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Effect of heat treatment on microstructure and mechanical properties of a new β high strength titanium alloy

机译：热处理对新型β高强度钛合金组织和力学性能的影响

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摘要

Microstructure and mechanical properties of a new β high strength Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe titanium alloy were investigated in this paper. Both the α/β and β solution treatment and subsequent aging at temperatures ranging from 440 ℃ to 560 ℃ for 8 h were introduced to investigate the relationship between microstructures and properties. Microstructure observation of α/β solution treatment plus aging condition shows that the grain size is only few microns due to the pinning effect of primary α phase. The β solution treatment leads to coarser β grain size and the least stable matrix. The size and volume fraction of secondary α are very sensitive to temperature and strongly affected the strength of the alloy. When solution treated at 775 ℃ plus aged at 440 ℃, the smallest size (0.028 μm in width) of secondary α and greatest volume fraction (61%) of α resulted in the highest yield strength (1624 MPa). And the yield strength decreased by an average of 103 MPa with every increase of 40 ℃ due to the increase of volume fraction and decrease of the size of secondary α. In β solution treatment plus aging condition, tensile results shows that the strength if the alloy dramatically decreased by an average of 143 MPa for every increase of 40 ℃ because of larger size of secondary α phase than α/β solution treated plus aged condition.
机译：研究了一种新型的β-高强度Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe钛合金的组织和力学性能。介绍了α/β和β固溶处理以及随后在440℃至560℃的温度下老化8小时的过程，以研究其微观结构与性能之间的关系。对α/β固溶处理和时效条件的显微组织观察表明，由于初级α相的钉扎效应，晶粒尺寸只有几微米。 β固溶处理会导致β晶粒变粗和基体最不稳定。次级α的尺寸和体积分数对温度非常敏感，并强烈影响合金的强度。当在775℃和440℃时效处理的溶液中，次生α的尺寸最小（宽度为0.028μm），α的体积分数最大（61％）导致了最高的屈服强度（1624 MPa）。随着体积分数的增加和次级α尺寸的减小，屈服强度平均每升高40℃，平均降低103 MPa。在β固溶处理和时效条件下，拉伸结果表明，如果二次α相的尺寸大于经α/β固溶处理和时效条件的合金，则每增加40℃，合金的强度就会平均下降143 MPa。

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  • 来源
    《Materials & design》 |2014年第3期|183-190|共8页
  • 作者

    Zhaoxin Du; Shulong Xiao; Lijuan Xu; Jing Tian; Fantao Kong; Yuyong Chen;

  • 作者单位

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Microstructure; Mechanical property; High strength titanium alloy; Heat treatment;

    机译：微观结构机械性能高强度钛合金;热处理;

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