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As you can see from Fig.3(a), the crack arise from the boundary of austenitic grain, which explains the erosion process of 304 stainless steel by melen metal.
The erosion has been strongly hampered by austenite grain group.
Contrasting Fig. 3(a) and (b),it can be found that there are low content of Fe and high concentration of Cr on the grain boundary,and Cr elements in grain boundary formed segregation, which can effectively slow down the erosion of molten alloy.
Fig. 4 Point analysis of the regional energy spectrums of 304 stainless steel The presence of the corrosion layer mainly due to the diffusion of Mg alloy melt atoms from surface to inside and infiltration of corrosion sample macro voids or grain boundary, then caused corrosion, namely, diffusion layer of Mg and Fe is the erosion layer of corrosion sample.
Because alloy elements Cr of stainless steel will be gathered in the grain boundary and hinder the diffusion of Mg atoms into the substrate, so that the growth of erosion layer becomes slow.

Clients locally cache the finer-grained locks for ranges of files they hold.
It implements the control of file's coarse-grained access.
However, when the number of clients and files increase, the NFS server becomes a bottleneck, efficiency is restrained.
To maintain the fine grained parallel data access, we introduce the range lock, based on the semi-preemptible lock.
The performance in concurrency is indicated by the number of blocked requests.

Experimental methods based random number generator system known as the Monte Carlo method [4-6].
At present, the application of parallel genetic algorithm to solve the structural optimization problem is also less, and most fine-grained parallel algorithms, the efficiency of coarse-grained parallel algorithm.
According to a group of two-dimensional data, the number of points on the plane required to determine a function y = r (x) curve, as close as possible to make these points with the curve of the whole.
Have a large number of calculations in order to improve the performance, so we should further improve the calculation speed.
Softening of nanocrystalline metals at very small grain size.

Use of these procedures makes it possible to decrease the grain growth and to control the phase transitions.
Purpose, specimens and test conditions The purpose of this paper is to determine fatigue properties of the welded joints of the high strength fine-grained steel S1100QL and its fatigue fracture.
There were drawn the changes of stress amplitude Dsa (Fig. 3a) and the changes of plastic strain amplitude Deapl (Fig. 3b) versus number of cycles N.
Graphs of stress amplitude Dsa vs. number of cycles N (a) and plastic strain amplitude Deapl vs. number of cycles N (b); the curves were described by the level of the total strain amplitude Deac.
Hysteresis loops (a) and changes of stress amplitude Dsa in the function of number of load cycles (b) for the GSAW welded samples depending on the total stress level Deac.

Fortunately, the composite rolling with its advantage to reduce the deformation resistance and grain refining has gradually become a research hotspot in the field of magnesium [3].
Asymmetrical rolling was one of the continuous severe plastic deformation (SPD) techniques suitable for achieving severe grain reduction below the micrometer level, together with a deep industrial potential.
On the other hand, the number of rolled sheet layer is monolayer or double-deck.
Table 2 The experimental arrangement of rolling simulation analysis Test count Rolling parameters 1 2 3 4 5 6 Number of plies Monolayer Monolayer Double-deck Double-deck Double-deck Double-deck Upper roll/（m·s-1） 4 4.8 4 4.8 5.6 6.4 Lower roll/（m·s-1） 4 4 4 4 4 4 Asynchronous ratio 1:1 1.2:1 1:1 1.2:1 1.4:1 1.6:1 3 Simulation results and analysis Fig.2 shows the equivalent stress nephogram of AZ31 magnesium alloy sheet rolling simulation analysis in different experimental arrangement.
So asymmetrical accumulative rolling-bond can reduce the number of rolling, then improveing the production efficiency.

It is known that the mechanical properties of the ZrB2-SiC composites depended on the grain size of ZrB2 and SiC.
In particular, the grain size of SiC strongly affects the mechanical properties of the ZrB2-SiC composites.
Zhu et al. [10] showed that smaller starting SiC grain size led to improved densification, finer grain size and higher strength for the ZrB2-SiC composites.
When the sintering temperature increased from 1850°C to 1900°C, the ZrB2 and SiC grains grew to 2.3 µm and 0.8µm, respectively.
In addition, a number of porosities were observed in these samples.

Remote sensing images, like other natural images and figural images, all are composed of partial flat regions and partial grain regions as well as slight edge changing regions.
Figure 2 Energy Distribution Chart for Wavelet Coefficients Statistical analysis on these detailed subgraphs indicates: except for the extremely slight local regions with strong grain, most of the regions with relatively weak grain approximately subject to the generalized Gaussian distribution[1], especially the flat regions whose average grain value are mostly equal to 0.
Compare variance value and , classify that with variance less than into flat region; that larger than and less than into secondary flat region; that larger than and less than into secondary grain region; that larger than into grain region; (3) Remove the wavelet coefficient of flat region to zero; (4) Translate the bitplane of wavelet coefficient of the secondary flat region downward for bitplane, in which .
In a similar way, translate the bitplane of wavelet coefficient of secondary grain region downward for bitplane.
The number of high-frequency sub-brands of the image obtained after the decomposition is twice the original.

For this reason, a number of recent investigations have been carried out with the objective of quantifying explosion welding residual stresses [7-11] as well as to establish appropriate stress relaxation treatments [12-14].
The microstructure of the Inconel 625 base material is composed of equiaxed grains.
The ferrite and pearlite grains become elongated close to the interface and follow its wavy structure.
The grain formation denotes a complex plastic flow.
The grain structure is now equiaxed and no longer oriented parallel to the wavy interface.

The ball milling process refines the grain size of all solid elements into nano scale.
The success of this operation depends on a number of process variables and properties of the milling powder.
In Stage 3, the orientation of the grain becomes random.
The high angle grain boundaries replace the low angle grain boundaries by boundary rotation or sliding.
The milling process induces defects, deformation in a particle leads to synthesis of grain size particle.

It indicates that 10-mol% excess Bi content facilitates the grain growth and leads to a defect-free surface.
On the other hand, it can be seen that the grain size of BET thin films varies with excess Bi content.
The 2Pr values may be primarily controlled by the grain size for the BET thin films with 5, 10, 15, and 20-mol% excess Bi contents annealed at 700 °C.
The number of domain switching variants will increase with the increasing grain size, because the reducing of volume fraction of the grain boundaries and the domain wall will make the reorientation of the domains easier [2].
It indicates that the large grain size corresponds to the large 2Pr value, and the 2Pr value of BET thin films varies with the excess Bi contents.