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Study on CO2 Laser Surface Hardening of 17-4PH Stainless Steel Junwei Zhanga, Gang Leib, Shuchen Panc, Fayu Wud School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China alnkdzjw@163.com, blgwyh1987@163.com, cpanshuchen007@sina.com, dfayuwu@gmail.com Keywords: Laser surface hardening; Stainless steel; Quenching; Aging treatment Abstract.
Experimental Procedures Some 17-4PH stainless steel plates with size of 60×50×6mm were chosen as the substrate materials.
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Among these available chiral selectors, there has been considerable interest in the applications of nano-materials to improve chiral resolution efficiency [4-6].
Due to their unique structure and remarkable mechanical, electronic, magnetic, photonic, and transport properties, carbon nanotubes (CNTs) have been considered as one of the most promising materials since the landmark research in 1991 by Iijima.
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The conclusion that the bearing capacity of the structure is not controlled by the strength of materials, but controlled by the stability of the structure can be obtained.
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Thin film is a class of materials forming bonds in two dimensional plane, and graphene is the most famous among thin film.
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Introduction From a general perspective, a heterogeneous material is composed of regions formed by different materials, phases, or the same material in different states, such as a polycrystal [4].
Progress in Materials Science, 55(6):477–562, 2010
Modeling heterogeneous materials via two-point correlation functions: Basic principles.
Lineal-path function for random heterogeneous materials.
Random heterogeneous materials: Microstructure and macroscopic properties.

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Experimental Materials.
Fig. 5 FT-IR spectrum of Polyurethane Fig. 6 GPC chromatogram for Polyurethane Hydrogen bond in system directly affects the properties of materials.
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The so formed composite material is machinable and suitable for automated production.
Another possibility to follow chemical changes during the crosslinking process is to apply Raman spectroscopy. [3, 4, 7] In Raman spectroscopy the interaction of a laser and the examined sample is used to monitor the chemical structure or the composition of materials.
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NbF5 and CrF3 catalysts effects on synthesis and hydrogen storage performance of Mg-Ni-NiO composites Qi Wan, Ping Li *, Teng Wang, Xuanhui Qu Institute for Advanced Materials and Technology, University of Science and Technology, Beijing 100083, China Corresponding author: bj60106531@sina.com Keywords: Hydrogen storage; Mg-based materials; cryomilling; hydrogen storage performance; kinetics; NbF5 Abstract: Two kinds of novel materials, Mg-1.6mol%Ni-0.4mol%NiO-2mol%MF (MF=NbF5, CrF3), along with Mg-1.6mol%Ni-0.4mol%NiO for comparison, were examined for their potential use in hydrogen storage applications, having been fabricated via cryomilling.
Carbon nanotubes seem to be convenient adsorbent materials, but hydrogen storage capacity limits their potential for hydrogen storage.
It has been shown that Mg-based hydrogen storage materials, prepared with cryomilling, have excellent properties [18].
Firstly, Mg-based hydrogen storage materials fabricated by cryomilling have outstanding activation performance.
[2] Ewa Ronnebro, Development of group П borohydrides as hydrogen storage materials, Current Opinion in Solid State and Materials Science. 15 (2011) 44-51

Friction Correction and Constitutive Equation of a non-quenched and tempered Steel during Hot Deformation Xia Li1, 2a, Xiaoxia Li2,b , Mingyao Li2,c, Xiaochun Wu2,d 1 School of Materials Science and Engineering, Shanghai University, Shanghai, China 2 School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, China alixia@sues.edu.cn, blxxcljg@sina.cn,cankesh@163.com,dxcwu@staff.shu.edu.cn Keywords: non-quenched and tempered Steel, friction correction, hot deformation, constitutive equation.
Fig.2 shows that at the same deformation rate, more higher the deformation temperature is , more lower the resistance to deformation of the material has, so that the peak stress is much lower , and dynamic recrystallization of this material can be easily occurred.
Therfore, proper process should be selected in compliance with material properties and to achieve the requirements of the parts
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