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Online since: September 2008
Authors: Maylise Nastar, Daniel Monceau, Clara Desgranges, Nathalie Bertrand, Dominique Poquillon, Gouenou Girardin
Indeed,
oxidation experiments on Ni-base alloys have demonstrated the occurrence of two different types of
base metal damage: penetration of oxygen in the grain boundaries and the formation of a Crdepleted
metal layer immediately below the Cr2O3 oxide inner sub-layer as a consequence of the
selective oxidation of Cr [1].
Several hypotheses have been proposed to explain this accelerated diffusion, such as the presence of a perturbed layer near the alloy surface that contains small grains and large density of defects [3] or a massive injection of vacancies into the metal caused by the growth of the oxide layer [13-15].
The model EKINOX does not make the classical steady-state hypothesis, and is thus able to study transient stages, evolutions in a finite size substrate due to oxidation and effects of microstructural changes, such as grain growth or dislocation density evolution.
All calculations have been done with an initial number of slabs Ns =132 having a typical initial thickness of 0.25 µm.
This can be done following previous work on a model developed to simulate the irradiation assisted segregation at grain boundaries of austenitic steels [25-26].
Several hypotheses have been proposed to explain this accelerated diffusion, such as the presence of a perturbed layer near the alloy surface that contains small grains and large density of defects [3] or a massive injection of vacancies into the metal caused by the growth of the oxide layer [13-15].
The model EKINOX does not make the classical steady-state hypothesis, and is thus able to study transient stages, evolutions in a finite size substrate due to oxidation and effects of microstructural changes, such as grain growth or dislocation density evolution.
All calculations have been done with an initial number of slabs Ns =132 having a typical initial thickness of 0.25 µm.
This can be done following previous work on a model developed to simulate the irradiation assisted segregation at grain boundaries of austenitic steels [25-26].
Online since: September 2011
Authors: Hai Jun Wang, Xu Hua Ren, Ji Xun Zhang
The in situ stress measurement methods based on the DME are commercial and permit large number of measurements.
Compared to the traditional in situ stress measurement, the methods based on the memory effect are commercial and permit large numbers of measurements.
One was the coarse-grained sandstone, which has already been developed and verified available[16].
Therefore, the crack cumulative number was recorded in the second loading as an additional identification method.
Cumulitive cracks number vs. stress in the second loading.
Compared to the traditional in situ stress measurement, the methods based on the memory effect are commercial and permit large numbers of measurements.
One was the coarse-grained sandstone, which has already been developed and verified available[16].
Therefore, the crack cumulative number was recorded in the second loading as an additional identification method.
Cumulitive cracks number vs. stress in the second loading.
Online since: July 2011
Authors: Gang Tao Jia, Tian Zhu Huang
With agricultural connotation and denotation having made apparent change, the function of agriculture for producing grain and other commodities is no longer the only function.
With the number of agricultural leisure Sightseeing Park across regions rapidly increasing, the scale continuing to expand, the demand for agriculture leisure sightseeing function presents increasingly vigorous trend.
With the number of agricultural leisure Sightseeing Park across regions rapidly increasing, the scale continuing to expand, the demand for agriculture leisure sightseeing function presents increasingly vigorous trend.
Online since: May 2012
Authors: Yi Qiang Sun, Lixin Wu, Zhifen Wang, Jianhua Li, Youdeng Zhang
The Phosphorus would enrichment on the grain boundary of the austenite, reduce steel plastic, and easy to generate crack in the drawing process.
Under the double affect of the net-carbide and the phosphorus segregation, a large number of pores and cracks appear in the center of the wire during the drawing process.
Under the double affect of the net-carbide and the phosphorus segregation, a large number of pores and cracks appear in the center of the wire during the drawing process.
Online since: October 2012
Authors: Yan Tang Chen, Kai Guang Zhang, Ji Hao Cheng
A great number of polygonal ferrite was recognized.
The proeutectoid ferrite was recognized at the pre-austenite grain boundaries.
The proeutectoid ferrite was recognized at the pre-austenite grain boundaries.
Online since: June 2014
Authors: Norbert Jendzelovsky, Lubomír Baláž
The final report of the geotechnical survey declared that the subsoil consisted of fine-grained soil class F6, with the deformation modulus of 10 MPa.
Registration number is 01/0629/12.
Registration number is 01/0629/12.
Online since: July 2015
Authors: Ekaterina Novak
Theory
It is well-known that continuous distribution of magnetic core ferroparticles on their diameters d is successfully described by lognormal function or Γ distribution and the parameters are determined from the grain size analysis or electro-optical measurements [9].
Additionally, pair correlation functions are the sum over the concentrations of both fractions and over all three types of dipolar coupling constants λ: (4) Indexes pq take the numbers ss, sl, ll.
Additionally, pair correlation functions are the sum over the concentrations of both fractions and over all three types of dipolar coupling constants λ: (4) Indexes pq take the numbers ss, sl, ll.
Online since: June 2013
Authors: Xi Hong Li, Yi Bin Zhang, Hai Dong Liu
Therefore, numbers of waxy maizes are processed into grain canned or frozen for sale.
Online since: November 2007
Authors: Katsumi Tanaka
Introduction
A number of both experimental and theoretical studies on explosive welding have been
reported[1-12].
The wave length calculated by SPH is 100 µm approximately which is relatively larger than experimental observation in which the interface of metal clad show complicated micro structures between grain boundaries with fusion process.
The wave length calculated by SPH is 100 µm approximately which is relatively larger than experimental observation in which the interface of metal clad show complicated micro structures between grain boundaries with fusion process.
Online since: July 2015
Authors: Alexander V. Rogachev, Dmitry L. Kovalenko, V. Gaishun, M. Dobromir, D. Luca, A.S. Chirtsov, Dmitry L. Gorbachev, Vasili V. Vaskevich
Such configurations cannot be used by other methods, or are associated with a large number of difficulties.
The coating synthesized from the standard target is characterized by a mild-grained structure of equally-sized granules of similar shape, with an average granule size of about 40±5 nm, in the presence of significantly larger fragments ranging in size from 200 to 350 nm.
The coating synthesized from the standard target is characterized by a mild-grained structure of equally-sized granules of similar shape, with an average granule size of about 40±5 nm, in the presence of significantly larger fragments ranging in size from 200 to 350 nm.