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Determination of Recrystallization Kinetics Model of 30Cr2Ni4MoV Steel Based on Dislocation Density Peng Zhoua and Qingxian Mab Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Tsinghua University, Beijing 100084, China azpsarm@foxmail.com, bmaqxdme@mail.tsinghua.edu.cn Keywords: Dislocation density, 30Cr2Ni4MoV steel, recrystallization, inverse analysis.
Materials and Experiment Procedure The 30Cr2Ni4MoV steel used in this research was directly sampled from a 600 t ingot nozzle with a composition of 0.28C-0.02Mn-0.01Si-0.003P-0.003S-1.72Cr-0.41Mo-3.63Ni-0.11V- (bal.)
In order to compensate the inhomogeneous distribution of temperature and strain in the uniaxial billet compression, the following equation is used to reveal the ideal flow curves which is similar to finite element (FE) analysis [13]: σ=F1εn (ε≤εc) (1a) σ=F2expaε-εp2+σs (ε≥εc) (1b) here εc and εp are the critical strain and peak strain of recrystallization, respectively, F1, n, F2 and a the parameters depending on the material and deformation conditions, and σs is the steady state stress when complete dynamic recrystallization is achieved.

Recent developments and Future Potentials of Near Net Shape Casting Belt Casting Technology Hans Fischer1,a , Markus Schäperkötter2,b 1 Salzgitter AG, Eisenhüttenstrasse 99, 38239 Salzgitter, Germany 2 Salzgitter Flachstahl GmbH, Eisenhüttenstrasse 99, 38239 Salzgitter, Germany a fischer.h@salzgitter-ag.de, bschaeperkoetter.m@salzgitter-ag.de Keywords: high manganese steels, EAF, belt casting, HSD-steel Introduction In case that the demands for car body steels and chassis steels are the standard for the assessment whether or not a new car body steel is fit for use, than the material costs are the main criteria for the material selection.
Especially for the last point the forming technology as well as the welding technology, here all thermal welding technologies, are key factors and play an important role, whether or not a new car body steel will find its way in the car.
Since cost effectiveness plays a larger role in today's economical climate, the use of EAF process allows steel to be made from a 100% scrap metal feedstock, commonly known as "cold ferrous feed" emphasizing the fact that for an EAF, scrap is a regular feed material.
These advantages are favourable for the production of high-Mn steels grades since the input materials, such as high scrap content, and the lower energy consumption are relevant to the economical production of these steels.
Since 1989 the plant engineering company SMS Siemag used a belt casting research plant (0,9m width) in cooperation with several partners, e.g. the Swedish steel research institute MEFOS and Technical University Clausthal (TUC) [8,9].

Microstructure and Mechanical Properties of Hyper-Interfacial Bonded Joints of Ultra-Fine Grained High Strength Steels Kazutoshi Nishimoto1, Kazuyoshi Saida2 and Boyoung Jeong3 1 Department of Manufacturing Science, Graduate School of Engineering, Osaka University 2-1 Yamada-oka, Suita, Osaka 565-0871 Japan, nisimoto@mapse.eng.osaka-u.ac.jp 2 ibid., saida@mapse.eng.osaka-u.ac.jp 3 ibid., boyoung@mapse.eng.osaka-u.ac.jp Keywords : Hyper-interfacial bonding, Fusion welding, Ultra-fine grained steels, Microstructure, Hardening/softening, Grain growth, Tensile properties, Impact absorbed energy Abstract.
On the other hand, from a practical viewpoint, welding and joining techniques for the UFG steel are indispensable for being used it as structural materials.
However, the material properties of the heat affected zone (HAZ) in the UFG steel weldment fall down less than the base metal due to the grain growth and softening by weld heat input.
Materials and experimental procedures The chemical composition of the UFG steel used in this study is shown in Table 1.
The width of the HAZ Fig.5 Hardness distribution in hyper-interfacial bonded and fusion welded joints of UFG steel 200 250 300 350 400 450 -2 -1 0 1 2 3 4 5 6 7 Melted zone A AA Distance from bonding interface (mm) Hardness (Hv4.9) TIG welding CO2 laser welding Electron beam welding Hyper interfacial bonding UFG-T steel A Fig.4 TEM microstructure of MA constituent in hyper-interfacial bonded joint of UFG steel 500nm 000 220 220 111 311 111 222 222 311 131 131 402 402 042 440 531 622 042 444 624 804 110 110 020 220 130 110 200 310 110 220 020 130 200 310 Dark field image (martensite) Bright field imageDark field image (austenite) Diffraction pattern Key diagram α' Beam//[0 0 1]α' Beam//[1 1 2]γ α γ Fig.6 Distribution of grain size in hyper-interfacial bonded and fusion welded joints of UFG steel TIG welding CO2 laser welding Electron beam welding Hyper-interfacial bonding A A A A AAAA 178µm ; near fusion

Finite Element Analysis of Reinforce RC Beams Considering Loading History with Pre-Stressed CFRP Sheets Xianpeng Liu 1, a Chang Guo 1, b 1 Key Laboratory of Harbor Marine Structure Safety, Ministry of Communications, Tianjin 300456, China a tiankesuo@163.com (Corresponding Author), b rickguo722@gmail.com Keywords: Prestressed CFRPplate, Secondary load case, Reinforcement, Finite element analysis Abstract.
Table 1 Material Performance Mean Value Index of Concrete Compressive strength[Mpa] Tensile strength[Mpa] MOE [Mpa] 28.6 2.8 3.2E4 Table 2 Performance Mean Value Index of Rebar Material Rebar Diameter [Mpa] Yield Strength [Mpa] MOE [Mpa] 10 319 2.0E5 16 359 2.1E5 Table 3 Performance Mean Value Index of CFRP Plate Material Width[mm] Thickness [mm] Tensile strength [Mpa] MOE [Gpa] 50 1.4 2200 151 Note: Refer to the original data in experiment, combine with the mean value index of low MOE CFRP plate, and take the coefficient of thermal expansion of CFRP plate as 0.6E-6.
Conclusions In this chapter, in combination with the second stress condition in actual engineering, in consideration of external load effect on the rebar-concrete beam, and on the basis of relevant physical experiment data, the establishment of (finite element method) FEM analysis which is able to calculate the prestressed CFRP plate reinforced rebar-concrete beam under the condition of second stress has been studied, which reaches the following research conclusion: (1) According to relevant physical experiment data material, the method of life-death unit controlling and multi-step stress loading is chosen to simulate the second stress process of the reinforced beam.
When the beam is damaged, the material strength of the CFRP plate can be fully exerted

Measurement of the Incident Sound Power in Ducts and Effect factors Analysis Zhao Hai-jun1，a ，Deng Zhao-xiang2，b 1 Department of Mechanical Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China 2 State Key Laboratory of Automotive NVH and safety control，Chongqing 400039, China ahjzhaoly@sina.com, bzxdeng@equ.edu.cn Keywords: Incident sound power, Effect factor, Two-microphone method Abstract: Based on two-microphone transfer function method, the measuring method of incident sound power in duct is introduced, The special test equipment is built, and the test and measurement program of incident sound power in duct is written, and effect factors of measurement are analyzed.
The method was used to measure sound absorption coefficient, acoustic impedance of materials and transmission loss of mufflers.
Two material specimens were tested using the two methods, the results of the analytical and numerical uncertainty methods showed good agreement [4].
When M is 0, it is a condition with no flow, acoustic characteristics of materials and mufflers are often tested in this condition.

Midson2,d, Qiang Zhu3,e and Jianzhong Fan1,f 1General Research Institute for Nonferrous Metals, Beijing 101407, China 2Colorado School of Mines, Golden, Colorado, 80401, USA 3Department of Mechanical and Energy Engineering, Southern University of Science and Technology, 518055, Shenzhen, China alm_grinm@163.com, b*lidaquan@grinm.com, cquwenying2008@163.com, dsmidson@mines.edu, ezhuq@sustc.edu.cn, fjzfan@grinm.com Keywords: SEED, ProCAST, Semi-solid diecasting, Temperature distribution, Heat transfer Abstract.
The material of the slug was aluminum alloy 357 (Al-7Si-0.6Mg), the thermal and physical characteristics of which were calculated by ProCAST using the Scheil model.
The material of crucible was 4140 steel, the thermal and physical characteristics of which was calculated by ProCAST by Scheil model.
Acknowledgement Financial support from the National Key Research and Development Program of China (N0.2016YFB0301001) and Shenzhen Science and Technology Innovation Commission under project (No.
Li, et al., Application of CAFÉ Method on Microstructure Simulation of Semi-solid Al–7%Si Alloy, Chinese Materials Conference 2017 (2018) 819-827

Study on Geomorphologic Spatial Information Mining and Application Liheng Liang 1, a, Lixin Xing 1,b ,Tonglin Li 1,c , Hongyan Jiang2,a, Lijun Jiang 3,d 1 College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China 2 Institute of Geographic Information Engineering of Jilin Province, Changchun 130051, China 3 College of Earth Sciences, Jilin University, Changchun 130061, China asignllh@hotmail.com, bxinglx@jlu.edu.cn, clilaoshi@163.com, djianglijun_2002@163.com Key words: Digital geomorphology; Partial quartic equation; Spatial Analysis; Shuttle Radar Topography Mission (SRTM) Abstract.
Earth’s surface shows significant regional differentiation on account of morphological features, force types and the role of nature, material composition and formation age, thus, it forms different landscape patterns, and these spatial patterns to some extent reflect geomorphologic formation and evolution law.
Materials and method Study area.
Since the Mesozoic era the Neocathaysian tectonic system has controlled the deposition of material and the landscape pattern including the topographic and geomorphologic features (Li, 2004).
Fig.3 Maximum elevation value map Fig.4 Minimum elevation value map The classification of landforms mainly include morphology, the composition of the original material, the formation year and so on, the elevation of the geomorphologic surface and the relative local relief of the land surface are the most basic morphological index and they also indicate the landforms’ endogenic force effect and characteristics in macroscopic.

Evaluation of Oxidative Stress Responses and Neurotoxicity Potential of Methamidophos in Mytilus edulis Yu Zhen1,Jiang Aili2 Department of Biochemical Engineering,Yantai University,Yantai, Shandong Province,China 1Yuzhen5627@163.com,2jal9035@163.com Keywords :Acetylcholinesterase; CAT; GPx; Na+-K+-ATPase; SOD.
The key enzymes for the detoxification of reactive oxygen species in all organisms are superoxide dismutase (SOD, EC 1.15.1.1), catalase (CAT, EC 1.11.1.6) and glutathione peroxidase (GPx, EC 1.11.1.9).
II.Materials and Methods A.
Biological Materials Live specimens of M. edulis, each weighting about 9-10 g, and belonging to the same growth level, were collected from shallow waters of an unpolluted site during May – June, 2007 along the Yantai coast of the Yellow Sea.
Contamination of a dredged material disposal site (La Rochelle Bay, France).

Varying raw materials, new material, product and batch size requirements challenge todays sheet metal forming processes [17].
This will additionally allow to expand tolerances and to procure cheaper materials.
On the other hand, other engineering specifications describing the design of a door also are part of the autonomous production, e. g. a minimum weight.
Radonjic, Behavior of advanced high strength steels in deep drawing processes, Annals of the Faculty of Engineering Hunedoara, vol. 12, no. 1, p. 141, 2014
Milch, Closed-Loop-Control of the Material Flow in the Deep Drawing Process, Advanced Materials Research, 6-8, pp. 321–328, 2005

A Low Frequency Permanent Magnet Passive Vibration Isolator Qiang Li, Dengfeng Xu, Jinchun Hu, Liu Hao State Key Laboratory of Tribology, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing, 100084, China.
Introduction Research on the vibration isolating systems characterized by strongly nonlinear magneto-elastic force and stiffness has gained interest in recent years thanks to the advanced rare earth permanent magnet materials [1].
Therefore, the properties of these permanent magnet materials have attracted many engineers and researchers to explore novel magnetic suspension vibration isolators.
The advanced Nd-Fe-B35 material is chosen.
Firstly, the rubber membrane is a kind of hyper-elastic material.