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It suggests that the crystal grain is fine.
One type is big annealing twins throughout the whole grains, and the other is small annealing twins starting from the grains boundary and ending in the grains.
Because of the different orientation between twins and the matrix, the annealing twins have the effect of grain refinement.
And there are a number of annealing twins, which formed during hot-rolling and solution-treatment.
The grain size of the steel at 900˚C, 1000˚C, 1100˚C and 1200˚C were 20μm, 45μm, 80μm and 130μm respectively.

But when the sheet is heated to about 400°C, grains become coarse, and can be easily oxidized.
Especially, when the temperature rises to 270 °C, the number of grains inhibits the recrystallization and growth of the renewable grains.
The grain size at temperature 210°C and 240°C is between 3-10 mµ .
When the temperature goes up to 270°C，the unevenness of the grains increased significantly, the size was up to 15 mµ .
The reason of good plastic deformation of AZ31 at the high temperature is the effective harmonization of the grain boundary.

Grain refinement is very important for Al-Si alloy in order to obtain fine equiaxed grain and to increase the elongation of materials.
Besides, the number of dimple increased significantly and the size is much small than that of A356 without RE addtion.
Gruzleski, Grain refinement mechanisms of hypoeutectic Al-Si alloys, Acta Mater. 44 (1996) 3749-3760
Gruzleski, Mechanism of grain refinement in aluminium, Acta Metall.
Ghomashchi, Grain refining of conventional and semi-solid A356 Al–Si alloy, J.

Powder proportions and specimen number Sample No.
And to a certain degree, ZrO2 can hinder the Al2O3 grain from growing up.
The main reason is that additives can promote sintering and hinder the Al2O3 grain from growing up.
The main reason is that the existence of ZrO2 particles will hinder the Al2O3 grains from growing up and they disperse among the Al2O3 grains to dispersion-strengthen the composite ceramic.
Secondly, to a certain degree, ZrO2 can hinder the Al2O3 grain growth and disperse among the Al2O3 grains to dispersion-strengthen the composite ceramic.

The processing method by a proposed gelatin based elastic stone is located in the middle of bonded abrasive processing and loose grain processing.
Additionally, green silicon carbide is used for abrasive grain.
In this case, GC#400 was used as the abrasive grain in the gelatin stone at 10wt% of concentration.
The abrasive grain of the used gelatin stone is GC#1000, and the concentration is 40wt%.
Conclusions In this study, an elastic whetstone which consists of gelatin and abrasive grain was proposed and produced experimentally.

The equiaxed grains of the Cu phase with an average size of 200 nm were developed after eight passes of ECAP.
After eight ECAP passes, the equiaxed grains appear with the size of about 200 nm and non-distinct boundaries, indicating the presence of high internal stresses created by high-energy non-equilibrium grain boundaries.
It is obvious to find that tensile strength increases almost linearly with the number of ECAP passes regardless of with aging treatment or not.
The equiaxed grains of the Cu phase with an average size of 200 nm was developed after eight ECAP passes
Horita, Using equal-channel angular pressing for refining grain size, JOM, 52 (2000) 30-33.

Active cutting edge density is the number of active cutting edges per unit area of the wheel surface.
This is in accordance with the number of active cutting points at contact calculated
This means that depends on the characteristic grain size and the concentration factor.
Furthermore, the specific energy increases as the number of cutting points and their sharpness decrease.
This can be attributed to an increased tendency for cutting action and chip formation rather than plowing and sliding as the abrasive grains interact with the workpiece.

We empirically demonstrate the effectiveness of the designed strategy by building a challenging fine-grained image annotation task on Amazon Mechanical Turk.
A first proposal of the solution would be to increase the number of workers until one answer outstands.
Throughout the paper, we use a challenging fine-grained image annotation task to demonstrate the effectiveness of the idea.
In addition, we use ＃P and ＃N to denote the number of positive votes and negative votes, respectively.
Conclusion In this paper, we study the problem of deciding proper number of workers for a crowdsourcing task.

Indeed, for a number of mechanical components, ferrite pearlite microstructures are no longer sufficient in terms of mechanical properties.
Materials and experimental procedure A number of bainitic steel grades were investigated, the compositions of which are indicated in Table 1.
A number of points may seem inconsistent with this proposal however.
Age hardening has been proposed to explain the observations, and a number of inconsistencies have been underlined.
Wang et al., Refinement of sub-grain and enhancement of impact energy absorption for ultra-high strength bainitic steels, Mater.

Different soaking time,10 and 30 min were employed to achieve different grain sizes.
For the same soaking time, the κ-carbides distribute within the austenite matrix and along the ferrite grain boundaries grow larger with the increase of annealing temperature. κ-carbides can hardly be found in the specimen annealed at 900 oC while a number of fine ferrite form inside austenite band.
It presents a bimodal duplex microstructure made of fine α-ferrite grains and austenite band.
The grain boundary of the fine ferrite distributes among the austenite band is smoother with the increase of soaking time as the result of the movement of grain boundary.
Generally, α grains and γ grains grow up quickly when the annealing temperature is over 900 °C