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ECAP對SLM純鈦組織演變和力學(xué)性能影響
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作者單位:

1.西安建筑科技大學(xué) 冶金工程學(xué)院，陜西 西安 710055;2.冶金技術(shù)國家級實(shí)驗(yàn)教學(xué)示范中心，陜西 西安 710055;3.功能材料加工國家地方聯(lián)合工程研究中心，陜西 西安 710055

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中圖分類號:

TG37

基金項(xiàng)目:

國家自然科學(xué)基金項(xiàng)目（51474170）；陜西省教育廳專項(xiàng)基金（19JK0468)


Microstructure Evolution and Mechanical Properties of SLM Pure Titanium by ECAP
Author:
Affiliation:

1.School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;2.National Experimental Teaching Demonstration Center of Metallurgical Technology, Xi'an 710055, China;3.National and Local Joint Engineering Research Center for Functional Material Processing, Xi 'an 710055, China

Fund Project:

National Natural Science Foundation of China (51474170); Special Fund of Shaanxi Provincial Department of Education (19JK0468)

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    摘要:

    等通道轉(zhuǎn)角擠壓（equal channel angular pressing，ECAP）成功對選擇激光熔化（selective laser melting， SLM）制備的純鈦進(jìn)行了改性處理。采用兩通道夾角Φ=120°，ψ=20°的模具，在室溫下對SLM制備的純鈦進(jìn)行單道次變形改性處理，并對其顯微組織和力學(xué)性能進(jìn)行了評價。結(jié)果表明：SLM+ECAP純鈦試樣組織細(xì)化，晶粒尺寸由13 μm減小到7 μm，位錯密度增加。ECAP變形過程中，孿生和連續(xù)動態(tài)再結(jié)晶同時存在，拉伸與壓縮孿晶的出現(xiàn)和位錯密度的增加共同促使SLM+ECAP純鈦試樣顯微硬度增加了13%，屈服強(qiáng)度和極限抗拉強(qiáng)度分別提高了18%和20.4%，而延伸率略有減小。

    Abstract:

    The pure titanium prepared by selective laser melting (SLM) was modified by equal channel angular pressing (ECAP). The pure titanium prepared by SLM was subjected to single-pass deformation modification at room temperature by a die with the angle of Φ=120° and ψ=20° between two channels, and its microstructure and mechanical properties were evaluated. The results show that the microstructure of SLM+ECAP pure Ti sample is refined, the grain size decreases from 13 μm to 7 μm, and the dislocation density increases. During the ECAP deformation process, twinning and continuous dynamic recrystallization (CDRX) occur simultaneously. The appearance of tensile and compression twin and the increase of dislocation density together promote the microhardness of SLM+ECAP pure Ti samples, increased by 13%, and YS and UTS are increased by 18% and 20.4% respectively, while the elongation decreases slightly.

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引用本文

羅雷,段西明,楊西榮,劉曉燕,王文,韓鵬.ECAP對SLM純鈦組織演變和力學(xué)性能影響[J].稀有金屬材料與工程,2022,51(6):1964~1971.[Luo Lei, Duan Ximing, Yang Xirong, Liu Xiaoyan, Wang Wen, Han Peng. Microstructure Evolution and Mechanical Properties of SLM Pure Titanium by ECAP[J]. Rare Metal Materials and Engineering,2022,51(6):1964~1971.]
DOI：10.12442/j. issn.1002-185X.20210311

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歷史
  • 收稿日期:2021-04-10
  • 最后修改日期:2021-05-19
  • 錄用日期:2021-06-21
  • 在線發(fā)布日期: 2022-06-29
  • 出版日期: 2022-06-29