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利用選區(qū)激光熔化技術制備梯度結構的Ti-6Al-4V合金
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1.中南大學 粉末冶金研究院，湖南 長沙 410083;2.中南大學 粉末冶金國家重點實驗室，湖南 長沙 410083;3.中南大學 湘雅醫(yī)院 骨科，湖南 長沙 410083

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基金項目:

the Key-Area Research and Development Program of Guangdong Province, China (No. 2019B010943001), the Natural Science Foundation of Hunan Province, China (No. 2018JJ3654) and the fund of State Key Laboratory of Powder Metallurgy, Central South University.


Additive Manufactured Ti-6Al-4V Alloy with Graded Micro-structure by Selective Laser Melting
Author:
Affiliation:

1.Powder Metallurgy Research Institute, Central South University, Changsha 410083, China;2.State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;3.Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha 410083, China

Fund Project:

National Key R&D Program of China (2018YFB0704100); Key-Area Research and Development Program of Guangdong Province (2019B010943001); Natural Science Foundation of Hunan Province (2018JJ3654); Fund of State Key Laboratory of Powder Metallurgy, Central South University; International Exchange Program of China Postdoctoral Science Foundation

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    摘要:

    采用選區(qū)激光熔化技術（SLM）制備了梯度Ti-6Al-4V合金。隨著樣品沉積厚度的逐漸增加，控制激光功率或掃描速率逐步升高或降低，以此研究了梯度結構Ti-6Al-4V合金的相變及結構演變。結果表明：由于選取激光熔化過程中的高冷卻速率，SLM制備的Ti-6Al-4V合金的主要組織結構為初始β柱狀晶里的針狀馬氏體。β柱狀晶會隨著激光功率的增加或掃描速率的降低而增寬。激光功率和掃描速率的變化會引起馬氏體擇優(yōu)取向的變動。最后，由于局部不同的能量變化，隨樣品沉積厚度增加而逐步升高或降低的掃描速率會引發(fā)2種不同的空洞缺陷。

    Abstract:

    Graded Ti-6Al-4V alloys were produced by selective laser melting (SLM). Regulation of laser power and scanning speed was applied separately on each sample along the building direction. The microstructure transformation and phase transition in the graded Ti-6Al-4V were investigated. Results show that due to the rapid cooling rate of the SLM process, the microstructure of Ti-6Al-4V is mainly acicular α′ martensite in prior β column grains. The β column grains are enlarged with the increase of laser power or the decrease of scanning speed. The preferential orientation of α′ grains changes due to the variation of laser power and scanning speed. Moreover, the ascending scanning speed or descending scanning speed during the process may lead to two different defects.

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劉世超,雷鵬飛,劉敏,張耕銘,陳超,周科朝.利用選區(qū)激光熔化技術制備梯度結構的Ti-6Al-4V合金[J].稀有金屬材料與工程,2021,50(10):3543~3549.[Liu Shichao, Lei Pengfei, Liu Min, Zhang Gengming, Chen Chao, Zhou Kechao. Additive Manufactured Ti-6Al-4V Alloy with Graded Micro-structure by Selective Laser Melting[J]. Rare Metal Materials and Engineering,2021,50(10):3543~3549.]
DOI：10.12442/j. issn.1002-185X.20200587

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歷史
  • 收稿日期:2020-08-11
  • 最后修改日期:2020-10-17
  • 錄用日期:2020-12-14
  • 在線發(fā)布日期: 2021-10-28
  • 出版日期: 2021-10-25