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沙坪坝,401331； 4. 陆军勤务学院 化学与材料学院,重庆 沙坪坝,401311) 摘 要: 为了促进镁合金的大塑性变形技术的工业化,本文研究了一种正挤压与等通道挤压相结合的镁合金薄壁管材(Tube)挤压(Extrusion)－剪切(Shearing)－弯曲(Bending)(简写为TESB)连续塑性成形方法；采用有限元法对TESB变形过程进行计算机数值模拟；研究结果发现:随着挤...道挤压相结合的镁合金薄壁管材(Tube)挤压(Extrusion)-剪切(Shearing)-弯曲(Bending)(简写TESB)成形方法,提出的TESB工艺是在现有的SPD工艺基础上特别是ECAP工艺改进后而设计的新工艺.本文利用DEFORM-3D 弹塑性有限元分析模拟软件, 进行TESB成形过程模拟, 设计并制造出立式挤压机上使用的模具,并进行了试验验证,对镁合金TESB变形后的微观组织演化......
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; turbine ring part superalloy GH2035A; turbine blade superalloy DZ417G; superheater tube superalloy GH2984; hot corrosion resistant superalloy; K444; K435; K452; GH4413 高温合金具有良好的高温强度和抗氧化抗腐蚀性能,优异的抗疲劳和抗蠕变性能...高温合金的化学成分[16] Table 9 Chemical compositions of superalloys used for superheater tube[16] (mass fraction, %) 表10 几种过热器管材用高温合金的力学性能[16] Table 10 Mechanical properties of some......
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process of CT20 titanium alloy tubes used for spaceflight engine tube to carry liquid hydrogen is complex. Numerical control bending tube machine was used to bend the tubes of different original... bending tube machine. Key words: CT20 titanium alloy; tube; microstructure; cold bending 钛及钛合金具有密度小,比强度高等优异综合性能,被广泛应用于航空航天等领域[1].CT20钛合金(Ti-Al-Zr-Mo系)是西北有色金属研究院研制开发的一种近α型低温钛合金,室温拉伸强度≥600 MPa,伸长率≥16......
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-liquid two-phase flow model was set up and an emulation research of the sprayed phenomenon inside the cone tube was carried out. Turbulent intensity, pressure and velocity along with the flow direction were investigated. The results show that turbulence phenomenon of the spray flow field is stronger at 20 mm of the cone tube, and it is gradually stable and thereafter flow in field, where the flow......
-DYNA. Geometry of these tubes was then optimized by decreasing the cross section dimensions at the distal end while the weight remained unchanged. Octagonal conical tube was finally found to be more... method called TOPSIS was finally implemented on the numerical results to select the most efficient energy absorber. Key words: crashworthiness; dynamic axial and oblique load; double-cell conical tube......
材；连续流变扩展成形；时效；性能 中图分类号:TG 111.4; TG 244.1 文献标识码: A Continuous extending rheo-extrusion process for producing 6201 alloy tube GUAN Ren-guo, LI Xue, LI Jiang-ping... for producing 6201 alloy tube was investigated by using a self-designed setup. The results show that 6201 alloy tube with good performance can be successfully manufactured by the proposed technique. The optimal......
proportional assessment (COPRAS) method was then employed to select the most efficient tube using two conflicting criteria, namely peak collapse force (PCF) and energy absorption (EA). From the COPRAS calculations, the multi-cell conical tube with decagonal cross-section (MCDT) showed the best crashworthiness performance. Furthermore, the effects of possible number of inside ribs on the crashworthiness......
