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Heat treatment is an important method for improving the mechanical properties of industrial parts that are made through the powder metallurgy.
After heat treatment, these steel's mechanical properties are affected by the heat treatment parameters and the initial density.
Their mechanical properties are then evaluated and recorded.
Both of these parameters affect the final properties, especially the mechanical.
The figures also show that mechanical properties were improved with increasing density.

Resin mineral composite (RMC) reinforced by fibers belongs to a multiphase material, whose mechanical strength depends on its material properties of components and microstructure characteristics of fibers including surface state, shape, and so on.
As the most fundamental factor to affect mechanical performance, bonding property is also one of the main elements to influence the reinforced effect of fiber on RMC.
Therefore, bonding property of fiber-matrix interface is the key factor to influence macroscopical performance of composite.
By interface shear transfer, fiber and matrix both sustain forces to achieve fiber-reinforced effect [4], thereby improving the mechanical properties of RMC.
Surface activity of reinforcing fiber largely depends on many factors including surface energy, type and quantity of reactive functional groups, microcrystalline structure, etc.

The results of the study reveal the contribution of CO3 stabilizer in maintaining the stability of the physical and mechanical properties of BNKS-18: rubber containing CO3 has less property changes in the open air.
Studies of deformed specimens (by 30%) under the influence of climatic factors were also conducted.
Natural ageing of rubber is affected by changing climatic conditions: natural light, atmosphere precipitation and, partly, of ozone, temperature fluctuations and other factors.
Rubber samples modified with CO-3 demonstrated the best results on the stability of physical-mechanical properties in climatic tests.
Figure 2 presents the results of the study of samples deformed under the influence of climatic factors (30%).

The advantages of using a glass-ceramic include shape stability during the sintering stage, improved dielectric properties, mechanical strength, and controlled thermal expansivity.
The advantages offered by this approach include shape stability after the sintering, improved dielectric properties, mechanical strength, and controlled thermal expansivity [7,8].
The microwave dielectric properties of glass-ceramic were measured by a network analyzer (8720Es, Agilent, USA) at 6-8 GHz.
The highest value on relative, apparent densities and shrinkage at 850-900℃ can critically affect other properties such as dielectric properties.
At 750℃, the quality factor was lower than the others because the remaining amorphous phase affected the quality factor.

Among them, the affecting factors of mechanical properties of the particle/polymer composites are mainly the particle size, filling amount, surface characteristics and dispersion in the polymer.
Impact Properties.
Conclusion (1) The addition of Sb2O3 particles can improve the tensile properties, impact properties and crystallization properties of PP
Li, Mechanical and thermal properties of nano-SiO2/PA66 composites, Acta.
Wang, Investigation on the mechanical properties of nano-TiO2/PP composites, Acta.

Furthermore, the properties of the joints were also tested.
The results indicate that with the increase of the pressure - from 2 MPa to 6 MPa - the microstructures and mechanical properties were improved, and more similar to those base alloys.
However, research has shown that the brittle intermetallic constituents, which have been demonstrated to be detrimental to the mechanical properties of joints, are often formed across the joint region in the TLP bonding process [8,9].
Results The tensile strength of joints The mechanical properties of the T91/12Cr2MoWVTiB TLP joints under different pressures are as shown in Table 1.
It is often noted that weld width is one of the important factors which can affect the joints properties.

The results show that: The function of fly ash to the MPC is as followed: physical fill, superplastic and chemical reactions; the optimal content of fly ash is about 30% by weight, and MPC with 30% fly ash has excellent mechanical property and high fluidity; the fineness of magnesia affected the mechanical properties of MPC.
In China, Jiang et al [5] discussed the affecting factors of MPC’s properties based on rhe setting time, strength, interfacial bond properties with old concrete and hydration kinetics theory.
The durability and the properties of MPC based-materials as repair material were studied systematically by Yang [6,7] and Wang et al [8,9], meanwhile, they also studid the factors influencing on setting time and the mechanical property of MPC, and the experiments in real-world documents are very promising.
But at the same time, as a chemical bonded cement material, the high cost problem of the raw materials of MPC is the most important limiting factors affecting the applications.
Microstructure and mechanical properties of mortars made from magnesia-phosphate cement[J].

Various factors can be summarized as three types [1]:  Geological factors, rock physical and mechanical property, rock mechanical property, crustal stress, surrounding rock stress, geological structure and so on. ‚ Engineering factors, tunnel sectional shapes and scale, its length and depth-span ratio and so on.ƒ Execution factors, tunnel execution schedule, engineer methods and supporting measures and so on.
Rock property and structure are primary factors of its stability.
Plastic surrounding rock includes various argillaceous rock, broken and friable rock and water-sucking expansive rock which have harmful properties such as fast weathering speed, low mechanical strength and softening, disintegration and expand when wet.
Mineral component, granules in content, water content, soluble salt and organic material content in weak interlayer is stated generally as the main factors which determined its property.
Besides, the fragment property and cement condition of fault materials affect rock stability.

Effect of Heat Input on Impact Toughness of Coarse-grained Heat-affected Zone of a Nb-Ti Microalloyed Pipeline Steel Zhou Gaoa, Ran Wei and Kaiming Wub International Research Institute for Steel Technology, Wuhan University of Science and Technology, Wuhan 430081, China agaozhou.wust@163.com, bwukaiming2000@yahoo.com Keywords: coarse-grained heat-affected zone, large heat input welding, impact toughness, martensite/austenite constituent Abstract.
The previous works on the welding parameters revealed that the microstructure in the weld and CGHAZ plays an important role in defining the mechanical properties of welding joints [2].
Besides the microstructure, the microalloying also has much influence on the mechanical properties of base metal, weld metal and heat-affected zone.
There are many factors influencing the formation of acicular ferrite.
It is usually considered that the chemical composition, inclusions and austenite grains size are the main factors.

Pore Structure and Mechanical Properties of ZrC/SiC Multi-Components Modified C/C Composites Xiuqian Li, Haipeng Qiu and Jian Jiao AVIC Composite Co., Ltd., Beijing 101300, China Key words: ZrC/SiC multi-components modified C/C, pore structure, microstructure, mechanical properties.
Effect of sample’s porosity on the mechanical properties.
The pressure of these deficiencies plays an important role in the mechanical properties.Table 3 shows the flexural properties of samples with different porosity .
Besides, the matrix composition is another important factor affecting the mechanical properties of samples.
The higher content of SiC can enhance the mechanical properties under the condition of similar porosity.