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纯钨等通道双拐角挤压的变形行为分析
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合肥工业大学材料与科学工程学院

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中图分类号:

TG376

基金项目:

非致密钨闭塞式背压变通道转角双向镦挤非平衡晶界形成及其对脆性的影响机理研究(51675154)。


Deformation Behaviors of Pure Tungsten during Equal Channel Double Angular Pressing
Author:
Affiliation:

1.School of Materials Science and Engineering,Hefei University of Technology;2.Tunxi Road,Hefei;3.Institute of Industry and Equipment Technology,Hefei University of Technology

Fund Project:

Study on mechanisms of non-equilibrium grain boundary forming and effects on brittleness of porous tungsten deformed by blocking varietal channel angular bi-directional upsetting-extruding with back pressure(51675154).

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    摘要:

    基于等通道角挤压(ECAP)技术,开发了等通道双拐角挤压(ECDAP)技术,它是一种新的大塑性变形(SPD)工艺,可以改善冲头的偏载现象。通过有限元模拟和实验研究,定量分析了工业烧结态纯钨在单道次ECDAP过程中的变形行为。结果表明,在相同的参数下,ECDAP模具的应力分布较ECAP均匀,冲头的偏载得到改善。同时,ECDAP引入的平均等效应变与ECAP相近,但由于二次剪切变形,应变分布的均匀性也得到了很大的改善。二次剪切变形区晶粒尺寸减小到1.77μm,而且拐角区晶粒明显被拉长。细晶强化和应变强化也提高了试样的显微硬度。综合分析,ECDAP工艺是制备超细晶粒金属材料的一种有前途的方法。

    Abstract:

    As a new severe plastic deformation (SPD) method, equal-channel double angular pressing (ECDAP) is developed based on equal-channel angular pressing (ECAP) to reduce the offset load. The deformation behaviors of commercial sintered pure tungsten (W) during single pass ECDAP were analyzed quantitatively in this paper by means of finite element simulation and experiment investigation. The results show that, compared with ECAP, the local force of the die distributes more homogeneously and the offset load of the punch is improved with the same parameters. Meanwhile, the average effective strain introduced by ECDAP is similar to that of ECAP. Nevertheless, the uniformity of strain distribution is also greatly improved owing to the secondary shear deformation. In addition, grain size decreases to 1.77 μm in the secondary shear deformation zone and the grains are elongated obviously in the angle zone. Hence, the microhardness was enhanced because of the Hall-Petch strengthening and strain strengthening. These results indicate that the ECDAP process is a promising approach for producing ultra-fine grains metallic materials.

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李萍,段自豪,吴涛,华雅玲,薛克敏.纯钨等通道双拐角挤压的变形行为分析[J].稀有金属材料与工程,2020,49(9):3012~3020.[Ping Li, Zi-Hao Duan, Tao Wu, Ya-Ling Hua, Ke-Min Xue. Deformation Behaviors of Pure Tungsten during Equal Channel Double Angular Pressing[J]. Rare Metal Materials and Engineering,2020,49(9):3012~3020.]
DOI:10.12442/j. issn.1002-185X. E20190095

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  • 收稿日期:2019-07-31
  • 最后修改日期:2019-12-24
  • 录用日期:2020-02-20
  • 在线发布日期: 2020-10-15
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