+高级检索
连续冷却条件下Ti-1300合金的组织演变与连续转变图
作者:
作者单位:

1.贵州大学 材料与冶金学院;2.西北有色金属研究院

作者简介:

通讯作者:

中图分类号:

基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)


Microstructural Evolution and Continuous Cooling Transformation Diagram in Ti-1300 Alloy under Continuous Cooling Condition
Author:
Affiliation:

1.College of Materials and metallurgy,Guizhou University;2.Northwest Institute for Nonferrous Metal Research,Xi’an

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    通过OM、SEM、TEM和EBSD研究了Ti-1300合金在连续冷却条件下组织演变规律和亚稳β相的分解形式,并采用高精度膨胀法建立了合金的连续冷却转变动力曲线。结果表明:当连续冷却速度比较缓慢时,Ti-1300合金发生β → α + β转变,并获得集束状的显微组织;而当冷却速度0.3 °C/s <v< 1.5 °C/s时,Ti-1300合金发生β → α + β + βm,并获得细针状的α + β组织和残余的βm相;当冷却速度大于3 °C/s时,Ti-1300合金基本获得全部β相,所以把3 °C/s认为是合金的临界冷却转变速度。在缓慢冷却过程中,Mo当量梯度是合金中α相生长主要动力。随着冷却速度的增加,Ti-1300合金的显微硬度先增加后降低,在冷却速度为0.3 °C/s时,显微硬度达到最大值。

    Abstract:

    Microstructural evolution of Ti-1300 alloys was investigated using an optical microscopy, scanning electron microscopy, transmission electron microscopy and electron backscatter diffraction during continuous cooling. Then, a continuous cooling transformation diagram was established using dilatometric method, and the different kinds of β phase decomposition modes in the alloy under continuous cooling were investigated in detail. Moreover, the β → α + β phase transformation and colony structures are observed for low cooling rates. When the cooling rate is from 0.3 °C/s to 1.5 °C/s, the β → α + β + βm phase transformation and needle-like structures are observed in the alloy. However, when the cooling rate exceeds 3 °C/s, the alloy is only composed of a single metastable β phase. Thus, a rate of 3 °C/s is considered as critical cooling rate of the alloy under continuous cooling condition. The concentration gradient of molybdenum equivalent is considered as a driving force of α phase growth in the alloy.The microhardness of the alloy initially increases and then decreases with increasing of the cooling rate. When the cooling rate is 0.3 °C/s, the microhardness of the alloy reaches its maximum.

    参考文献
    相似文献
    引证文献
引用本文

万明攀,温鑫,马瑞,赵永庆.连续冷却条件下Ti-1300合金的组织演变与连续转变图[J].稀有金属材料与工程,2019,48(1):97~103.[MingPan Wan, Xin Wen, Rui Ma, YongQing Zhao. Microstructural Evolution and Continuous Cooling Transformation Diagram in Ti-1300 Alloy under Continuous Cooling Condition[J]. Rare Metal Materials and Engineering,2019,48(1):97~103.]
DOI:10.12442/j. issn.1002-185X.20170627

复制
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2017-07-18
  • 最后修改日期:2017-08-18
  • 录用日期:2017-10-12
  • 在线发布日期: 2019-02-18
  • 出版日期: