检索结果-南通市图书馆

Towards a blank design method for manufacturing big-tapered profiled ring disk by spinning-rolling process

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2025年第1期38卷 70-86页

作者： Xuechao LI Lianggang GUO Xiaoqing CHEN Heng LI State key laboratory of Solidification processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China School of Materials Science and Engineering Xinjiang UniversityUrumqi 830017China national key laboratory for precision hot processing of metals Harbin Institute of TechnologyHarbin 150001China CNPC Baoji Oilfield Machinery Co. LtdBaoji 721000China

The big-tapered profiled ring disk is a key component of engines for rockets and missiles.A new forming technology,as called spinning-rolling process,has been proposed previously for the high performance,high efficiency and low-cost manufacturing of the *** design is the key part of plastic forming process *** spinning-rolling process,the shape and size of the blank play a crucial role in process stability,deformation behavior and dimensional *** this work proposes a blank design method to determine the geometry structure and sizes of the *** mathematical model for calculating the blank size has been deduced based on volume conservation and neutral layer length invariance *** FE simulation and corresponding trial production of an actual big-tapered profiled ring disk show that the proposed blank design method is *** order to obtain a preferred blank,the influence rules of blank size determined by different deformation degrees(rolling ratio k)on the spinning-rolling process are revealed by comprehensive FE *** considering the process stability,circularity of the deformed ring disk and forming forces,a reasonable range of deformation degree(rolling ratio k)is recommended for the blank design of the new spinning-rolling process.

关键词： Blank design method Spinning-rolling process Big-tapered profiled ring disk Rolling ratio Intelligent FE simulation

Microstructure evolution of 7050 aluminum forgings during surface cumulative plastic deformation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous metals Society of China 2025年第1期35卷 45-59页

作者： Jian-liang HU Ze-xiong ZHANG Cheng XING Xiu-jiang WU Shi-quan HUANG Hong BO key laboratory of Advanced Forging&Stamping Technology and Science Ministry of EducationYanshan UniversityQinhuangdao 066004China State key laboratory of precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Hebei Engineering Technology Research Center of Metal precision Plastic processing Yanshan UniversityQinhuangdao 066004China State key laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

To elucidate the mechanisms of regulating the microstructure uniformity in 7050 aluminum forgings through surface cumulative plastic deformation(SCPD),the microstructure under different solution treatments was investigated using metallographic observation(OM),electron backscatter diffraction(EBSD),transmission electron microscopy(TEM),and X-ray diffraction(XRD).The findings demonstrate that the most uniform microstructure in the forgings is achieved with a solution treatment at 470℃for 30 *** SCPD process generates a significant number of needle-shaped precipitates,resulting in a higher dislocation density and stored *** treatments alleviate the pinning effect of second-phase particles and facilitate static recrystallization(SRX)in forgings,leading to a reduction in grain ***,mechanical testing results demonstrate 7%−13%increase in tensile strength and more uniform elongation of the forgings in different directions.

关键词： microstructure homogeneity surface cumulative plastic deformation(SCPD) static recrystallization(SRX) dislocation density

Microstructure and mechanical properties of ultra-fine grained MoNbTaTiV refractory high-entropy alloy fabricated by spark plasma sintering

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2019年第11期35卷 2600-2607页

作者： Qing Liu Guofeng Wang Xiaochong Sui Yongkang Liu Xiao Li Jianlei Yang national key laboratory for precision hot processing of metals Harbin Institute of Technology

The MoNbTaTiV refractory high-entropy alloy(RHEA)with ultra-fine grains and homogeneous microstructure was successfully fabricated by mechanical alloying(MA)and spark plasma sintering(SPS).The microstructural evolutions,mechanical properties and strengthening mechanisms of the alloys were systematically *** nanocrystalline mechanically alloyed powders with simple bodycentered cubic(BCC)phase were obtained after 40 h MA ***,the powders were sintered using SPS in the temperature range from 1500℃to 1700℃.The bulk alloys were consisted of submicron scale BCC matrix and face-centered cubic(FCC)precipitation *** bulk alloy sintered at 1600℃had an average grain size of 0.58μm and an FCC precipitation phase of 0.18μm,exhibiting outstanding micro-hardness of 542 HV,compressive yield strength of 2208 MPa,fracture strength of 3238 MPa and acceptable plastic strain of 24.9%at room *** enhanced mechanical properties of the MoNbTaTiV RHEA fabricated by MA and SPS were mainly attributed to the grain boundary strengthening and the interstitial solid solution *** is expectable that the MA and SPS processes are the promising methods to synthesize ultra-fine grains and homogenous microstructural RHEA with excellent mechanical properties.

关键词： Refractory high-entropy alloy Ultra-fine grain Mechanical alloying Spark plasma sintering Mechanical properties

Microstructure and mechanical properties of nickel-based wrought superalloys under thermal-mechanical coupling: A review with Inconel 718,625 as main cases

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2025年第01期 65-82页

作者： Kai Cao Jiangkun Fan Xudong Liu Jianing Zhang Dian Jiao Yuelin Song Fulong Chen Jun Wang Bin Tang Hongchao Kou Jinshan Li State key laboratory of Solidification processing Northwestern Polytechnical University national & Local Joint Engineering Research Center for precision Thermoforming Technology of Advanced Metal Materials Chongqing Innovation Center Northwestern Polytechnical University AVIC Manufacturing Technology Institute

The typical processing and in-service behaviors of nickel-based wrought superalloys involve complex thermal-mechanical coupling effects, including elastic and plastic deformations, phase transformations, and other microstructural evolutions, directly impacting the mechanical properties. This review article provides an in-depth discussion on the microstructural evolution of these superalloys under thermal-mechanical coupling, focusing on two key aspects: the thermoplastic deformation behavior, and the phase transformation behavior in temperature/stress coupled field. The dynamic recrystallization(DRX) behavior during hot deformation and its improvement strategies are discussed in detail. The differences in phase precipitation behavior under conventional heat treatment and thermal-mechanical coupling conditions are compared. The mechanisms driving changes in precipitate characteristics are explored, enabling precise control of precipitates. This article further investigates the intricate relationship between the mechanical properties of nickel-based wrought superalloys and the characteristics of their precipitates, offering guidance for current and future optimizations. It also delves into the latest research advancements in precisely tailoring the precipitates through thermal-mechanical coupling methods to optimize these mechanical properties. Finally, it outlines several promising future research directions in this field.

关键词：

Towards a blank design method for manufacturing big-tapered profiled ring disk by spinning-rolling process

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2025年第1期 75-91页

作者： Xuechao LI Lianggang GUO Xiaoqing CHEN Heng LI State key laboratory of Solidification processing School of Materials Science and Engineering Northwestern Polytechnical University School of Materials Science and Engineering Xinjiang University national key laboratory for precision hot processing of metals Harbin Institute of Technology CNPC Baoji Oilfield Machinery Co. Ltd

The big-tapered profiled ring disk is a key component of engines for rockets and missiles.A new forming technology, as called spinning-rolling process, has been proposed previously for the high performance, high efficiency and low-cost manufacturing of the component. Blank design is the key part of plastic forming process design. For spinning-rolling process, the shape and size of the blank play a crucial role in process stability, deformation behavior and dimensional *** this work proposes a blank design method to determine the geometry structure and sizes of the blank. The mathematical model for calculating the blank size has been deduced based on volume conservation and neutral layer length invariance principle. The FE simulation and corresponding trial production of an actual big-tapered profiled ring disk show that the proposed blank design method is applicative. In order to obtain a preferred blank, the influence rules of blank size determined by different deformation degrees (rolling ratio k) on the spinning-rolling process are revealed by comprehensive FE simulations. Overall considering the process stability, circularity of the deformed ring disk and forming forces, a reasonable range of deformation degree (rolling ratio k) is recommended for the blank design of the new spinning-rolling process.

关键词：

Plastic flow and interfacial bonding behaviors of embedded linear friction welding process:Numerical simulation combined with thermophysical experiment

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2025年第1期38卷 87-98页

作者： Tiejun MA Zhenguo GUO Xiawei YANG Junlong JIN Xi CHEN Jun TAO Wenya LI Achilles VAIRIS Liukuan YU State key laboratory of Solidification processing Shaanxi Key Laboratory of Friction Welding TechnologiesNorthwestern Polytechnical UniversityXi'an 710072China Aeronautical key laboratory for Welding and Joining Technologies AVIC Manufacturing Technology InstituteBeijing 100024China Mechanical Engineering Department University of West AtticaAthens 12241Greece Mathematic and Physic Department Xianjiaotong-liverpool UniversitySuzhou 215123China

In this study,a new linear friction welding(LFW)process,embedded LFW process,was put forward,which was mainly applied to combination manufacturing of long or overlong loadcarrying titanium alloy structural components in *** interfacial plastic flow behavior and bonding mechanism of this process were investigated by a developed coupling EulerianLagrangian numerical model using software ABAQUS and a novel thermo-physical simulation method with designed embedded hot compression *** addition,the formation mechanism and control method of welding defects caused by uneven plastic flow were *** results reveal that the plastic flow along oscillating direction of this process is even and *** the direction perpendicular to oscillation,thermo-plastic metals mainly flow downward along welding interface under coupling of shear stress and interfacial pressure,resulting in the interfacial plastic zone shown as an inverted“V”*** upward plastic flow in this direction is relatively weak,and only a small amount of flash is extruded from top of ***,the wedge block and welding components at top of joint are always in un-steady friction stage,leading to nonuniform temperature field distribution and un-welded *** to the results of numerical simulation,high oscillating frequency combined with low pressure and small amplitude is considered as appropriate parameter selection scheme to improve the upward interfacial plastic flow at top of joint and suppress the un-welded *** results of thermo-physical simulation illustrate that continuous dynamic recrystallization(CDRX)induces the bonding of interface,accompanying by intense dislocation movement and creation of many low-angle grain *** the interfacial bonding area,grain orientation is random with relatively low texture density(5.0 mud)owing to CDRX.

关键词： Embedded linear friction welding Plastic flow Interfacial bonding behavior Numerical simulation Thermo-physical simulation Temperature field Dynamic recrystallization

NUMERICAL SIMULATION OF ATOMIZATION GAS FIELDS IN VARIOUS ATOMIZING PROCESSES

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2002年第3期15卷 279-284页

作者： F.Y. Cao, J.F. Sun, C.S. Cui, J. Shen and Q.C. Linational key laboratory of precision hot processing of metals, Harbin Institute of Technology, Harbin 150001,ChinaManuscript received 10 December 2001 in revised form 31 January 2002 national key laboratory of precision hot processing of metals Harbin Institute of Technology

A Computational Fluid Dynamics Software was used to calculate the atomizing gas fields generated by a self-designed atomizer and to analyze the effects of key atomizing variables such as gas pressure and protrusion length of delivery tube on the gas flow state at the tip of or inside the delivery tube. Increasing the length of delivery tube to a certain extent, the eddy flow region with positive pressure moves away from the tip of delivery tube, which is favorable to achieve the effective atomization of the melt.

关键词： atomization computational fluid dynamics numerical simulation powder metallurgy

Turbulent drag reduction by sector-shaped counter-flow dielectric barrier discharge plasma actuator

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2025年第2期34卷 362-370页

作者： Borui Zheng Shaojie Qi Minghao Yu Jianbo Zhang Linwu Wang Dongliang Bian School of Automation and Information Engineering Xi’an University of TechnologyXi’an 710048China School of Mechanical and precision Instrument Engineering Xi’an University of TechnologyXi’an 710048China Science and Technology on Plasma Dynamics laboratory Air Force Engineering UniversityXi’an 710038China Shaanxi key laboratory of Complex System Control and Intelligent Information processing Xi’an 710048China Shaanxi University key laboratory of Photonic Power Devices and Discharge Regulation Xi’an 710048China

The primary objective in aircraft transportation is to minimize turbulent drag, thereby conserving energy and reducing emissions. We propose a sector-shaped counter-flow dielectric barrier discharge plasma actuator, which leverages jet synthesis for drag reduction. A drag control experiment was conducted in a low-speed wind tunnel with a controlled flow velocity of 9.6 m/s(Re = 1.445 × 10^(4)). This study investigated the effects of varying pulse frequencies and actuation voltages on the turbulent boundary layer. Using a hot-wire measurement system, we analyzed the pulsating and time-averaged velocity distributions within the boundary layer to evaluate the streamwise turbulent drag reduction. The results show that the local TDR decreases as the pulse frequency increases, reaching a maximum reduction of approximately 20.97% at a pulse frequency of 50 Hz. In addition, as the actuation voltage increases, the friction coefficient decreases, increasing the drag reduction rate. The maximum drag reduction of approximately 33.34% is achieved at an actuation voltage of 10 kV.

关键词： plasma flow control turbulent boundary layer turbulent drag reduction

Decomposition of Nb_(3)Si and mechanical-property improvement by adding appropriate amount of MgO in Nb-16Si-20Ti alloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare metals 2023年第4期42卷 1306-1315页

作者： De-Zhi Chen Qi Wang Rui-Run Chen Shu Wang Yan-Qing Su Heng-Zhi Fu national key laboratory for precision hot processing of metals Harbin Institute of TechnologyHarbin150001China

Five Nb-16Si-20Ti-xMgO alloys(x=0,0.1,0.5,1.0 and 3.0)were prepared via arc melting in this study,and the effect of MgO addition on their phase composition,microstructure evolution,and mechanical properties was *** results demonstrated that MgO reacted with the Nb-Si-Ti alloy while Mg atoms replaced Nb atoms in the Nbss *** hypoeutectic alloy was transformed into a hypereutectic alloy upon the addition of 3.0 at%MgO,and the Nb_(3)Si phases decomposed into a fine Nbss/α-Nb5Si3 eutectic *** highest fracture toughness was achieved for the Nb-16Si-20Ti-3MgO alloy,with an ambient fracture toughness value of 9.4 MPa·m^(-1/2)due to its largest Nbss phase content and optimal Nbss/α-Nb_(5)Si_(3)eutectic ***,the alloy compressive strength increased with MgO *** compressive strength of the Nb-16Si-20Ti-3MgO alloy was 2624.1 MPa,26.0%higher than that of Nb-16Si-20Ti,due to the formation of a solid solution of Mg atoms in the Nbss phase and reinforcement of a small amount of the Ti_(2)O ***,an increase in the content of the Nbss/α-Nb_(5)Si_(3)eutectic structure increased both the alloy strength and fracture strain.

关键词： Niobium silicon alloy Magnesium oxide Eutectic structure Fracture toughness