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The proper core hole diameter according to material flow possibility enables forming of complete thread profiles, which can consequently enhance the mechanical properties of the thread.
Manufacturing the internal thread using thread forming instead of conventional thread cutting can enhance the martial properties by inducing the work-hardening in thread profiles (VDI 3334), which can affect the static and dynamic properties of the formed threads [2, 3].
In order to clarify the mechanical properties of the formed threads, tensile and load increase fatigue tests were done by engaging the formed thread for four initial turns with M6 steel 12.9 rods.
Conclusions This study investigated the influence of core hole diameter on mechanical properties of the formed thread.
Gericke, Factors influencing the decision of conventional/hybrid lightweight design strategies and their effect on the design process, Proc.

The results also showed how the negative part of the load affected the propagation rate of the crack, mainly for larger cracks and smaller loads.
It is assumed by many researchers that FCG rate is not affected by the compressive part of the cycle [1,2].
The mechanical properties of the material with 100 HV hardness are: Yield Stress 272 MPa, Tensile Strength 289 MPa, Elongation to Fracture 18% and Young`s Modulus 65 GPa.
This combination of factors suggests a faster fatigue crack propagation for the negative stress ratio, in accordance to the obtained experimental data.
Conclusion The negative load ratio affected the fatigue crack propagation rate for the AA 6005 aluminum alloy.

The heat affected zone resulting from the welding is pretty much absent and no cracks were detected.
The resultant weld metals contain higher ferrite levels, and have been reported to have inferior properties.
In that case austenite does not have sufficient amount of time to nucleate and grow and this decrease the amount of austenite in weld metal. [6, 7] The present work has been carried out to investigate the influence of the pulse duration and the focus position on neodymium: yttrium aluminum garnet (Nd:YAG) laser welding of UNS S32205 duplex stainless steel and its effect on size and microstructure of fusion zone then, on the mechanical properties.
Moreover, lower pulse duration extended the heat-affect zone.
This is expected because the mechanical properties of steels, in general, are based on its microstructures.[11] As can be seen in Table 2, the microhardness values increased in the weld metal.

The risk factors affecting reservoir safety are variety, and consequences are serious different, so the model need to invite eight experts to conduct risk assessment for dangerous reservoir.
Experts based on experience, practical engineering, historical data and information in similar projects to screen, monitor, determine risk factors which affect mostly reservoir safety and lead to serious consequence.
In the light of the present situation of reservoir, eight experts pairwise compare risk factors which affect dam safety, spillway, drainage facility to obtain judgment matrix Ai= (Uij)n×n.
It can be seen, risk factors’s weight vector which affect the dam safety is a reasonable.
Determining Risk Factors Membership.

Magnesium alloys usually are heat treated either to improve mechanical properties or as means of conditioning for specific fabrication operations.
Special attention had been focused on the analysis of mutual relations existing between the deformation conditions, microstructural parameters, grain size, and the mechanical properties.
Their inherent strength, lightweight, shock and vibration resistance are factors which make their use advantageous.
Results and Discussion Tensile properties.
[8] E F Volkova, “Effect of deformation and heat treatment on the structure and properties of magnesium alloys of the Mg-Zn-Zr system”, Metal Science and Heat Treatment, 2006, 48(11-12): 508-512

Introduction Due to their superior engineering properties over those of monolithic alloys, silicon carbide particle reinforced aluminum matrix (SiCp/Al) composites have become a large leading material in composite materials and received considerable attention.
Over the past decades, there have been number of studies in machining of SiCp/Al composites, and it is found that the morphology, distribution and volume fraction of the reinforcement phase are all factors that affect the cutting process [4-6], and the main tool wear mechanism in the machining of SiCp/Al composites is abrasion on the flank face and there has been no proof of chemical wear [7].
The material properties of the SiCp/Al composites are, elastic modulus 220 GPa, bending strength 400 MPa, vickers hardness 200 MPa, and the particle size and volume fraction are 60 µm and 56 %, respectively.
Kilickap [6] investigated machining properties of 5 % SiC/Al MMC material using different cutting tools, and they found that the coated carbide cutting tool was suitable to machine SiCp/Al composites and can obtain longer tool life.
Since abrasion is the major form of tool wear for the cutting of the particle-reinforced aluminium matrix composites, the chief factors affecting tool life are the size and the volume fraction of reinforcement particle in the composites.

These material properties are straightly correlated with the microstructure morphology as grain size and crystallographic phases, which is very dependent of the thermal mechanical history and the chemical composition.
An excessive interstitial elements solubilization is very deleterious for the mechanical properties, mainly minimizing the fatigue life due to the well-known alpha-case [1].
Hardness Analysis In sintered materials the hardness depend of the phases, grain size and the hardening condition, among other factors, but it is also much correlated with the presence of pores as well.
On the other hand, microhardness is useful to evaluate the mentioned microstructural characteristics, but pores do not affect it.
It is expected from hardness and microhardness tests that this material may withstand higher mechanical properties than the wrought material.

Producing Steels with Special Properties Using a Jet Heat Treatment System Yuri V.
It is possible to improve the mechanical properties that steel gets after heat treatment by alloying nickel, chromium, manganese and molybdenum.
Ye bo, Energy consumption and its influencing factors of iron and steel enterprise, Journal of Iron and Steel Research International 20(8) (2013) 8–13
Yan, Effects of heat treatment on transverse and longitudinal mechanical properties of engineering machinery steel WQ960 TMS, Annual Meeting (2014) 191–198
Kuzkin, Influence of W addition on microstructure and mechanical properties of Al-12%Si alloys, Materials 12(6) (2019) 981.

Basic mechanical properties of bended tube (diameter 323.9 mm, wall thickness 40 mm) in the supply condition and after heat treatment were determined using tensile, hardness, impact, low-cycle fatigue and creep tests.
Also, there is no material database suitable for such issues, which would include mechanical characteristics and, in particular, creep, fatigue and crack resistance properties of the materials in both their initial condition and during service.
The authors find it appropriate to undertake research oriented towards the determination of relations between the technological parameters of the tube bending process with local induction heating and the mechanical properties of the tube bend material, which should not diverge from the properties of the tubes as delivered.
These parameters depend first of all on the diameter, wall thickness as well as the grade of steel of the bent tube and frequently on the chemical composition and mechanical properties within the same material grade.
The results of mechanical properties tests of the investigated materials are collated in Table 2.

The structure and mechanical properties were studied using various methods.
Process factors.
Methane content in argon is a major factor to affect grain size of the diamond film.
Pretreatment is another factor to affect the grain size of the diamond films.
Mechanical properties.