synchrotron X-rays by both thin-sample radiography [5]-[7] and tomography of bulk samples [8]-[9].
Samples were produced by casting Al-15wt%Cu grain refined with Al-5Ti-1B into a steel mould, generating an equiaxed dendritic microstructure with mean grain size of ~100µm.
During this time, the fine-scaled as-cast microstructure developed into a globular microstructure with a mean grain size of 96mm, and the semi-solid heat treated sample had mean globule size of: 320 µm.
In this paper, we instead continue with a volume averaging approach of the sample with a higher number density of globules.
However, the fundamental behaviour of translation and rotation of discrete grains in response to forces acting at grain-grain contacts and the resulting shear-induced dilation are known to occur in both 2D and 3D granular deformation (e.g. [12]).
Samples were produced by casting Al-15wt%Cu grain refined with Al-5Ti-1B into a steel mould, generating an equiaxed dendritic microstructure with mean grain size of ~100µm.
During this time, the fine-scaled as-cast microstructure developed into a globular microstructure with a mean grain size of 96mm, and the semi-solid heat treated sample had mean globule size of: 320 µm.
In this paper, we instead continue with a volume averaging approach of the sample with a higher number density of globules.
However, the fundamental behaviour of translation and rotation of discrete grains in response to forces acting at grain-grain contacts and the resulting shear-induced dilation are known to occur in both 2D and 3D granular deformation (e.g. [12]).
Online since: June 2011
Authors: Roland von Bargen, Axel von Hehl, Hans Werner Zoch
The most relevant difference is a significant higher impact of the local microstructure on the material and processing behaviour due to the very low ratio between for example grain size and material thickness.
In this context it is necessary to generate a homogeneous micro structure as far as possible regarding grain size and alloying element distribution.
Particularly very thin components with wall thicknesses below 100 µm are very sensitive against inhomogeneities, because the number of grains in the cross section is usually very low.
A higher portion of coarse grain leads to a lower number of activatable gliding planes at external load.
Hence, an inhomogeneous and coarse grain size as well as other imperfections like defects or inclusions have a much greater impact on the failure behaviour of micro components the thinner the wall thickness is [1, 2].
In this context it is necessary to generate a homogeneous micro structure as far as possible regarding grain size and alloying element distribution.
Particularly very thin components with wall thicknesses below 100 µm are very sensitive against inhomogeneities, because the number of grains in the cross section is usually very low.
A higher portion of coarse grain leads to a lower number of activatable gliding planes at external load.
Hence, an inhomogeneous and coarse grain size as well as other imperfections like defects or inclusions have a much greater impact on the failure behaviour of micro components the thinner the wall thickness is [1, 2].
Online since: December 2013
Authors: Li Xu, Xian Wu Xiu, Cheng Qiang Zhang
It can be reasoned that the number of the sputtered molecules increases with the increase of the RF power due to the enhancement of bombardment by argon ions [8].
When the RF power is very low (15W), big laminar grains are found.
However, when the RF power getting higher, the big laminar grains disappear and only small grains can be found.
It means a large number of small grains can grow simultaneously and finally result in small grain structure.
When the RF power is very low (15W), big laminar grains are found.
However, when the RF power getting higher, the big laminar grains disappear and only small grains can be found.
It means a large number of small grains can grow simultaneously and finally result in small grain structure.
Online since: July 2015
Authors: Prapas Muangjunburee, Supachai Sukawet
Base metal indicated a much smaller grain size compared to the weld metal.
The weld metal in Fig.(10c) revealed coarse grain with an average grain size of about 50 - 60 µm.
Grains started to form from liquid and led to increasing area of solid and small amounts of liquid surrounding large islands of solid, then create grain boundary networks known as a dendrite [3,5,6].
Tensile strength decreased with increasing numbers of repair welding.
The porosities tend to increase with a number of welding. 3.
The weld metal in Fig.(10c) revealed coarse grain with an average grain size of about 50 - 60 µm.
Grains started to form from liquid and led to increasing area of solid and small amounts of liquid surrounding large islands of solid, then create grain boundary networks known as a dendrite [3,5,6].
Tensile strength decreased with increasing numbers of repair welding.
The porosities tend to increase with a number of welding. 3.
Online since: March 2017
Authors: Zainal Arifin Ahmad, Maliha Siddiqui, Julie Juliewatty Mohamed
The tetragonal structure peaks is identified as the shifted Pb(Zr0.52Ti0.48O)3 (reference number: 00-033-0784).
While, the secondary peaks are corresponded to PbO (reference number: 00-005-0561).
The average grain size is found to be 1.6 μm.
As reported by the Bahanurddin.et.al (2015), the average grain size of pure PZT at 1100 °C is 3.95 μm [10].
The FESEM micrograph shows the average grain size of the PZLT ceramic is in the range of 1.6 μm.
While, the secondary peaks are corresponded to PbO (reference number: 00-005-0561).
The average grain size is found to be 1.6 μm.
As reported by the Bahanurddin.et.al (2015), the average grain size of pure PZT at 1100 °C is 3.95 μm [10].
The FESEM micrograph shows the average grain size of the PZLT ceramic is in the range of 1.6 μm.