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Study on the Microstructure and Mechanical Properties of 15CrMoR Hu Xiaodong 1, a , He Qingkun 2, b, Lv Jiantao 1, Zhang Yong 1 1 College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China 2 School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China a huxdd@sohu.com b qingkunhe@sina.com Keywords: 15CrMoR, Weld joint, Microstructure, Mechanical properties Abstract: The butt weld sample with the material of 15CrMoR has been manufactured with the bonding methods of manual electric arc welding (SMAW) and submerged-arc welding (SAW).
The main objective of this paper is to study the microstructure and the mechanical properties in the butt-weld joint made with the material of 15CrMoR steel. 15CrMoR Plate and Welding Methods The chemical composition of 15CrMoR plate with the thickness of 55mm in this paper is shown in Table 1 with the organization of pearlite and ferrite in room temperature.
Conclusions The relationship of microstructure and mechanical property of butt weld seam welded with mitiple-layers made with the material of 15CrMoR has been studied in this paper, and conclusions have been obtained as follows: (1) Only the last weld layer has the typical weld organization including weld zone, heat-affected zone (HAZ) and fusion zone, and the previous weld seam is affected by thermal cycling during the later weld operating. (2) The microstructure of the former weld seam is heat-treated into the complicate organization including Widmanstaten, fusion zone, overheated area, normalized zone, partial phase transformation area for the heat-treatment of later welding layers. (3) The comprehensive mechanical properties of the multi-layer weld joint is better than the monolayer weld joint for the normalized zone and the partial phase transformation zone produced in the weld seam by the later welding.
Han: Journal of Materials Engineering, Vol. (2001) No.18, P.27.

Fig.1 Top view of buildings and tunnels (m) Fig.2 The Chart of grid delimiting Table 1 Physico-mechanical parameters of materials Member Density (kN.m-3) Modulus of elasticity (MPa) Poisson ratio C (kPa) θ (°) Clay 18.7 20 0.35 19 26 Wall 25 3000 0.20 Foundation 25 31500 0.20 Lining 25 34500 0.17 Shield shell 78.5 210000 0.30 The implementation of shield tunnel construction.
Acknowledgements This work was financially supported by The Chinese National Natural Science Foundation (51078332)，Zhejiang Natural Science Foundation (Z1100016) and Hangzhou Key Discipline.
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The material of the rod is QT600-3 and the thermo-physical properties of the material are given in Table 1.
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Each pattern is the reflection of manufacturing process changes such as a change of raw materials, equipment damage or the state of workers.
Acknowledgements This study is supported by the Natural Science Fund of China (No. 50675005), the Natural Science Fund of Beijing City (No. 09C0003 and No. 3072005) and PhD.
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Acknowledgements This investigation is supported by the National Nature Science Foundation of China (No.10372076), for which the authors are grateful.
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Main Parameters Analysis of the Solar Street Lamp in Campus Shengxian Wei1,a, Xiongwei Bi2, Youming Shi1, Huimin Yang1 1 Key Laboratory of Yunnan Provincial Universities for Advanced Functional and Low Dimensional Materials, Qujing Normal University, Qujing 655011, China 2 College of Science, Honghe University, Mengzi 661100, China a Corresponding author: wsx_8600@163.com Keywords: Solar street lamp; Solar cell; LED lamp; Battery capacity; Mathematical model Abstract.
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