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The microstructure test in this paper is mainly about the grain of the material and the information of the structure of the amorphous particles.
Acknowledgements This work was supported by the: National Natural Science Fund, project number 21663018; Natural Science Fund, project of Inner Mongolia (2014MS0211); and the Inner Mongolia Talent Development fund (2014).

Visual examination Visual examination of the failed helical gear showed that a number of adjacent teeth and random teeth failed by fatigue, as shown in Fig. 3 (a).
The failed gear outer surface region as shown in Fig. 5 (a) can be seen with a transgranular fracture and intergranular fracture crack propagation is along grain boundaries which these results indicate that the mode of fracture within this outer periphery of the gear was brittle.

The stainless steel is an alloy of Fe, Cr, and Ni mainly, and grain boundaries were very clearly observed.
Acknowledgement This work was partially supported by JAPS KAKENHI Grant Number 17K05021.

The percentage of the remaining DPPH against the standard concentration was plotted to obtain the number of antioxidants necessary to decrease by 50% the initial DPPH concentration (IC50).
Antioxidant activity and total phenolics in selected fruits, vegetables, and grain products, Journal of Agricultural and Food Chemistry, 46 (1998) 4113-4117

The reason is that with increasing in deformation, metal atomic kinetic energy increases, and amplitude of atomic thermal vibration also increases, making displacement activity and slip system increase, so as to improve deformation compatibility between crystal grains.
While with increasing in strain rate, deformation time of unit strain reduces, and the number and the speed of dislocation movement increase, which makes the chance of dislocation crisscross and the density of balancing dislocation increase, so as to raise critical shear stress.

Also in this figure, the numbers 1-4 indicate the areas of structure and reaction products composition study.
Jones: Grain boundaries: Their Character, Characterisation and Influence on Properties (IОM Communications Ltd., London 2001)

Coir pith has a lignocellulose nature and it composed of 2-3% short fibers (up to 2 cm) and cork (with particles from grain size to powder size).
IDS Number: 176EG [2] Roels, S., Carmeliet.

Mn vapor will condensate in the surface of Fe grain, then began diffuses through Fe particle surface [11].
However, the role of porosity in the corrosion process was higher than free carbon due to it has greater numbers in material.

Larger numbers of stalks used as building materials can not only handle stalks for increasing farmers' income, but also provide plenty of construction raw materials.
Table 2 Test results of river sand performance Apparent density [g/m3] Bulk density [kg/m3] Voidage P′[%] Grain composition Degree of thickness 2.56 1560 40 The second district, grading qualified Mx=2.4，medium sand Cement. 42.5# Portland cement, origin: Zhangjiakou.

Introduction A large number of solid waste materials generated in industrialised nations nowadays which not only directly in the home, but indirectly from factories as well.
It is believed that at this ratio, the microstructre of the concrete is stronger because the grains are binded closer which improve its density.