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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.

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 and measurement showed that the quantity of inclusions was decreased and the mechanical properties were improved.
Inclusions not only affect the properties of magnesium alloy, but also cause the loss of molten magnesium.
By analyzing and testing the change of inclusion in type, quantity, size and mechanical properties, the factors affecting mechanical properties were discussed, which would set the foundation for further enhancing the mechanical properties of magnesium alloy. 2 Experimental Mg, Al, Zn, Mn and a little amount of La were used as raw materials in experiment.
The average crystal grain area of AZ91, 3575µm2 [7] was bigger than that of the sample, 875µm2, which was decreased by 76%. 3.4 Mechanical properties The tensile properties of the sample were shown in Table 2.
It can be expected that the better mechanical properties of sample would have been attained, if rear earth was added in the AZ91 and the raw materials of high purity were used in the experiment. 5.

The paper deals with the properties, quality and durability of the exposed concrete.
Chemical and physicochemical processes in which concrete breaks while reducing the main physical and mechanical properties of concrete are collectively called concrete corrosion.
These are mechanical, physical and chemical properties.
The colors balance of concrete influences many factors.
Another important factor affecting coloring is the compaction process of the deposited mixture.

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.

Optimization of GMAW parameters to improve the mechanical properties S.Saravanan1, a*, P.Pitchipoo2, b 1&2 Department of Mechanical Engineering, P.S.R.
Shih Jing-Shiang et al [2] optimized the pulsed GMAW process parameters used for aluminum alloy plate to improve the mechanical properties.
The results of several literatures [8-12] have revealed that welding parameters such as welding voltage, welding current, gas flow rate, wire feed rate, wire size and welding speed significantly affect the mechanical properties of welded joints.
Selection of an appropriate orthogonal array for experiments depends on the number of factors and the number of levels.
However, GRA requires less data and can analyze many factors that can overcome the disadvantages of statistics methods.

Prediction of Microstructure and Mechanical Properties of Weld Metal in Hybrid Laser-arc Welding V.A.
Calculation technique in order to reconstruct the 3D temperature field and predict the microstructure and mechanical properties of the weld metal in hybrid laser-arc welding is developed.
Prediction of Microstructure and Mechanical Properties Solution of the inverse heat conduction problem presents all parameters of the apparent heat source.
The mechanical properties can be evaluated under calculated thermal cycle theoretically by using known models [2] or experimentally by testing specimens.
The proposed procedure allows to evaluate the distribution of microstructure and mechanical properties of weld metal with consideration for real weld geometry.

However, when nano MgCO3 content was higher than 4%, the mechanical properties of coatings decreased.
Therefore, how to improve the mechanical properties has become the focus of the study.
The main factors affecting the modification of waterborne UV-curing wood coatings were the content of MgCO3, drying temperature and time of UV radiation [12].
When these three factors were optimized by orthogonal experiment, the mechanical properties of coatings could be optimized.
The three factors have effect on mechanical property of waterborne UV-curing wood coatings.

Different properties of single fly ashes are affected by various factors, e.g. the coal quality, different combustion conditions, heating plant operation conditions.
Mechanical properties of fly ash based mortars after 7 days of hardening [N.mm-2].
Therefore, achieved mechanical properties of specimens based on particular fly ashes were different due to the variability in the properties of the tested fly ash.
The total content of leached ions affected the mechanical properties of mortars based on alkali activated fly ashes.
Ban, An overview on the influence of various factors on the properties of geopolymer concrete derivedrom industrial by-products, Constr.

Mechanical Properties of Surface Mortar with Waste Crumb Rubber Gang Xue , Chunfeng Wu Architecture and Civil Engineering School, Inner Mongolia University of Science and Technology, Baotou 014010, China Key Words: waste rubber；surface mortar；mechanical properties Abstract.
The results show that rubber particles mortar possess excellent toughness, impact resistance and heat aging properties.
The mechanical properties of rubber particle surface mortar should accord with national standards, meanwhile，the impact resistance and heat aging should guarantee to meet the service requirements.
So the material can resist the change of external environment factors and keep the original fine performance without damage during the long-term use [3-4].
Mechanical properties of fiber reinforced concrete after high temperature [J].