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Introduction As a quenching medium, gas has less thermal conductivity coefficient than oil and spray water, but gas can adjust quenching process according to the special requirement of specimen shape and material, and the thermal conductivity performance of gas can achieve the level of oil and spray water by increasing the velocity or pressure of gas.
(3) During martensite phase transformation, the latent heat is used to increase drive force of phase transformation and to overcome resistance of phase transformation, thus the martensite phase transformation can fulfill. .Acknowledgement The work would not have been possible without the financial support of the Yunnan Key Application Basic Research Foundation (No. 2007A0015Z) and Yunnan Education Science Research Fund (No. 2010Y382).
Journal of Aeronautical Materials, 2004, 24 (4): 14-17 [2] F.
Numerical simulation of heat transfer coefficient during gas quenching process, Materials & Heat Treatment, Heat Machining Technics, 2007, Vol.36, No.2, pp. 70-75 [6] Daniel H Herring, A Review of Gas Quenching from the Perspective of the Heat Transfer Coefficient, Industrial Heating, 2006, 73: 67-75, Industrial Heating, 2005, 72: 49-53 [7] Florent Chaffotte, Didier Domergue, Shahab Kazi, Aymeric Goldsteinas, Xavier Doussot, Optimizing Gas Quenching Technology Through Modeling of Heat Transfer, Industrial Heating, 2005, 72: 49-53 [8] XIE Jianbin.
Kunming University of Science and Technology, 2003

Yoon 1† 1 Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Korea 2 Division of Materials, Korea Institute of Science and Technology, Seoul, 136-791, Korea Keywords: Aluminum alloy, eutectics, electromagnetic force, Al-Si, vibration Abstract.
Niyama: Journal of Metals, Nov. (1987), p.34
Yoon et. al: Materials Science and Technology, Vol. 18 (2002), p.1027.

Rahim Sahar 4,d*, Sib Krishna Ghoshal 5,e* Advanced Optical Material Research Group, Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM, Johor Bahru, Johor Darul Takzim, Malaysia akhaidzir@petroleum.utm.my, babdullahizat@gmail.com, cnatkingcole90@gmail.com, dmrahim057@gmail.com, esibkrishna@utm.my, Keywords: Yb doped tellurite glass; aqueous corrosion; glass; glass corrosion Abstract.
Introduction Undoubtedly, tellurite glasses are very promising material for future technology due to high gain, low phonon cutoff, higher stability compared to other glasses and enhanced nonlinear optical performances .
Glass is highly corrosion resistant compared to most materials.
Acknowledgement The authors gratefully acknowledge the Faculty of Science, UTM for the instrument and facilities provided.
Journal of Materials Science Letters. 4. (1985) 631-634

Its semi-finished product is forged by Titanium Alloy, High Temperature Alloy and other intractable materials.
Experimental Equipments, Materials and Tools.
In this experiment, the necessary equipments, materials and tools are: Vertical Machining Center (850); Horizontal Universal Milling Machine (320mm); Cutting Force Dynamometer (KISTLER 9255B); Transient Signal Recorder (DEWE 3010); two pieces of specimen materials (100mm×81mm×50mm); Plunge milling tool (Φ=12mm); Disc milling tool (Φ=160mm, cutting width=14mm, the number of teeth is 14).
Wang: Journal of Nanjing University of Aeronautics &Astronautics.
Wang: Concise Manual of Metal Cutting (Shanghai Science and Technology Press, China 2007).

Traditional natural materials (metals, alloys and other structural materials) cannot often meet these high and conflicting requirements.
Therefore, new types of structural materials are created on the basis of fundamental and applied research.
One of the widespread types of new materials is plastic mass.
Kulkov, Polymer composite materials.
Mulenkov and others, Russian Physics Journal 5/2, (2012), 151-155.

For the porous material the orifice is uniform and isotropic, ==, yet for most of the porous material, the orifice is anisotropic and not uniform, and the , , are not equal, the permeability of arbitrary direction is as the Eq. 3:
It shall be assumed as follows in the research process of the guideway: (1) The gas flow in the porous material abides by the Darcy’s law. (2) The gas flow in the porous material and clearance is isothermal viscous flow. (3) There exists the influence of the slip flow on the surface of the guideway [6]. (4) The porous material has the characteristics of isotropy, uniform breathability and no surface obstruction.
The material of the guideway adopts Jinan black granite, its main physical parameters are shown in Table1.
Acknowledgements This work is supported by the National Science and Technology Major Project under Grant No.
No.1 (2008), p.52 (in Chinese) [6] S.Yoshimoto and K.Kohno:J.Journal of Tribology.Vol.123 (2001), p.501

They can be used as water reservoir (drinking water, industrial water, and fire water), sewage clarification plant, the storage of discrete or fluid materials, production of biogas from bio-waste, the storage of spent nuclear fuel, etc.
Other advantage of cylindrical tank is lower price of its construction, because of lower material consumption.
The material was steel with Modulus of elasticity E equalled to 210 GPa, Poisson´s constant ν 0.3, bulk density 7 850 kg/m3 and considered material damping 5 %.
Acknowledgement This paper was supported by the VEGA grant no. 01/0629/12 provided by The Grant Agency of Ministry of Education, Science, Research and Sports of the Slovak Republic.
Jendzelovsky, Static analysis of the cylindrical tank resting on various types of subsoil, in: Journal of Civil Engineering and Management, Vol. 18, Issue 5 (2012), pp. 744-751.

Materials and Methods 2.1.
Tshivhase, “Radon, Salinity and Elemental Concentrations of Water Sources within the Kuiseb and Cuvelai-Etosha Basin, Namibia,” Namibian Journal for Research, Science and Technology, vol. 1, no. 1, pp. 55–62, 2018, doi: 10.54421/njrst.v1i1.11
Tshivhase, “Radon, Salinity and Elemental Concentrations of Water Sources within the Kuiseb and Cuvelai-Etosha Basin, Namibia,” Namibian Journal for Research, Science and Technology, vol. 1, no. 1, pp. 55–62, 2018, doi: 10.54421/njrst.v1i1.11
Egun, “Utilization of Water Quality Index (WQI) in Water Quality Assessment of Groundwater in Agbor Metropolis, Delta State Nigeria,” International Science Technology Journal, vol. 10, pp. 48–55, 2017, [Online].
Egun, “Utilization of Water Quality Index (WQI) in Water Quality Assessment of Groundwater in Agbor Metropolis, Delta State Nigeria,” International Science Technology Journal, vol. 10, pp. 48–55, 2017

Materials Science & Engineering A,2019,750
Materials Science & Engineering A,2019,767
Materials & Design,2017,121
Materials Science & Engineering A,2020,798
Materials Science and Engineering A, 2018, 736(OCT.24):323-328.

Acknowledgements The project is partly supported by the National Natural Science Foundation of China (Grant No. 50908243) and Natural Science Foundation of CQ CSTC (Grant No.
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