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Application of Low-penetration Concrete as the Protecting Layer in Wuhan Yangtse River Tunnel Tube杨雷摘 要:<正>Based on the Wuhan Yangtse River Tunnel Project, the low-penetration fiber concrete used in the protecting layer of Wuhan Yangtse River Tunnel tube has been studied in this paper. With the effect of silica fume, slag and polypropylene fiber......
Failure Behavior of Thermal Barrier Coatings on Cylindrical Superalloy Tube Under Thermomechanical FatigueZhubing CHEN1,2,Zhongguang WANG2,Shijie ZHU31. Shenyang Aeroengine Research Institute... Institute of Technology摘 要:Failure behavior of thermal barrier coatings on cylindrical superalloy tube was investigated under thermomechanical fatigue(TMF......
线性方程组,需要借助多次迭代求解,无法给出临界失稳压力的解析表达式,不适合工程应用中起皱规律的探讨研究.本文作者为探求管材材料性能和成形几何条件等主要参数对缩径成形过程中弹塑性失稳的影响规律,忽略管材初始缺陷的影响. 图1 管坯外压缩径原理图 Fig. 1 Schematic diagram of tube outer pressure compression... preparation (Unit: mm) 拉伸试验测定得到的试件真实应力-应变曲线见图8.材料在两种不同热处理条件及上述拉伸条件下的本构关系按幂指函数模型式(15)拟合后的本构方程参数K,n以及拟合精度均方差见表1. 图8 AA7075管材真实应力-应变曲线 Fig. 8 Axial true stress-strain curves of AA7075 tube 表1......
Microstructure evolution of a recycled Al-Fe-Si-Cu alloy processed by tube channel pressingM.H.Farshidi1,M.Rifai2,H.Miyamoto21. Department of Materials Science and Metallurgical Engineering, Ferdowsi... specimens of the mentioned alloy were subjected to different numbers of passes of a recently developed SPD process called tube channel pressing(TCP); their microstructures were then studied using......
Evolution of Annealing Twins and Recrystallization Texture in Thin-Walled Copper Tube During Heat TreatmentSong-Wei Wang1,2,Hong-Wu Song1,Yan Chen1,Shi-Hong Zhang1,2,Hai-Hong Li31. Institute of Metal... is necessary to release the stored energy and adjusts the microstructure.In this study,an investigation on the evolution of annealing twins as well as textures in the thin-walled(Φ6 mm × 0.3 mm) copper tube......
" name="ChDivSummary">We investigated erosion-corrosion(E-C) and its mitigation on the internal surface of the expansion segment of N80 steel tube in a loop system using array electrode technique, weight......
Oxidation and thermal fatigue of EB-PVD thermal barrier coatings on tube superalloy substrate GAO Yu, ZHANG Chun-xia, ZHOU Chun-gen, GONG Sheng-kai, XU Hui-bin Department of Materials Science...) (NiCoCrAlY (bond coat)+(6%-8%, mass fraction) Y2O3-stabilized ZrO2(YSZ top coat)) were deposited by electron beam physical vapor deposition (EB-PVD) on tube superalloy substrates. The samples were......
defects including wrinkling, cracking, pitting and folding appear if the internal pressure and the axial feeding and transversal stroke are not appropriate. The shear hydro-bent tube is performed..., in which the tube can be successfully formed without defects. Key words: aluminum alloys; hydroforming; shear hydro-bending; rectangular tube 1 Introduction In recent years, hydroforming has been......
Trans. Nonferrous Met. Soc. China 27(2017) 608-615 Sequential multi-objective optimization of thin-walled aluminum alloy tube bending under various uncertainties Heng LI1, Jie XU1, Heng YANG1, He...) method, a sequential multi- objective optimization of larger diameter thin-walled (LDTW) Al-alloy tube bending under uncertainties was proposed and implemented based on the deterministic design......
出现少量孪晶. 图3 TP2铜管轧制态金相组织 Fig. 3 Metallographic of copper tube after rolling 2.2 拉拔变形铜管组织结构的演变 图4所示为不同拉拔道次后铜管金相组织.由图4可见,沿拉拔方向晶粒形貌尺寸发生显著变化,随着变形量的增加,晶界趋于平行拉拔方向并形成纤维流线且晶界宽度增加,晶粒破损严重；周向晶粒...并发生转动,择优取向明显,织构逐渐加强；由图6(b)可见,{101}晶面逐渐趋向于平行观察面,成为主要取向. 图4 不同拉拔道次铜管金相组织 Fig. 4 Metallographs of copper tube after drawing passes 图5 不同状态铜管样品取向成像图 Fig. 5 IPF images of copper......
