杜磊
物理测试
本文运用回归分析方法，讨论了Mn、Al、Fe、Ni四元素对ZCuAl8Mn14Fe3Ni2力学性能的影响。Al当量在10.2%～10.6%时，可以获得较好的强韧性，此时，Al含量应为7.8%～8.3%，相应的Mn含量约为13.7%～14.3%。铁配料成分应选择中限3.0%-3.6%，Ni取中上限2.0%-2.5%。
关键词:
高锰铝青铜
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regression analysis
,
casting
Zhenzhong CHEN
,
Ping HE
材料科学技术（英文）
Fatigue crack propagation (FCP) behaviors were studied to understand the role of SiC particles in 10 wt pct SiCp/A2024 composites and Si particles in casting aluminum alloy A356. The results show that a few particles appeared on the fracture surfaces in SiCp/Al composites even at high △K region, which indicates that cracks propagated predominantly within the matrix avoiding SiC particles due to the high strength of the particles and the strong particle/matrix interface. In casting aluminum alloy, Si particle debonding was more prominent. Compared with SiCp/Al composite, the casting aluminum alloy exhibited lower FCP rates, but had a slight steeper slope in the Paris region. Crack deflection and branching were found to be more remarkable in the casting aluminum alloy than that in the SiCp/Al composites, which may be contributed to higher FCP resistance in casting aluminum alloy.
关键词:
Aluminum-matrix composites
,
composites
,
casting
,
alloy
X.S. Zheng*
金属学报(英文版)
Mold is the heart of the continuous casting machine. Heat transfer and solidification in a water- cooled mold are the most important factors during the continuous casting of steel. For studying the temperature distribution of a mold wall, a simulated apparatus of mold was designed and experiments were performed by it. The measured results indicated that the mold wall temperature approaches the temperature of cooling-water. An equivalent thermal-conductivity coefficient was proposed and deduced on the basis of the conclusion of the experiments. This coefficient was applied to solve the heat transfer between the melt and cooling water, and to characterize the heat transfer capacity of the mold. By this equivalent thermal-conductivity coefficient, it is very easy and convenient to numerically simulate the solidification process of continuous casting. And the calculation results are in agreement with the experiments. The effects of casting speed and water flow rate on the mold temperature field were also discussed.
关键词:
continuous casting mold
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casting
,
mold
,
Temperature
,
fie
J.M. Zeng and Y.H. Zhou 1) Institute of Materials Science
,
Guangxi University
,
Nanning 530004
,
China 2) Department of Materials Science and Engineering
,
Shanghai Jiao Tong University
,
Shanghai 200030
,
China
金属学报(英文版)
In situ observations of the flow morphology during mold filling under counter gravity are conducted on a perspex water model by means of flow visualization, high speed photography and pattern processing. The experimental results indicate that influences of the dynamic factors on flow morphology can be expressed quantitatively with the parameterφ(k). The flow field takes on different morphology with change in values of φ(k). For thick and thin walled castings, the main dynamic factors influencing flow morphology are gravity and surface tension respectively. Under general circumstances, F_r and W_e should be equal in their values to guarantee the similarity between the prototype and the model in simulating mold filling under counter gravity by experiment.
关键词:
casting
,
null
,
null
J.M Zeng
,
H. Gu and YH. Zhou (Institute of Materials Science
,
Guangxi University
,
Nanning 530004
,
China Department of Materials Science and Engineering
,
Shanghai Jiaotong University
,
Shanghai 200030
,
China)
金属学报(英文版)
In this paper, the mathematical models for mould-filling under counteramvity are derived on the basis of the principle of momentum. Dynamic processes of mould-filling are observed on a perspex model by means of high speed photography. The results indicate that the mould-filling under counterpmvity can be described by the second oofer nonlinear dtherential equations charucterized by damping oscillations. The velocity oscillations amplofy as the pressuring speed increases if the pressure differential functions are of the same type. On the other hand, if the functions are of different type,then the velocity oscillations depend upon whether the functions pmpressively increase or decrease. Velocity oscillations can be diminished dmmatically by increasing the local damping within the gating system.
关键词:
casting
,
null
,
null
王清江
,
刘建荣
,
杨锐
航空材料学报
doi:10.11868/j.issn.1005-5053.2014.4.001
简要回顾国内外固溶强化型高温钛合金材料的发展历史,分析英、美、俄等国的高温钛合金研究与应用情况及发展趋势.介绍国内自主研制、使用温度在550～ 650℃范围内的三种钛合金新材料及其相关技术发展,对国内高温钛合金材料进行初步梳理.参考国外高温钛合金研究、应用经验及发展趋势,结合国内实际情况,对国内高温钛合金材料体系的建立及完善提出具体建议,并展望国内高温钛合金近期研究重点和未来发展方向.
关键词:
高温钛合金
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Ti55合金
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Ti60合金
,
Ti65合金
,
材料体系
,
焊接
,
铸造
,
保载疲劳
Y.W.Yan1)
,
B.K.Wei2)
,
Z.Y.Fu1)
,
H.T.Lin2) and R.Z.Yuan1) 1) State Key Lab .of Advanced Technologyfor Materials Synthesisand Processing
,
Wuhan University of Technol ogy
,
Wuhan 430070
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China 2) Institute of Materials
,
Huazhong University of Science and Technology
,
Wuhan 430074
,
China
金属学报(英文版)
Under aircondition,theinsitu TiCP/ Fecompositeshavebeen fabricated by a reactivecast ing route usingtheinexpensiveraw materials. The microstructuresofthecompositehavebeen studied by X ray diffraction,image analyzer and analyticalelectron microscopy. The me chanicalpropertiesand abrasive wearresistanceofboththeas castcompositeandthequenched composite havebeen measured. Theresultsshow thattheinsitu TiCparticles with a average sizeof 4 51μm exhibit a homogenous distribution inthe matrix, and an excellentinterface bonding between the particle and the matrix is achieved. As above microstructure features, thecomposite,especiallythequenched composite, hashigher mechanicalpropertiesand betterwear resistance,compared with high Cr whitecastiron.
关键词:
TiCP/ Fecomposite
,
null
,
null
,
null
,
null
F.BARTOLOMEU
,
M.BUCIUMEANU
,
E.PINTO
,
N.ALVES
,
F.S.SILVA
,
O.CARVALHO
,
G.MIRANDA
中国有色金属学报(英文版)
doi:10.1016/S1003-6326(17)60060-8
本研究的主要目的是研究加工工艺对Ti6Al4V生物医学合金显微组织、硬度和摩擦学行为(摩擦和磨损行为)的影响.加工工艺包括传统铸造、热压缩和选择激光熔化.采用X射线衍射技术、维氏硬度测试和Ti6Al4V/Al2O3摩擦副的往复式球板磨损实验对Ti6Al4V生物医学合金的冶金、力学和摩擦学性能进行表征.结果表面,加工工艺路线对合金的显微组织、硬度和磨损行为的影响很大.采用选择激光熔化工艺获得的Ti6Al4V合金具有最高的硬度和最佳的耐磨性能,这是由于与采用热压缩和传统铸造工艺相比,选择激光熔化工艺具有显著不同的冷却速率,这使得合金具有明显不同的显微组织.本研究评估和证明选择激光熔化工艺在制备高耐磨Ti6Al4V生物植入体方面具有较大潜力.
关键词:
生物医学合金
,
Ti6Al4V合金
,
磨损行为
,
显微组织
,
选择激光熔化
,
热压缩
,
铸造
J.X. Zhou
,
R.X. Liu
,
L.L. Chen
,
D.M. Liao
,
H.S. Wei
金属学报(英文版)
Numerical simulation of casting's mold filling process is the main and the most important aspect of the foundry CAE technology. But it is time-consuming; it may take dozens of hours or several days. While with the development of computer hardware, numerical simulation of casting's mold filling process has made rapid progress. The simulation results, therefore, have become more and more practical. This study tries to find some clues of the computational time of mold filling process. Firstly, this paper introduces mathematic model and the basic route of numerical simulation of casting's mold filling process. Then the computational time of mold filling process has been carefully studied, and some new and useful results have been gained from the study of the computational time. Finally, this paper has given some real applications of numerical simulation of casting's mold filling process.
关键词:
numerical simulation
,
null
,
null
