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Also, only limited systematic investigations have been focused on HAZ properties.
Figure 1 shows the HAZ properties both with and without PWHT.
Fig. 1 Influence of PWHT on properties of HAZ Effect of PWHT on microstructure.
However, taking into account the applied environment of ASTM4130 steel, PWHT is the only measure to improve HAZ properties.
The reason may lie in two factors.

The paper outlines initial results of investigations, carried out with use of the active thermography, how the temperature affects onto thermophysical properties demonstrated by superalloys used for construction of gas turbines.
These investigations enabled to find out variations of thermophysical properties of these superalloys as a function of temperature.
Operation of gas turbines is always associated with occurrence of failures that may happen to their components [1], in particular to the blades that are the most exposed to various detrimental factors.
The material grains expand by more than 50% (Fig. 3) that adversely affects mechanical properties of the alloy.
The detected growth, merging (coagulation) and corrugation of particles within the γ’ phase substantially affects deterioration of heat resistance properties demonstrated by the alloy.

The mechanical properties were interpreted on the base of real fibre content, fibre orientation, fibre length and diameter distributions and morphology of the composites.
The fibre/matrix adhesion plays an important role on mechanical properties because of the transmission of composite loads to the fibres, as well as in its ageing behaviour.
For the young’s modulus prediction, the Cox-Krenchel’s model including both the measured fibre orientation and fibre ratio factors gives an improvement of the calculated values with regard to the experimental data, but a better definition of fibre properties linked with fibre shape ratio associated to an adjustment of matrix properties permitted to improve significantly the modulus evaluation by the Halpin-Tsai model.
Van den Oever, Mechanical properties of short-flax fibre reinforced compounds, Composites, Part A 37, 1591-1604 (2006)
Baley, Importance of fibre preparation to optimize the surface and mechanical properties of unitary flax fiber, Industrial Crops and Products, 32, 662-667, (2010)

Furthermore, the size of the tools and friction coefficient are some of the major factors that influence the clinching joint [3].
In our basic model, the materials used are as follows: Steel 201 sheets & Aluminum 5052-H34 both with same thickness of 1.2 mm (punch and die side) – the mechanical properties are shown in Table 1.
Table 1: Mechanical properties for Steel 201 and Al 5052 Material: Steel 201 Al 5052-H34 Mass Density ton/mm3 7.7503 e-9 2.689e-9 Young’s Modulus 1.972 e5 MPa 7.0327e4 Poisson’s Ratio 0.29 0.33 Yield Stress 309.79 MPa 203.27 The true stress-strain curve for these materials can be approximated by using the power law: material was modeled to be isotropic.
The clinching process parameters need to be optimized to get more thickness in the bottom of the joints without affecting the other parameters, and this is achieved not only by optimization but also by obtaining an accurate experimental data for the material behavior and properties in order to reach the maximum strength and the highest quality of the joint.
There is some discrepancy between the two curves due to the mesh size difference and the material properties and behavior.

However, its mechanical and hot-working properties are not satisfied.
The film-like Bi dissevers the matrix and lead to the decrease of mechanical properties.
Test Methods of Mechanical Property and Machianbility.
The mechanical properties entirely meet to the application requirements.
In order to examine the factors affecting the mechanical properties of BiAl-brass, fracture surface of the extruding bar of BiAl-1# was analyzed with SEM with EDS, as Figure 4 shown.

The current situation of preparation and mechanical properties of typical rivet joints on C/SiC composites is summarized.
This results in the randomness on mechanical properties of the connecting unit.
The failure of (a) and (b) belong to the global damage mode, but the latter should take the bonding force between rivet and connecting plate, the material properties and the factors of instability failure mode into consideration.
The mechanical influencing factors and characteristics are analyzed preliminarily.
The key characteristics of different defects, stress concentration and other factors affecting the connection are obtained by calculation and simulation, and can be verified by the actual test.

Laser-arc hybrid welding properties of aluminum alloy 6005A JIN Xing Ye1, a SONG guang hao2,b ZHENG Wei gang3,c 1School of Energyand Power Engineering，Wuhan University of Technology, Wuhan 430063, China 2School of Energyand Power Engineering，Wuhan University of Technology, Wuhan 430063, China 3Engineering Training Center, Wuhan University of Technology, Wuhan 430063, China a593392509@qq.com, b1053087993@qq.com, czfeidiao@126.com Keywords: Aluminum alloy 6005A; Laser-arc hybrid welding; joint microstructure; joint mechanical properties.
Optional 6005A-T5 aluminum alloy sheet be 11 kinds of process parameters laser - arc hybrid welding, by comparison, select standardized test results carried out to optimize weld joints microstructure, mechanical properties of weld performance analysis.
Introduction:6005A aluminum 6005A aluminum alloy medium strength is Al-Mg-Si heat treatment, the alloy has excellent processing property and good corrosion resistance.
(a)The parent material (b)The fusion zone (c)Weld line Fig.2 The optical microstructure of laser - aluminum alloy 6005A arc hybrid welding Mechanical properties of joints 4.1 Tensile strength Static tensile strength test to obtain the process number 11 welding parameters of welded joint specimen sampling.
The heat affected zone also appeared a certain degree of softening, but the heat affected zone is very narrow, it is one of the arc hybrid welding characteristics and advantages of laser.

The corrosion behavior was also affected by the ECAP factors especially the press pass number and the pressing temperature.
Finally some prospects of making UFG materials combined with high mechanical property and good corrosion resistance by ECAP technology were expounded.
Most investigations of UFG material fabricated by ECAP have been focused on the structural characterization, thermal stability, microhardness and mechanical properties.
Thorpe et al. have revealed [5] hat UFG materials may appear enhanced corrosion properties.
On the other hand, study the effect of the whole ECAP factors to the corrosion behavior synthetically, then optimize these ECAP parameters and use some post heat treatments like annealing or ageing to gain UFG materials combined with high mechanical property and good corrosion resistance will be the developing direction of the ECAP technology.

Effect of Heat Treatment Conditions on Microstructures and Mechanical Properties of Cu-9Ni-6Sn-0.22Nb Alloy Si.
Among these affecting factors, the precipitates play an important role, and more precipitates improve electrical conductivity.
Jie, Effect of V addition on microstructures and mechanical properties of Cu-15Ni-8Sn alloy, Mater.
Li, Effect of direct current pulses on mechanical and electrical properties of aged Cu-Cr-Zr alloys, Mater.
Xing, Effect of thermo-mechanical treatment on microstructure and properties of Cu-15Ni-8Sn alloy Rare Metal Mater.

Analysis of influence factors on filling body stability Theory and pratical research shows there are many factors affecting the stability of filling body, which can be attributed to the geological factors, mining factors and strip filling body mechanics.
The mechanical properties of filling body.Mainly refers to the elastic modulus of cementing filling body, cohension and internal friction angle, etc.
These are main factors affecting the strength of filling body, and have great influence on strength and stability of filling body.
Under the certain condition of roof and floor, if the mining depth and mining height have been determined, the filling rate and mechanical parameters of filling body are the main factors affecting the plastic zone breadth of filling body.
The filling rate and mechanical parameters of filling body are major factors that affect plastic zone breadth of filling body.