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Microstructural evolution and mechanical properties of a Cr-rich β-solidifying TiAl-based alloy prepared by electromagnetic cold crucible continuous casting

机译:电磁冷坩埚连续铸造CR富β固化的基基合金的微观结构演化与力学性能

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摘要

In this work, the effect of pulling rates on the solidification structures and mechanical properties of a Cr-rich β-solidifying TiAl-based alloy prepared by electromagnetic cold crucible continuous casting was investigated. The solidification behaviors of non-equilibrium continuous casting Ti-45.5Al-4Cr-2.5Nb (in at.% unless otherwise specified) alloy at different pulling rates were discussed in detail. The continuous casting alloys were mainly composed of γ, B2 and α_2 three phases, and their microstructures consisted of lamellar structures matrix and some strip-shaped (B2+γ) coupled structures distributed therein. Both the macroscopic grain size and lamellar area width of the continuous casting alloys decreased first and then increased with the increase of pulling rate, and reached the minimum at the pulling rate of 1.5 mm/min; the former evolved under the combined effects of pulling rate and dendritic fragments, while the latter was not only affected by the pulling rate, but also closely related to the segregation of solute elements during non-equilibrium solidification. The volume fraction of B2 phase mainly depended on the Cr content of B2 phase itself, and decreased with the increase of Cr content. Under the comprehensive effects of solidification structures, the room-temperature tensile strength of the continuous casting alloys increased first and then decreased with the increase of pulling rate, and reached the maximum at the pulling rate of 1.5 mm/min, it was mainly related to the macroscopic grain size, the lamellar area width and the B2 phase content in addition to the interlamellar spacing.
机译:在这项工作中,研究了对通过电磁冷坩埚连续铸造制备的富含Cr富β固化的CR富β固化的凝固结构和机械性能的效果。详细讨论了非平衡连续浇铸Ti-45.5Al-2.5nb(除非另有说明)合金以不同拉伸率的非平衡连续铸造Ti-45.5Al-4cr-2.5nb的凝固性行为。连续铸造合金主要由γ,B2和α_2三相组成,并且它们的微结构由层状结构基质和分布在其中的一些条状(B2 +γ)耦合结构组成。连续铸造合金的宏观晶粒尺寸和层状区域宽度首先降低,然后随着拉伸速率的增加而增加,并以1.5mm / min的拉伸速率达到最小值;前者在拉伸速率和树突片段的综合作用下演变,而后者不仅受拉速度的影响,而且与在非平衡凝固过程中溶质元素的偏析密切相关。 B2相的体积分数主要取决于B2相本身的Cr含量,随着Cr含量的增加而降低。在凝固结构的综合效果下,连续铸造合金的室温拉伸强度首先增加,然后随着拉伸速率的增加而降低,并以1.5mm / min的拉速达到最大值,主要是相关的除了层间间距之外,宏观晶粒尺寸,层状宽度和B2相含量。

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  • 来源
    《Materials Science and Engineering》 |2020年第4期|140205.1-140205.14|共14页
  • 作者单位

    State Key Laboratory of Powder Metallurgy Powder Metallurgy Research Institute Central South University Changsha 410083 PR China National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and Engineering P. O. Box 434 Harbin Institute of Technology Harbin 150001 PR China;

    National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and Engineering P. O. Box 434 Harbin Institute of Technology Harbin 150001 PR China;

    National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and Engineering P. O. Box 434 Harbin Institute of Technology Harbin 150001 PR China;

    National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and Engineering P. O. Box 434 Harbin Institute of Technology Harbin 150001 PR China;

    National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and Engineering P. O. Box 434 Harbin Institute of Technology Harbin 150001 PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Titanium aluminide; Solidification structures; Micro-segregation; Mechanical properties;

    机译:铝化物;凝固结构;微偏析;机械性能;

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