检索结果-南通市图书馆

Journal of Iron and Steel Research International 2024年第1期31卷 264-274页

作者： Neng-yong Ye Guang-liang zhang Tian-yue Huang Ming Cheng shi-hong zhang Lei Wang School of Materials Science&Engineering Taizhou UniversityTaizhou318000ZhejiangChina Institute of Metal Research Chinese Academy of SciencesShenyang110016LiaoningChina

Due to the important role ofδphase's quantity and morphology in the mechanical and fatigue properties of Inconel 718 alloy and its components,it is necessary to renew insights into the effect of cold deformation on theδphase precipitation,especially on the morphology ***,the nucleation and growth behavior ofδphase in cold-rolled Inconel 718 alloy during aging were *** results show that the precipitation rate and volume fraction ofδphase increase with increasing the cold rolling reduction from 10%to 50%.The volume fraction ofδphase reaches equilibrium after 5 h,remaining at 5.98%,6.52%,and 6.79%under different rolling reductions(10%,30%,and 50%),*** nucleation ofδphase mainly occurs on different sites(grain boundaries,new twin boundaries and old twin boundaries)under 10%rolling reduction,whileδphase mainly nucleates on the new grain boundaries of static recrystallization due to 50%rolling *** the growth ofδphase undergoes a process of alternate orientation growth from spherical(nucleation)→short rod(longitudinal orientation growth)→short rod(radial orientation growth)→dynamic *** 10%rolling reduction,δphase tends to grow into the matrix,while under 50%rolling reduction,the orientation grows faster and is easily affected by the grain boundary curvature.

关键词： Inconel 718 alloy Cold rolling δphase Orientation growth Morphology evolution

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

水中氕、氘、氚同位素的分离技术研究现状

核化学与放射化学 2024年第2期46卷 85-99,I0003页

作者：施章宏赵庆凯陈长安中国工程物理研究院材料研究所四川江油621907

氢的同位素氕(H)、氘(D)和氚(T)在医疗、核能、国防等领域都有着广泛的应用,特别是在碳达峰、碳中和的“双碳”背景下,采用氘氚核聚变能被认为是我国的重要能源战略。故实现氢同位素的有效分离具有极其重要意义,然而自然界中氘和氚的相... 详细信息

氢的同位素氕(H)、氘(D)和氚(T)在医疗、核能、国防等领域都有着广泛的应用,特别是在碳达峰、碳中和的“双碳”背景下,采用氘氚核聚变能被认为是我国的重要能源战略。故实现氢同位素的有效分离具有极其重要意义,然而自然界中氘和氚的相对丰度却极低,国内外学者相继开展了广泛的科学研究。本文首先对水中氢同位素分离的技术原理进行了概述;然后,从工程化应用角度,重点综述了电解法、精馏法和化学交换法;从实验室研发角度,重点综述了膜分离法和多孔材料吸附法。最后,对几种典型技术的分离因子和能耗进行了对比分析,并展望了未来水中氢同位素分离技术的发展趋势,以期为水中氢同位素的高效分离提供指导。

关键词：同位素分离氕氘氚

维普期刊数据库博看期刊

Modeling the Dynamic Recrystallization of Mg–11Gd–4Y–2Zn–0.4Zr Alloy Considering Non-uniform Deformation and LPSO Kinking During Hot Compression

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2019年第9期32卷 1122-1134页

作者： hong-Xuan zhang Shuai-Feng Chen Ming Cheng Ce Zheng shi-hong zhang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China

Hot compression tests of Mg–11 Gd–4 Y–2 Zn–0.4 Zr alloy(GWZK114)were conducted at a deformation temperature range of 300–500°C and a strain rate range of 0.01–10.0 *** on systematic microstructure observation,it is confirmed that long period stacking ordered(LPSO)phase displays essential and evolving roles on the dynamic recrystallization(DRX)*** results indicate that the plastic deformation is mainly coordinated by simultaneous exist of LPSO kinking of lamella 14 H-LPSO phase and DRX at 350–450℃,and DRX at 500℃.Further,it is found that the LPSO kinking induced during 350–450℃can delay the DRX.A phenomenological DRX model of GWZK114 alloy is established to be XDRX=***[-0.5((ε-εc)/ε^*)0.91].Non-uniform distribution of plastic strain during compression was considered via finite element method and it ensures a good prediction of DRX fraction under a large plastic ***,an enhanced DRX model,taking its formulation as XDRX={***[-0.5((ε-εc)/ε*)0.91]}(T/(226.8)-1)n,n=3.82ε0.083,is proposed for the first time to capture the hindering effect of 14 H-LPSO kinking on DRX *** predicted results of this enhanced DRX model agree well with the experimental cases,where 14 H-LPSO kinking is dominated or partially involved(300–450℃).Besides,a size model of DRX grains is also established and can depict the evolution of DRX grain size for all the investigated compression conditions with accounting for temperature rising at high strain rates(5 s^-1 and 10 s^-1).

关键词： Mg-11 Gd-4Y-2Zn-0.4Zr alloy Modeling Dynamic recrystallization Non-uniform strain-LPSO kinking

Fracture Characteristics of Fully Pearlitic Steel Wire in Tension and Torsion

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2016年第11期23卷 1206-1212页

作者： Tian-zhang ZHAO Guang-liang zhang shi-hong zhang Ling-yun zhang Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process Shenyang Aerospace University School of Mechanical Engineering Taizhou University Institute of Metal Research Chinese Academy of Sciences

The fracture characteristics of fully pearlitic steel wires with fine and randomly oriented lamellae have been investigated after tension and torsion, respectively. It is found that the predominant fracture mode under small pre- deformation is dimple. The analysis of the colony size and the lamellar structure near the fracture surface indicates that each dimple roots from one colony. A simulation of tensile deformation with several pearlitic colonies based on the real scanning electron microscopy （SEM） observation shows that the plastic deformation concentrates and the stress t^hxialit~＂ is larger ~it the boundaries bf colonies. It demonstrates the microe/＇a^ks initialize at colony boundaries. Thus, the colony size is a significant factor for fracture behaviors under small pre-deformation. On the other hand, the fracture surface is investigated after large pre-deformation via torsion. The results show that fracture characteristics vary with radius from dimples, elongated dimples to the fibrous structure. It indicates that the fracture charac-teristics are dependent on the pre-deformation. The fracture mode under large pre-deformation becomes an anisotropic fibrous structure instead of dimples.

关键词： fracture pearlitic steel wire tension torsion

Influence of Lamellar Direction in Pearlitic Steel Wire on Mechanical Properties and Microstructure Evolution

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2016年第12期23卷 1290-1296页

作者： Tian zhang ZHAO Guang-liang zhang shi hong zhang Ling-yun zhang Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process Shenyang Aerospace UniversityShenyang 110016LiaoningChina School of Mechanical Engineering Taizhou UniversityTaizhou 318000ZhejiangChina Institute of Metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina

During cold drawing of pearlitic steel wire, the lamellar structure becomes gradually aligned with the draw ing axis, which contributes to the ultra high strength. A direct simulation about the mechanical behaviors and microstructural evolution of pearlitic lamellae was presented. A representative volume element （RVE） containing one pearlitic colony was established based on the real transmission electron microscope （TEM） observation. The deformation of pearlitic colony during tension, shear and wire drawing were successfully simulated. The numerical results show that this metallographic texture leads to a strong anisotropy. The colony has higher yielding stress when the la mellar direction is parallel and perpendicular to the tensile direction. The lamellar evolution is strongly dependent on the initial direction and deformation mode. The formation of typical period shear bands is analyzed. In the wire draw ing, the pearlitic colony at the sub surface experiences a complex strain path： rotation, stretching along the die sur face, and rotation back.

关键词： pearlitic lamellae steel wire drawing mechanical property representative volume element

Effect of Cold Rolling Parameters on the Longitudinal Residual Stress Distribution of GH4169 Alloy Sheet

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第12期28卷 1510-1517页

作者： Neng-Yong Ye Ming Cheng shi-hong zhang Institute of Metal Research Chinese Academy of Sciences

For plastic deformed parts, the dimensional accuracy is significantly affected by residual stresses and so does the performance in service. Therefore, the rolling process of GH4169 alloy sheet at room temperature was investigated by finite element method. The effects of rolling reduction, friction coefficient, rolling velocity and initial stress on the longitudinal residual stress distribution over the thickness of GH4169 alloy sheet were analyzed. The results show that the values of longitudinal residual stress can be slightly reduced by increasing the rolling reduction and velocity. The longitudinal residual stress over the thickness distributes as ‘‘V＇＇ type or weak ‘‘W＇＇ type. The initial stress mainly has an effect on the longitudinal stress in the backward slip area. But the friction coefficient has remarkable influence on longitudinal residual stress. With the friction coefficient increasing from 0.1 to 0.5, the value of longitudinal residual stress on the sheet surface is reduced by 282 MPa. Simultaneously, the tensile stress turns into compressive stress with a strong‘‘W＇＇ type distribution.

关键词： GH4169 alloy Cold rolling Residual stress Process parameters

Evolution of Annealing Twins and Recrystallization Texture in Thin-Walled Copper Tube During Heat Treatment

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2020年第12期33卷 1618-1626页

作者： Song-Wei Wang hong-Wu Song Yan Chen shi-hong zhang Hai-hong Li Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 100049China School of Nuclear Equipment and Nuclear Engineering Yantai UniversityYantai 264005China

Thin-walled copper tubes are usually produced by multi-pass float-plug drawing *** general,the annealing treatment subsequently is necessary to release the stored energy and adjusts the *** 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 underwent holding time-free heat treatment was *** backscattered diffraction analysis reveals that a large number ofΣ3 boundaries(600twin relationship)are produced at the early stage of heat treatment,which is due to the lower boundary *** the recrystallization proceeding,the migration rate of grain boundaries decreases on account of the grain growth;meanwhile,the uniqueΣ9 boundaries(38.9°relationship)are formed due to the interaction of theΣ3 *** a result,the number fractions ofΣ3 boundaries and high-angle grain boundaries decrease *** the grain growth stage,a strong recrystallization texture was formed due to the fact that the grains of Goss orientation have a growth advantage over the *** a result,the initial copper texture was transferred into the Goss texture in domination.

关键词： Copper tube Annealing twin Heat treatment Electron backscattered diffraction(EBSD)analysis Recrystallization texture

Wear Behaviors of GH4169 Super Alloy and 3Cr2W8V Tool Steel Under Dry Rolling Condition

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2018年第9期31卷 983-996页

作者： Ge Bian Ming Cheng Yang Liu shi-hong zhang Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China

Wear behaviors of 3Cr2W8V and GH4169 with H70, including surface property, wear performance and friction work, were investigated. 3Cr2W8V and H70 friction pair suffered severer wear and surface damage than GH4169 and H70 friction pair. The wear process had an impact on GH4169 subsurface hardening, but no effect on 3Cr2W8V. Heat energy was a proportion of the total friction work, and 3Cr2W8V consumed more energy than GH4169 during temperature rise. From the numerical calculations, 3Cr2W8V had a more concentrated heat distribution and produced more wear than GH4169. Ultimate tensile strength （σUTS） and uniform elongation （εUE） were considered to evaluate the wear resistance of two materials, and GH4169 had a higher σUTS × εUE value and lower wear degree. In conclusion, the wear mechanism of GH4169 is adhesive wear, and 3Cr2W8V is a combination of abrasive and adhesive wear. Cooling can reduce the wear volume for GH4169 due to good thermal conductivity. The results show that GH4169 is more reliable for the tool material, with a better wear resistance under dry roiling condition.

关键词： Wear Microhardness Temperature Strength-ductile combination

Novel evaluation method for metal workability during cross wedge rolling process

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2021年第3期9卷 473-481页

作者： Ming Cheng Ming-Jie shi Petrenko Vladimir Rui-Xue Wang shi-hong zhang Institute of Metal Research(IMR) Chinese Academy of Sciences(CAS)Shenyang110016People’s Republic of China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026People’s Republic of China Physical-Technical Institute of the National Academy of Sciences of Belarus 220141MinskBelarus

This study presents a novel method using a disk-like sample to assess the workability of metal during the cross wedge rolling(CWR)*** this method,we can quantitatively evaluate the moment destruction which occurs at the center of the sample during *** this study,45 steel was selected to demonstrate the proposed ***,we designed a model for the tools and sample,conducted finite element simulations to analyze the distribution regulations of metal flow,stress,and strain,and evaluated the relationship between the damage and moving distance of the tool during the forming ***,we obtained the optimal deformation temperature range,rolling speed,and geometry parameters for the ***,experiments were conducted from 20℃ to 1200℃ to verify the accuracy of the developed *** was demonstrated that the model was significantly accurate in accessing the workability of 45 steel in the CWR *** proposed method could be generalized to investigate the CWR process for other materials,such as aluminum alloys,superalloys,titanium alloys,etc.

关键词： Cross wedge rolling(CWR) 45 steel Workability Damage Finite element simulation

Deformation Mechanism of AZ31B Magnesium Alloy Under Different Loading Paths

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

Acta Metallurgica Sinica(English Letters) 2015年第12期28卷 1426-1434页

作者： Shuai-Feng Chen Li Zheng shi-hong zhang hong-Wu Song Ming Cheng Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering Shenyang University of Technology

Deformation and texture evolution of AZ31 B magnesium（Mg） alloy sheet under uniaxial tension, compression, and reverse loading after different pre-strain（compression and tension） were investigated experimentally. The results indicate that the pre-compressive strain remarkably affects the reverse tensile yield stress and the width of the detwinning-dominant stage during inverse tension process. Similar to stress–strain curve of the uniaxial compression, the curve of reverse tensile yield value also has ‘S＇ shape, and its minimum value is only 38 MPa. The relationship between pre-compressive strain and the width of detwinning-dominant stage presents a linear growth, and the greater the precompressive strain is, the smaller the strain hardening rate of the detwinning-slip-dominant stage is. Compared with the reverse tension under pre-compression, the influence of the pre-tension deformation on the deformation mechanism of subsequent compression is relatively simple. With the increase in pre-tension strain, the yield stress of the reverse loading is rising.

关键词： AZ31B magnesium alloy Loading path Detwinning Texture Yield stress