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首页> 外文期刊>Materials Science and Engineering >Obtaining bimodal microstructure in laser melting deposited Ti-5Al-5Mo-5V-1Cr-1Fe near β titanium alloy
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Obtaining bimodal microstructure in laser melting deposited Ti-5Al-5Mo-5V-1Cr-1Fe near β titanium alloy

机译：β钛合金附近激光熔敷沉积的Ti-5Al-5Mo-5V-1Cr-1Fe的双峰组织

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摘要

Bimodal microstructures, consist of equiaxed primary α (α_p) and lamellar secondary α (α_s), usually lead to good comprehensive properties for wrought titanium alloys. However, for laser melting deposited titanium alloys, only lamellar microstructures are usually obtained, which result in relative low ductility. In this paper, to improve the ductility of laser melting deposited Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy, we try to introduce equiaxed α and obtain bimodal microstructures by heat treatments. Firstly, two kinds of heat treatment are applied to obtain equiaxed α i.e., subtransus anneal treatment and subtransus multi-anneal treatment. The subtransus anneal treatment is found to be able to promote α phase globularization, and the underlying mechanism is proposed by diffusion theory. However, it only leads to the elongated α phase with aspect ratio about 3.5. Then, inspired by the globularization mechanism, a novel subtransus multi-anneal treatment is designed, which can lead to near equiaxed a with the aspect ratio about 1.7. Afterwards, the subtransus multi-anneal and aging treatment are applied to obtain bimodal microstructure with near equiaxed α_p and lamellar α_s, which increases the elongation of the alloy to 11.5％, compared to 6.7％ for the stress-relief anneal treated samples.
机译：由等轴初生α（α_p）和层状次生α（α_s）组成的双峰显微组织通常可为锻造钛合金带来良好的综合性能。然而，对于激光熔融沉积的钛合金，通常仅获得层状微结构，这导致相对低的延展性。为了提高激光熔敷沉积的Ti-5Al-5Mo-5V-1Cr-1Fe钛合金的延展性，我们尝试引入等轴α并通过热处理获得双峰组织。首先，采用两种热处理来获得等轴α，即，亚穿刺退火处理和亚穿刺多次退火处理。发现亚次退火处理能够促进α相球化，并通过扩散理论提出了潜在的机理。但是，它仅导致长宽比约为3.5的细长α相。然后，在球化机制的启发下，设计了一种新颖的亚穿刺多次退火处理方法，该处理可以导致纵横比约为1.7的近等轴a。然后，进行亚次退火和时效处理，以获得具有等轴α_p和层状α_s的双峰显微组织，这使合金的伸长率提高到了11.5％，而去应力退火处理后的样品为6.7％。

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  • 来源
    《Materials Science and Engineering》 |2014年第15期|177-184|共8页
  • 作者

    C.M. Liu; X.J. Tian; H.M. Wang; D. Liu;

  • 作者单位

    Laboratory of Laser Materials Processing and Manufacturing & Key Laboratory of Aerospace Materials of the Ministry of Education, Beihang University, Beijing 100191 China;

    Laboratory of Laser Materials Processing and Manufacturing & Key Laboratory of Aerospace Materials of the Ministry of Education, Beihang University, Beijing 100191 China;

    Laboratory of Laser Materials Processing and Manufacturing & Key Laboratory of Aerospace Materials of the Ministry of Education, Beihang University, Beijing 100191 China;

    Laboratory of Laser Materials Processing and Manufacturing & Key Laboratory of Aerospace Materials of the Ministry of Education, Beihang University, Beijing 100191 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Bimodal microstructure; Subtransus multi-anneal treatment; Laser melting deposition; Titanium alloy;

    机译：双峰微观结构;次Transus多退火处理;激光熔融沉积;钛合金;

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