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Most of sulfides within grains were Cr2MnS4, while sulfides at grain boundaries were mainly FeS.
The number of spherical sulfides is then increased.
Fig.2 The morphology of sulfides in grain.
As the cooling rate was increased, more sulfides were found in grain rather than at grain boundaries.
The number of spherical sulfides is increased and the sulfides show a catenular distribution at grain boundaries. 3) The sulfides are easily fracturing and the microcrack are formed in the sulfides when the steel is stressed by force.

However, compared with a pure Cu film, salient grain growth of present dilute alloys does not takes place even at temperatures above 300 ºC , where the grain size is nearly the same as that of as-deposited films.
A large stress relaxation started to occur above 250ºC, associating with a large number of hillock formation.
Therefore, a large number of solute atoms most likely still remain in the Cu matrix, resulting in only a small decrease of resistivity at elevated temperatures.
It is clearly seen that on annealing at 400℃, the pure Cu film shows a large grain growth associating with a large number of void formation (dark spots in the photo), Fig. 4.
However, compared with a pure Cu film, grain growth of present dilute alloys does not significantly take place, showing nearly the same grain size as that of as-deposited films even above 300 ºC.

A large number of elongated grains appeared.
At the same time, the presence of a large number of shear bands along several systems was observed inside the grains (Figure 3c).
The grains contain a large number of micropores less than 1 μm in size (Figure 6 c, d).
It can be assumed that the growth is hindered by a large number of non-metallic inclusions and micropores.
The material also contains a large number of pores ranging in size from 50 μm to 1-1.5 mm.

Crop yield is affected by many environmental factors, ultimately depended on three elements, including ear number per unit area, grains per ear and 1000-grain weight.
And 1000-grain weight was decreased by 17.95 % and 15.08%.The number of grains per ear was the guarantee for high yield of corn.
Although ear number on middle sowing date was higher than that on early and late sowing date, which could’t make an impact on the effect of the interaction of ear number and 1000-grain weight.
The number of grains per ear and 1000-grain weight decreased systematically with the density increased.
So timely sowing increased ear number and 1000-grain weight, which was the primary cause if the remarkable increase of corn yield.

The paper studies the microstructure of two-phase ultrafine-grained titanium VT8M-1 alloy (Ti-5.7Al-3.8Mo-1.2Zr-1.3Sn), which was obtained by rotary swaging (RS).
The average size of grains/subgrains of the secondary α and β- phases was 0.3 µm [6].
Obviously, the reason is linked with silicides, which fix the grain boundaries and hinder the motion of dislocations during the creep tests.
Acknowledgements The reported study was funded by RFBR, project number 20-38-70105\20.
Semenova, Thermal Stability of Titanium Alloy VT8M-1 with Ultrafine-Grained Structure, Matec Web of Conferences, The 14th World Conf. on Titanium (Nantes)

The average grain size was less than 500nm if the sintering temperature was below 1700℃.
The aspect ratio of some grains reached 1.5.
A number of researchers have demonstrated superplasticity in several silicon nitride ceramics by applying the transient liquid phase, using ultrafineβ-phase powders, or by adding secondary phases into Si3N4 to refine the microstructure.
The grain size was observed by SEM experiment.
Although the average grain size was 150nm at 1500℃, the density was only 90.3%.

During thermal cycling of titanium with an initial superheated structure, thermal stresses after a certain number of cycles can lead to intragranular plastic deformation, and subsequent recrystallization annealing lead to grain refinement [17, 18].
The number of TCT cycles varied from 1 to 50.
Grain refinement occurs after the first cycle of the TCT (dnom. = 700 microns).
With an increase in the number of cycles, a grain decrease corresponds to an increase in the fatigue limit, which reaches a maximum value (σ-1 = 220-230 MPa) after 10-15 cycles of TCT (dnom. = 245-219 microns).
In our case, the fatigue limit reaches this level with a decrease in the grain size by ~ 3.3 times, which is possibly determined not only by the grain size itself, but also by the method of its production and, in particular, the formation of subgrains with grain-boundary angle in several degrees at the optimal number of TCT cycles, which serve as an additional obstacle to the spread of plastic deformation [24].

Journal Title and Volume Number (to be inserted by the publisher) 2 Fig. 2.
AMSDAMSDAMSDAMSD Journal Title and Volume Number (to be inserted by the publisher) 4 (a) (b) Fig. 5.
Schematic drawings of grains (hexagons) (a) before and (b) after grain growth under stress.
The grain growth rates are determined by the migration velocity of grain boundaries.
The evolution of the {111}<110> and {111}<112> orientations can be explained by Journal Title and Volume Number (to be inserted by the publisher) 6 the SERM model, in which grains whose MYMDs are parallel to AMSD in the trenches grow in preference to others.

It is clear that a number of large recrystallized grains have formed but that there is a gradation in grain size: this being finer nearer the compression surface.
On the side of the recrystallized band towards the neutral axis, grains reached more than 200 µm in size, indicating fewer grains but more growth.
Most grain boundary misorientations lay below 10° although an increasing number lay in the range 10° to 20°.
Accompanying this, a large number of high angle grain boundaries (30°- 45°) were found, suggesting that a few fine-scale recrystallized grains may have been nucleated.
And grain boundary misorientation in recrystallized areas of compressed regions increased with increase in the recrystallized grain size.

The response variables were as discussed, flow stress maximum and grain size.
The average grain size was determined based on the standard GB/T 6394-2002 and the grain grade was between 6 and 9.
Compared with the error, the strain rate almost had no influence on the grain size.
As shown in Fig. 4, the grains were almost new grains generated by DRX.
Comparing with the error, the strain rate almost had no influence on grain size.