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Microstructure and Flame-resistant Properties of Ti-xV-15Cr (x = 20,25,30,35) Alloys by Laser Solid Forming
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1.School of Materials Science and Engineering,Chang’an University,Xi’an;2.State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an

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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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    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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[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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History
  • Received:June 28,2020
  • Revised:November 24,2020
  • Adopted:July 21,2020
  • Online: March 09,2021
  • Published: