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激光立體成形Ti-xV-15Cr (x = 20,25,30,35)合金的組織和阻燃性能
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作者單位:

1.長安大學 材料科學與工程學院;2.西北工業(yè)大學 凝固技術(shù)國家重點實驗室

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基金項目:

國家重點研發(fā)計劃(2016YFB1100103)，陜西省自然科學基礎研究計劃（2020JM-239），中央高校基本科研業(yè)務費項目 (300102319208, 300102310501)，大學生創(chuàng)新創(chuàng)業(yè)訓練項目 (201810710119)


Microstructure and Flame-resistant Properties of Ti-xV-15Cr (x = 20,25,30,35) Alloys by Laser Solid Forming
Author:
Affiliation:

1.School of Materials Science and Engineering,Chang’an University,Xi’an;2.State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an

Fund Project:

The National Key Research and Development Program of China (2016YFB1100103), Natural Science Basic Research Plan in Shaanxi Province of China (2020JM-239), Fundamental Research Funds for the Central Universities CHD (300102319208, 300102310501) and National Training Program of Innovation and Entrepreneurship for Undergraduates (201810710119)

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    摘要:

    本文詳細介紹了使用直接能量沉積技術(shù)，以純Ti，純V和純Cr粉末為原料制備一系列Ti-xV-15Cr（x = 20,25,30,35）合金。研究了V含量對Ti-xV-15Cr合金的晶粒形貌、顯微硬度、彈性模量及阻燃性能的影響。結(jié)果表明，Ti-20V-15Cr、Ti-25V-15Cr和Ti-30V-15Cr合金的顯微組織由外延生長的柱狀晶和頂部細小的等軸晶組成，隨著V含量的增加柱狀晶粒的長寬比逐漸減小。而Ti-35V-15Cr合金的顯微組織與Ti-20V-15Cr，Ti-25V-15Cr和Ti-30V-15Cr有很大的不同，除了頂部是細小的等軸晶，幾乎全由近等軸晶組成。結(jié)合柱狀晶向等軸晶轉(zhuǎn)變（CET）模型以及柱狀晶層的高度與Z軸抬升量(ΔZ)之間的關(guān)系，解釋了微觀組織的形成機理。Ti-xV-15Cr合金的平均顯微硬度隨V含量的增加而略有增加，其彈性模量在123.8 GPa到137.6 GPa之間。阻燃測試表明，Ti-35V-15Cr合金具有最佳的阻燃性能。

    Abstract:

    This paper details the production of a series of Ti-xV-15Cr (x=20,25,30,35) alloys by directed energy deposition (DED) technology, and pure Ti, pure V, and pure Cr powders were used as raw materials. The effects of V content on grain morphology, microhardness, elastic modulus and the flame-resistant properties of Ti-xV-15Cr alloys were determined. It was found that the microstructures of Ti-20V-15Cr, Ti-25V-15Cr and Ti-30V-15Cr alloys were composed of columnar grains growing epitaxially and fine equiaxed grains at the top region, with the aspect ratio of the columnar grains decreasing gradually with increasing V content. The microstructure of Ti-35V-15Cr alloy was composed of full near equiaxed grains except the very top region, which is very different from those of Ti-20V-15Cr, Ti-25V-15Cr and Ti-30V-15Cr alloys. The formation mechanism of microstructure was explained by combining the columnar to equiaxed transition (CET) model and the relationship between the height of the columnar grains layer and Z axis increment (ΔZ). The average microhardness of Ti-xV-15Cr alloys increases slightly with increasing V content, and the elastic modulus falls between 123.8 GPa to 137.6 GPa. Flame-resistant test showed that Ti-35V-15Cr alloy exhibits the best flame-resistant properties.

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張鳳英,王剛,劉桐,王坤,康晨諾,彭藝杰,李堯,譚華,陳永楠.激光立體成形Ti-xV-15Cr (x = 20,25,30,35)合金的組織和阻燃性能[J].稀有金屬材料與工程,2021,50(2):380~388.[Zhang Fengying, Wang Gang, Liu Tong, Wang Kun, Kang Chennuo, Peng Yijie, Li Yao, Tan Hua, Chen Yongnan. Microstructure and Flame-resistant Properties of Ti-xV-15Cr (x = 20,25,30,35) Alloys by Laser Solid Forming[J]. Rare Metal Materials and Engineering,2021,50(2):380~388.]
DOI：10.12442/j. issn.1002-185X.20200450

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  • 收稿日期:2020-06-28
  • 最后修改日期:2020-11-24
  • 錄用日期:2020-07-21
  • 在線發(fā)布日期: 2021-03-09
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