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純鎢等通道雙拐角擠壓的變形行為分析
作者:
作者單位:

合肥工業(yè)大學(xué)材料與科學(xué)工程學(xué)院

作者簡(jiǎn)介:

通訊作者:

中圖分類(lèi)號(hào):

TG376

基金項(xiàng)目:

非致密鎢閉塞式背壓變通道轉(zhuǎn)角雙向鐓擠非平衡晶界形成及其對(duì)脆性的影響機(jī)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:

    基于等通道角擠壓（ECAP）技術(shù)，開(kāi)發(fā)了等通道雙拐角擠壓（ECDAP）技術(shù)，它是一種新的大塑性變形（SPD）工藝，可以改善沖頭的偏載現(xiàn)象。通過(guò)有限元模擬和實(shí)驗(yàn)研究，定量分析了工業(yè)燒結(jié)態(tài)純鎢在單道次ECDAP過(guò)程中的變形行為。結(jié)果表明，在相同的參數(shù)下，ECDAP模具的應(yīng)力分布較ECAP均勻，沖頭的偏載得到改善。同時(shí)，ECDAP引入的平均等效應(yīng)變與ECAP相近，但由于二次剪切變形，應(yīng)變分布的均勻性也得到了很大的改善。二次剪切變形區(qū)晶粒尺寸減小到1.77μm，而且拐角區(qū)晶粒明顯被拉長(zhǎng)。細(xì)晶強(qiáng)化和應(yīng)變強(qiáng)化也提高了試樣的顯微硬度。綜合分析，ECDAP工藝是制備超細(xì)晶粒金屬材料的一種有前途的方法。

    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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引用本文

李萍,段自豪,吳濤,華雅玲,薛克敏.純鎢等通道雙拐角擠壓的變形行為分析[J].稀有金屬材料與工程,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
  • 錄用日期:2020-02-20
  • 在線(xiàn)發(fā)布日期: 2020-10-15
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