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Study on the microstructure control and the variation of mechanical properties of pearlitic steel Lunyou Li1,a, Yu Liang2,b*, Zemin Wei2,c, Hu Xiong2,d, 1Guizhou Wire Rope Incorporated Company, Zunyi, 563000, China; 2 School of Materials and Metallurgy, Guizhou University, Guiyang, 550003, China a13708525662@163.com, bxq.liangyu@126.com, c346602059@qq.com, d1146532648@qq.com Key words: pearlitic steel; microstructure; mechanical properties Abstract:The effect of austenitizing temperatures and isothermal transformation temperatures on microstructure size and mechanical properties of 70 steel was studied.
Grain size/µm Colony size/µm Interlamellar spacing/nm 1 41.55 7.63 173 3 40.36 6.36 150 4 25.46 5.45 152 6 24.38 5.07 144 According to the changing trends of the mechanical properties, the samples, which austenitizing at 1000 ˚{TTP}730 C, has coarser grain, and the comprehensive mechanical properties is lower than the one austenitizing at 860 ˚{TTP}730 C generally.
With the decrease of isothermal temperature, the mechanical property is increasing.
Fig.3 Mechanical properties.
Mechanical properties of samples 1, 2 and 3, which have a coarser grain size, show that grain size is the main reason affecting the tensile properties.

The factors that are affecting the property of natural cellulose fiber in fiber-reinforced concrete [3].
The applicability of dispersed fiber in concrete production as a building material improves its entire mechanical properties in concrete [5].
Due to two main factors: Cost and availability, natural fiber-based eco composite materials are more suitable for use than biodegradable polymer materials.
Thus, the corresponding composites provide good mechanical properties.
Kumar, “Study of Mechanical Properties of Bamboo fibers before and after Alkali Treatment,” vol. 13, no. 7, pp.5251-5255, 2018

The results show that the spindle speed and voltage are mainly two factors to affect cutting depth of the workpiece.
The study applies the orthogonal experimental method to design a set of experiments, analyzes the various parameters which affects the depth of electrolysis mechanical composite cutting, and identifies the key influencing factors to summarize the laws.
When take the factors which affect cutting depth of the workpiece in the NC electrochemical-mechanical composed cutting process into deep consideration, parameters of the experiment are identified as: voltage, Electrolyte pressure, electrolyte temperature, spindle speed and electrolyte concentration.
The experiment is based on the L16 (45) orthogonal table and factors level table is shown in Table 1.
The fluctuations of the data in the figure should be the interferences of other factors.

The presented paper deals with the experimental assessment of the impact of increase pressure on the mechanical properties and homogeneity of a die cast.
The castings cast under pressure during solidification are characterized by better mechanical properties and by increased airtightness.
Influence of increase pressure upon the values of mechanical properties Influence of increase pressure changes on mechanical properties study was performed on experimental samples (Fig. 4 - alternator flange castings) and (Fig. 5 - testing bar taken from the gating system appointed for static tensile test).
When the experiment has been carried out constant and variable technological factors have been determined and the impact of these factors on the values of mechanical properties has been observed: Constant technological factors: plunger pressing speed: 2.6 m.s-1, liquid alloy temperature: 705°C, mold temperature: 200°C, pressing chamber diameter: 70 mm and Variable technological factors: increased pressure: 13; 22 and 25 MPa.
Pasko, Influence of technological factors of die casting on mechanical properties of castings from silumin, Lecture Notes in Electrical Engineering 240 (2013) 713-722

Compression performance of pultruded GFRP (Glass Fiber Reinforced Plastics) can be improved by confined CFRP (Carbon Fiber Reinforced Plastics) sheet, but it was affected by some factors.
Different compression performances on different specimens were found in the experiments, so the influence factors should be studied.
Because of the discreteness of the strength parameters, the numerical simulation method was used to study the influence factors.
The ultimate fracture strain of CFRP sheet can be changed by the thickness of it when the mechanical property of single layer is certain.
Compression performance of CFRP sheet confined GFRP pipe is affected by the mechanical material property of GFRP pipe and CFRP sheet.

Effect of hydrogen on mechanical properties of pipeline API 5L X70 steel T.Bellahcene1,a, J.
The aim of this work is to study the effects of hydrogen absorption on mechanical properties of pipe API 5L X70 steel.
The mechanical properties in static conditions, fracture and fatigue are determined.
Results and discussions 3.1 Static properties The specimen geometry is presented in Fig. 2.
This light difference confirms the tendency of the static mechanical properties. 3.3.

Analysis of the main factors affecting the surface morphology of FSJ joint Yongfang Deng Dunwen Zuo Bo Song College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China, 210016 xyzqdeng@163.com Keywords: FSJ Factors analysis surface morphology arc lines Abstract.
Since FSJ was invented, many works have been punished to address the microstructure texture and mechanical properties of FSJ joints.
In order to investigate the main factors for FSJ processing affect the surface topography of joint, the following tests were carried out: 1.
Recent advances in friction-stir welding – Process, weldment structure and properties [J].
Microstructures and Mechanical Properties of Banded Textures of Friction Stir Welded 7075-T6 Aluminum Alloy [J].

The plasticity correction factors are analyzed using a calculation strategy based on the comparison between linear elastic and elastoplastic analyses.
This motivates the establishment of the calculation strategy of Ke factors of new material, which is the foundation of the fatigue analysis of titanium alloy materials.
(3) Based on the physical and mechanical properties of titanium alloy TA17, the influence factors, , is obtained by the elastic and elastic-plastic analysis of titanium alloy; (4) Based on the conclusion of verification calculations of austenitic stainless steel, the correlation coefficients A, B, C and m, n in formula (3) and (4) of TA17 are determined. 2.3 The main factors affecting Ke Several different effects can cause elastic-plastic strains in a component, the main factors to be considered in the impact Ke are: (1) Load mode: two control modes, stress control and displacement control, are discussed
The influence of uniaxial tensile behavior on the elastic plasticity correction factor is considered by selecting material properties under 30 ℃ and 350℃.
The results of these verifiction calculations are provided under different combinations of four influencing factors, (mechanical/thermal/both mechanical and thermal loadings), multi linear elastic-plastic material model and chaboche material model, temperature 30 ℃ and 350℃, load controlled and displacement controlled loads, to analysis by elastic-plastic finite element method and simplified elastoplastic analysis to get the and respectively.

Difference in the mechanical properties observed between both methods is attributed to the presence of a metal disk attached to the non-metallic sample for electromagnetic.
The cantilever beam type specimen is usually used to determine the damping properties of the material.
As a result of the loss factor is also affected.
However, the good agreement of these properties obtained by both methods for the metallic sample ascertains the reliability and advantages of the method.
References [1] ASTM E 756, Standard test method for measuring vibration-damping properties of materials (1998) [2] ISO 6721-1, Plastics - Determination of dynamic mechanical properties, Part 1 - General principles (2001) [3] ISO 6721-3, Plastics - Determination of dynamic mechanical properties, Part 3 - Flexural vibration resonance curve method (1994) [4] M.D.

Mechanical and Physical Properties of Nano-Metals Malgorzata Lewandowska1,a, Andrzej Zagorski1,b, Krzysztof J.
The aim of this paper is to review recent results on mechanical and physical properties of nano-metals produced by hydrostatic extrusion.
Mechanical Properties Nano-metals, in general, exhibit very high yield stresses as grain size is a prime microstructural parameter affecting the mechanical strength.
Summarizing considerations given above, it is worth noting that although grain size refinement down to nanoscale offers a great possibility to improve mechanical strength, there are factors limiting grain size strengthening.
Fatigue strength is one of the most important mechanical properties of engineering materials.