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Journal of Advanced Manufacturing Technology, 2017, 88: 393-400. [15] NAROOEI K, KARIMI TAHERI A. Strain field and extrusion load in ECAE process of bi-metal circular cross section [J]. Applied... materials, respectively. The microhardness distribution in cross section of the ECAPed samples was measured with a Buehler (mxt-al model) microhardness tester equipped with a Vickers indenter under......
in the mechanical properties of this alloy was predictable due to the amount of plastic strain applied to the cross section. Fig. 12 SEM images for samples 4 Conclusions (1) Embedding two extrusion steps... is followed by an extrusion step in the outlet playing the role of additional back pressure. Therefore, more uniform and enhanced mechanical properties are expected in comparison with equal channel angular......
, 21-46. [9] 官林星, 朱合华, 于宁. 考虑荷载工况组合的盾构衬砌横向受力分析[J]. 岩土力学, 2004, 25(8): 1302-1306. GUAN Linxing, ZHU Hehua, YU Ning. Analysis of internal force of shield lining in cross-section considering load......
一种新型的锥形方管无模拉伸成形工艺夏鸿雁1,2,吴迪1,栾瑰馥2(1.辽宁省沈阳市东北大学轧制技术及连轧自动化国家重点实验室2.辽宁省沈阳市沈阳大学机械工程学院)摘 要:介绍了一种新型的锥形方管无模拉伸成形方法,该方法解决了锥形方管难于塑性成形的问题.通过对锥形方管无模拉伸变形机制的研究,建立了锥形方管无模拉伸的速度模型,制定了无模拉伸加工工艺,给出了主要工艺参数的确定方法.实验研究证明,所建立的速度模型较好地表达了无模拉伸速度变化规律,采用无模拉伸加工方法所获得的加工件,理论尺寸与实际尺寸相对误差小于7.6%......
to another chamber with equal dimensions. The inter-chamber can be considered an extrusion die having a smaller diameter [5]. During the final extrusion pass, the opposite ram is removed in order.... Since strain affects the microstructure produced in the material, the homogeneity of strain across the cross- section and longitudinal section of an extruded workpiece is of importance [8]. The strain......
distribution in the inhibition region. Thus, the lateral inhibition- intersecting cortical model was built up. With this modified model, gray level-average gray level histogram was used to turn the 1-D cross...; 文章编号:1672-7207(2013)05-1910-08 A strongly robust algorithm of image segmentation based on visual lateral inhibition ZHOU Li1, GAO Shan1, BI Duyan1, HE Linyuan1, SUN Yi2......
Dong-nan, YU Yang, NING Yu, MA Yu. FEM simulation of an Al-alloy profile with Non-symmetrical cross section during porthole extrusion[J]. Journal of Materials Engineering, 2013(3): 32-37. [8] 黄东男, 李有来... and grain size of original material 图5 不同挤压温度下焊合部位样品的EBSD晶粒形貌图 Fig. 5 EBSD images showing grain morphology of welding zone at different extrusion temperatures 图6 不同挤压温度下6005A铝合金的晶粒直径占......
alloys have an inhomogeneous ring on cross section, which consists of a fine-grain ring and a coarse-grain ring on the periphery. The width of the ring decreases with increasing the extrusion...轴晶组成,平均晶粒尺寸见表1.从总体来看,随着挤压温度的提高,晶粒尺寸随之增加.340 ℃挤压合金晶粒最小,平均晶粒尺寸约为8.2 μm.经往复挤压后,破碎的第二相颗粒仍呈网状分布,而且随着挤压温度的提高,均匀度并无明显改善. 图4 300 ℃往复挤压试样横截面组织演变 Fig. 4 Microstructural evolutions of cross section......
and provide accurate parameters for electron devices. Key words: K-shell; cross section; relativistic effect 原子的内壳层电子碰撞电离截面在许多方面有重要的应用,如电子探针显微分析(EPMA),俄歇电子谱仪(AES),电子能损谱仪(EELS)及聚变等离子体中杂质的诊断,都迫切需要精确的有关电子致原子... A, 1965, 138(2): 336-358. [16] Hombourber C. An empirical expression for K-shell ionization cross section by electron Impact[J]. J Phys B, 1998, 31(10): 3693-3702. (编辑 赵俊) 收稿日期:2010-01-03；修回日期:2010-04-15......
析 中图分类号:TG 376 文献标识码:A Effect of back pressure on equal channel angular extrusion process of powder porous material ZHOU Ming-zhi1, LI Ping2, XUE Ke-min2 (1. No.38...: The densification and deformation behavior of powder porous material during the equal channel angular extrusion (ECAE) process with back pressure were investigated by compressible rigid-viscoplasticity finite......
