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Study of Microstructure and Mechanical Properties of Hot-Rolled Ultra-High Strength Ferrite-Bainite Dual Phase Steel LI Zhuang1,a*, Lv Wei 2,b 1School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, Liaoning, China 2Land and resources department, Shenyang Aerospace University, Shenyang 110136, Liaoning, China aLizhuang20047@163.com, blw4488@sina.com Keywords: Ultra-high strength ferrite-bainite dual phase steel; fast cooling; low temperature rolling; finish rolling temperature Abstract.
Dual-phase (DP) steel is the flagship of AHSS since it enables use of less material to accomplish more performance, e.g., low yield strength, high work hardening rate, and high uniform elongation [13, 14].
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During the reverse scan, the produced oxide is reduced in the potential range of 0 to -0.4 V versus Ag/AgCl, the typical maxima for Pt and Pd-based materials.
Acknowledgement The author would like to thank Nippon Sheet Glass Foundation for Materials Science and Engineering (Grant No. 6501073) and USM Short Term Grant (Grant No. 6315379) for funding this research.
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The use of new materials and especially fibre reinforced composites makes health monitoring still more important.
Such materials can loose up to 60% of their stiffness and still look unchanged from outside.
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Methods and materials Study Area Gaojianpu Watershed is located in Wangwa Town, Pengyang County, Ningxia Hui Autonomous Region, and belongs to the Puhe River Basin of Jinghe River System, with a total area of ​​1,076.89 hectares and location between 36°3'44"N~36°6'53"N, 106°38'15"E~106°40'43"E(Fig.1).
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Material balance equation of water-drive gas reservoir is pZ[1-Cp+SwcCw1-Swc∆p-We-WpBwGBgi]=piZi(1-GpG) （3） Water storage coefficient ω is defined as ω=We-WpBwGBgi （4） Dimensionless pressure PFD is defined as PFD=pZpiZi （5） Neglecting expansion energy of rock and irreducible water, material balance equation of water-drive gas reservoir is PFD=1-Rg1-ω （6） If gas reservoir is closed, water storage coefficient ω is equal to 0, the relationship curve between dimensionless pressure PFD and gas recovery degree Rg is a diagonal line.
There are two fundamental equations in this method, the first is production index equation of water layer qe=J(p-p) （13） The second is material balance equation of water layer supposing formation water compressibility factor is constant.
According to material balance equation of water-drive gas reservoir (Eq. 3), PH pressure is defined as PH=pZ[1-Cp+SwcCw1-Swc∆p-We-WpBwGBgi] （19） Corresponding value in extension line of initial PF line segment is target value of PH.
Acknowledgements The authors would like to thank the projectssupported byNational Key S&T Special Projects (Grant No.2011ZX05017-001-005HZ) and National Natural Science Foundation (Grant No.51374269). 
Journal of southwest petroleum institute, 2000，22（4）：26-29

Introduction In recent years, with science and technology’s development, neural net was taken account of in the field of predicting properties of material.
Constitutive relationship of metallic rubber was related to density of material, more importantly, related to shape factor of the material in the documents [3~5].
In this paper, coefficients of constitutive relationship of the material in the two conditions that were only different shape factor, different density and shape factor respectively were trained and studied by BP neural net.
Acknowledgement The project was supported by the National Natural Science Foundation of China (No.50805112).
[9] Liu Yannian, Feng Chunbo, and Qiao Xin, “Studies on approximation [10] ability of multilayer feed forward BP networks,” Journal of nanjing university of aeronautics & astronautics, vol. 26, pp.34~39, November 1994

They belong to the group of advanced materials technologies, combining several different methods of surface treatment in one multistage technological process.
Fig. 2 Schematic drawing of the cathode arrangement in the chamber device for carrying arc-evaporation method, Characterization of hybrid layers The created composites underwent investigations aimed at defining their material properties.
Table 3: Parameters of ball-on-disc tribological tests Type of ball Ball load force [N] Length of wear track [m] Radius of wear track [mm] Sliding distance [m/s] Temperature [oC] Al2O3 Ø = 6 mm 10 1000 9 0.1 20 After the tests, wear tracks were scanned using an Interferometric Profilometer by Ducom and the volume of the removed coating material was measured.
Based on the volume of the removed coating material, the wear index W was calculated, according to the following formula: W = V / F × s  (1) where: V  volume of removed coating material [mm3] F ball load force [N] S length of wear track [m] Results The metallographic structures of the gas nitrided layers are presented in Fig. 3.
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