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激光立体成形Ti-xV-15Cr (x = 20,25,30,35)合金的组织和阻燃性能
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1.长安大学 材料科学与工程学院;2.西北工业大学 凝固技术国家重点实验室

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国家重点研发计划(2016YFB1100103),陕西省自然科学基础研究计划(2020JM-239),中央高校基本科研业务费项目 (300102319208, 300102310501),大学生创新创业训练项目 (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:

    本文详细介绍了使用直接能量沉积技术,以纯Ti,纯V和纯Cr粉末为原料制备一系列Ti-xV-15Cr(x = 20,25,30,35)合金。研究了V含量对Ti-xV-15Cr合金的晶粒形貌、显微硬度、弹性模量及阻燃性能的影响。结果表明,Ti-20V-15Cr、Ti-25V-15Cr和Ti-30V-15Cr合金的显微组织由外延生长的柱状晶和顶部细小的等轴晶组成,随着V含量的增加柱状晶粒的长宽比逐渐减小。而Ti-35V-15Cr合金的显微组织与Ti-20V-15Cr,Ti-25V-15Cr和Ti-30V-15Cr有很大的不同,除了顶部是细小的等轴晶,几乎全由近等轴晶组成。结合柱状晶向等轴晶转变(CET)模型以及柱状晶层的高度与Z轴抬升量(ΔZ)之间的关系,解释了微观组织的形成机理。Ti-xV-15Cr合金的平均显微硬度随V含量的增加而略有增加,其弹性模量在123.8 GPa到137.6 GPa之间。阻燃测试表明,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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张凤英,王刚,刘桐,王坤,康晨诺,彭艺杰,李尧,谭华,陈永楠.激光立体成形Ti-xV-15Cr (x = 20,25,30,35)合金的组织和阻燃性能[J].稀有金属材料与工程,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
  • 录用日期:2020-07-21
  • 在线发布日期: 2021-03-09
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