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The amounts of phases in material and porosity fraction were determined by XRD method and image analysis method, respectively.
Acknowledgements This work was financially supported by the Jilin Provincial Science and Technology Department.
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Working above limit temperature for long-term, metal materials of exhaust valve are likely to anneal, which leads to the great reduction in hardness of the valve materials, enlargement in deformation and wear of valve, and even to fracture.
The 21-4NWNb is chosen for the material of valve head, while 40Cr as material of the valve rod.
The property of two kinds of materials are as follows: the modulus of elasticity of the bar and the head are () and (), so as their poisson's ratios 0.277 and 0.3, their densities () and (), their coefficients of thermal expansions () and(), their specific heats ()and (), thermal conductivities 44.0 () and 14.5 ().
Journal of Mechanical Science and Technology.
Journal of WuHan University of Technology. 2002,24(3): 33-36.

The fluid selected is air and the material given is aluminum.
Shah, Offset rectangular plate fin surfaces-heat transfer and flow friction characteristics, Journal of Engineering for Gas Turbines and Power. 90 (1968) 218-228
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Acknowledgements The research was supported by National Science Council of Taiwan, R.O.C.
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To protect the blade, aluminum alloy 6061 is used as the experimental material.
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Materials Science Forum. 1006 (2020) 117–122
Materials Science Forum. 1038 (2021) 9–14
In Materials Science Forum. 1006 (2020) 79 – 86
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In Materials Science Forum. 1006 (2020) 179–184

A variety of software of materials forming simulation has emerged, such as：DYNAFORM, DEFORM, ITAS-3D and so on.
It can also forecast the process of molding material rupture, wrinkling, thinning, springback, and evaluate the formability of the board material.
Therefore, it provides technical support for materials forming process and mold design.
Suppose the tube material is ST16, and the material parameters are given as follows: material density =7.85, Young's modulus =207000Pa, Poisson’s ratio =0.28, Static friction coefficient = 0.125.
[4] Jin-ping Luo: Journal of Suzhou Vocational University in Chinese, Vol.16 (1) (2005), p77

Fu, CO2 fixation using MEA and CaCl2 aqueous solutions, Applied Mechanics and Materials 541 - 542 (2014) 130-133
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Ben amor, Effect og Mg2+, Ca2+ and SO42- ion on precipitation kinetics and microstructure of aragonite, Annales de Chimie Science des Materiaux 33 (2008) 123-134
Feng, Bioactivity of nitric acid and calcium chloride treated carbon-fibers reinforced polyetheretherketone for dental implant, Journal of the Mechanical Behavior of Biomedical Materials (2020) 103497-103524
Yamamoto, Effect of temperature on precipitation rate of calcium carbonate produced through microbial metabolic process of bio materials, Civil Engineering Dimension 18 (2016) 103-108

Methods and materials The image analysis digital measurement process usually takes several steps and operations in order to provide a proper output.
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The types of primary main dam and other four auxiliary dams are all rolled earth dams while the dam materials are loessal clay loam and loam, respectively.
The composition of prisms and layers are coarse-grained materials corresponding to the Mohr-Columb Elastic-Plastic Model.
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