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Optimization of rolling process for Bi(2223)/Ag Superconducting Tapes by a Statistical Method

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Rare Metals 2001年第1期20卷 66-68页

作者： Xuefeng Li, Peiwen Hua, Wenquan Wang, Qijian Jin, Yiru Zhou, Guansen Yuan (General Research Institute for Nonferrous Metals, Beijing 100088, China) Gen Res Inst NonFerrous Met Beijing 100088 Peoples R China

Ag-sheathed (Bi,Pb)(2)SoCa(2)Cu(3)O(x) tapes were prepared by the powder-in-tube method. The influences of rolling parameters on superconducting characteristics of Bi(2223)/Ag tapes were analyzed qualitatively with a statistical method. The results demonstrate that roll diameter and reduction per pass significantly influence the properties of Bi(2223)/Ag superconducting tapes while roll speed does less and working friction the least. An optimized rolling process was therefore achieved according to the above results.

关键词： Bi(2223)/Ag multifilamentary tapes rolling process statistical method optimization

Modeling texture evolution during rolling process of AZ31 magnesium alloy with elasto-plastic self consistent model

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Transactions of Nonferrous Metals Society of China 2011年第6期21卷 1348-1354页

作者：黄诗尧张少睿李大永彭颖红上海交通大学机械与动力工程学院机械系统与振动国家重点实验室上海200240

To gain a better understanding about texture evolution during rolling process of AZ31 alloy, polycrystalline plasticity model was implemented into the explicit FE package, ABAQUS/Explicit by writing a user subroutine VUMAT. For each individual grain in the polycrystalline aggregate, the rate dependent model was adopted to calculate the plastic shear strain increment in combination with the Voce hardening law to describe the hardening response, the lattice reorientation caused by slip and twinning were calculated separately due to their different mechanisms. The elasto-plastic self consistent （EPSC） model was employed to relate the response of individual grain to the response of the polycrystalline aggregate. rolling processes of AZ31 sheet and as-cast AZ31 alloy were simulated respectively. The predicted texture distributions are in aualitative a^reement with experimental results.

关键词： AZ31 alloy texture rolling process elasto-plastic self consistent (EPSC) model

Study on the rolling process of 1J22 Soft Magnetic Alloy

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Study on the Rolling Process of 1J22 Soft Magnetic Alloy

Study on the rolling process for thin HSLA heavy plates

中国材料大会2012

作者： Chao Gan Jie Zhu State Key Laboratory For Advanced Metals And Materials University of Science and Technology Beijing

ISBN: (纸本)9783037856079;3037856076

The nearly stoichiometric Fe-Co alloy is well known as soft magnetic materials with high saturation magnetization and Curie temperature. However, the application is restricted by its brittleness and poor machinability. For this reason, we studied the rolling process of this alloy. Firstly, the effect of final thickness of hot rolling on the cold rolled samples showed that there was little difference for these cold rolled samples, and the thinner hot rolling samples were not so easy to crack during the cold rolling. Secondly, the soft magnetic properties were found to be better under the 1050℃ water quench when we studied the influence of different solution temperature on soft magnetic properties. Thirdly, with the increase of annealing time, grain size and soft magnetic properties of 1J22 alloy increased, whereas mechanical properties decreased.

关键词： 1J22 alloy rolling process High saturation magnetization Heat treatment

来源： cnki会议评论

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cnki会议

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Baosteel Technical Research 2010年第S1期4卷 37-页

作者： KONG Wei,LIU Fu and ZHANG Xi Heavy Plate Mill,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China

Analyzed and studied the characters of high strength low alloy steel which contain Mo,Cr,Nb and *** actual rolling,combining the feature of rolling mode,and exploiting the equipment advantage of 5 m Heavy Plate Mill,optimized the material design,heating temperature and rolling method, stabilized rolling process of thin alloyed steel,the quality index was advanced.

关键词： high strength low alloy steel thin plate heavy plate mill rolling process

Comparison of microstructures and mechanical properties between forging and rolling processes for commercially pure titanium

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Transactions of Nonferrous Metals Society of China 2012年第8期22卷 1939-1946页

作者：徐春朱文峰上海应用技术学院材料科学与工程系上海201418 同济大学机械工程学院上海200092

In order to reveal the differences caused by forging and rolling process for titanium ingots, hot compression behavior, mechanical properties and the microstructures of forged billets and rolled ones were investigated in detail using Gleeble-1500 thermal mechanical simulator, universal testing machine and optical microscope （OM）. The compression deformation experimental data of commercially pure titanium （CP-Ti） were mapped to be a T vs lg diagram in which data fall into three distinct regions, i.e., three-stage work hardening, two-stage work hardening and flow softening, which can be separated by border lines at 17.5 and 15.4 for lg Z, where Z represents the Zener-Hollomon parameter. The deformation twin is found to have higher Z-value corresponding to the work hardening region. The differences in microstructures and mechanical properties for two kinds of billets indicate that forged billet consists of deformation twins and some twin intersections, and many twins cross the grain boundaries. However, nearly no twins can be seen in the microstructure of billet formed by rolling under optical microscope （OM）, but there are equiaxed and platelike grains. Tensile tests and Vickers hardness test indicate that yield strength, tensile strength and microhardness of the samples after forging are higher than those after rolling.

关键词： commercially pure titanium(CP-Ti) forging process rolling process microstructures mechanical properties

Effect of Niobium Addition on Hot Deformation Behaviors of Medium Carbon Ultra-high Strength Steels

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Journal of Wuhan University of Technology(Materials Science) 2017年第1期32卷 162-172页

作者：杨秀芝张李超史玉升 YU Shengfu HUA Wenlin Hubei Polytechnic University Huangshi 435003China State Key Laboratory of Materials processing and Die&Mould Technology School of MaterialsScience and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The hot deformation behaviors of two medium carbon ultra-high strength steels with different niobium contents were investigated by using Zener-Hollmom parameter and processing map,and the effect of niobium addition on the hot deformation behavior of medium carbon steel was *** hot compression tests were conducted on a Gleeble-3500 thermo-mechanical simulator deformed at temperatures from 850 to 1 200 ℃ and strain rates from 0.001 to 1 s^-*** processing maps of two test steels were built at a true strain of 0.7 based on dynamic materials model（DMM）.There are two peak efficiency domains and two flow instability regions in both test ***,the peak efficiency domains of Nb-bearing steel move to higher temperature due to the inhibition of dynamic recrystaUization（DRX）,and the instability domains of Nb-bearing steel are enlarged due to the precipitation of Nb-containing particles during hot *** optimum process parameters of Nb-bearing and Nb-free steels for industrial production were determined according to the processing map and the microstructural observation.

关键词： Nb addition hot workability processing map rolling process

Superplastic elongation characteristic of fine grained magnesium alloy ZK60

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Rare Metals 2010年第4期29卷 421-425页

作者： LEE Shyong CHIANG Chihte LEU Jyhshyan CHEN Yunghung Department of Mechanical Engineering National Central University Chun Shan Institute of Science and Technology

This paper employs simple rolling process plus annealing to refine the grain size of magnesium alloy ZK60. This goal is effectively achieved, obtaining grains as fine as -3.7 um. Such a specimen shows an elongation of 642%, and its ultimate fracture surface exhibits intergranular separation and significant grain growth. Additionally, the effects of the specimen＇s geometry and tensile test axis with respect to the rolling direction on superplastic elongation is studied, which has not been done before.

关键词： magnesium alloy superplastic elongation rolling process grain refining

INFLUENCE OF ROLL DIAMETERS ON DEFORMATION BEHAVIOUR OF HIGH TEMPERATURE SUPERCONDUCTING TAPE

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Chinese Journal of Mechanical Engineering 2007年第4期20卷 75-78页

作者： LEI Liping ZHAO Yinghong ZENG Pan Key Laboratory for Advanced Materials processing Technology Beijing 100084 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China

During plastic process, the material flow is strongly influenced by the contact area between deformed workpiece and die. In rolling process, difference of roll diameter makes the contact area between roll and deformed tape different, which leads to different material flow and the distribution of powder density. A numerical modelling of the first rolling process for 61-filament high temperature superconducting tape is constructed and the influences of roll diameters on deformation behavior of the tape are discussed. It can be found that the BiSrCaCuO （BSCCO） powder in the center of the tape has higher relative density than those in the periphery of the tape during rolling process. With the increase of roll diameter, the length of the contact arc in the roll gap expands which lead to the increasing of transversal strain and the decreasing of the related longitudinal strain. It makes the value of longitudinal strain ratio decrease gradually, which decreases the possibility of occurrence of the transversal shear band, simultaneously it increases the risk of occurrence of longitudinal crack.

关键词： Roll diameter rolling process Filament Relative density

Study on Microstructure and Properties of Pure Ti flat Wire

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Organic Polymer Material Research 2020年第1期2卷 11-17页

作者： Bojian Wang Xiaochen Ge Qiang Liu School of Metallurgy Engineering Xi’an University of Architecture and TechnologyXi’an710000China Engineering Practice and Training Center Northwestern Polytechnic UniversityXi’an710000China

The titanium round wires could be prepared to the high precision flat wires with the sizes of 0.63mm×5.03mm by nine-pass cold continuous rolling *** property and metallograph analysis were used to analyze the possibilities of preparing flat *** show that the grain kept equiaxed grain in the rolling processes,and a large number of dislocation and a small amount of twin existed in the microstructure of final rolling flat *** the whole rolling processes,when the accumulated rolling deformation degree was at low degree,the deformation of titanium was controlled under the mutual control of dislocation slip and *** the accumulated rolling deformation degree was at high degree,the deformation of titanium was controlled by the dislocation slip.

关键词： Flat wire rolling process Microstructure evolution Deformation Peroperties Mechanism