+高级检索
热轧温度对Ti-6AL-4V合金组织及动态力学性能的影响研究
DOI:
作者:
作者单位:

北京理工大学 材料学院,北京理工大学材料学院,北京理工大学材料学院,北京理工大学材料学院

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)


Effect of hot-rolling temperature on microstructure and dynamic mechanical properties of Ti–6Al–4V
Author:
Affiliation:

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:

    在840℃,870℃, 900℃和930℃条件下分别对等轴Ti-6AL-4V合金进行总变形量为78%的热轧,随后对热轧Ti-6AL-4V合金的显微组织形貌、织构及动态力学性能进行研究。结果表明,(1)当热轧温度达到900℃以上时,TI-6AL-4V合金中才发生再结晶及相变,显微组织类型由等轴组织变为双态组织,αs+β组织及再结晶等轴α晶粒的含量随热轧温度升高而增加。(2)热轧Ti-6AL-4V合金中的织构随热轧温度变化而改变,但α晶粒的<0001>方向始终平行于轧板的法向。(3)热轧Ti-6AL-4V合金的动态力学性能具有明显的各向异性,且各向异性规律随热轧温度的变化而改变。(4)随着热轧温度的升高,沿法向加载时,合金的动态流变应力不断减小,绝热剪切临界失效应变不断增大;沿轧向加载时,合金的动态流变应力基本保持不变,但临界失效应变明显降低;沿横向加载时,合金的动态力学性能在840℃到900℃的热轧温度范围内基本保持不变,但当热轧温度为930℃时,合金的动态流变应力明显升高,临界失效应变明显降低。

    Abstract:

    The equiaxed Ti-6Al-4V alloys were rolled with an overall reduction ratio of 0.78 at 840℃, 870℃, 900℃ and 930℃, respectively. The microstructure, texture and anisotropy of dynamic mechanical properties of the rolled alloy were investigated. Results have shown that, recrystallization and phase transformation did not occur until the rolling was performed at a temperature higher than 900℃, and then the microstructure of the rolled alloy turned into bimodal, while the amount of lamellar αs+β structure and recrystallized α grains showed an increasing tendency with the increased rolling temperature. Moreover, it was interesting to find that although the texture was varying with the rolling temperature, the <0001> direction of α phase kept parallel to the normal direction (ND) during the hot-rolling process at various temperatures. Based on the analyses of dynamic mechanical properties, Ti-6Al-4V alloy was observed to exhibit anisotropy of dynamic mechanical properties after hot-rolling at different temperature. However, resulting from the rolling-temperature-depended texture and distribution of dislocation, the anisotropic tendency of dynamic mechanical properties varied with the rolling temperature. Moreover, with the increased rolling temperature, the dynamic flow stress loaded along ND decreased, while the adiabatic shearing failure strain slightly increased. The dynamic flow stress loaded along RD remained constant, while the adiabatic shearing failure strain exhibited an obviously decreasing tendency with the increased rolling temperature. The dynamic mechanical properties loaded along Transverse Direction (TD) remained constant when the rolling temperature was in the range of 840℃ to 900℃, while the dynamic flow stress loaded along TD increased evidently when the rolling temperature reaches 930℃, but the adiabatic shearing failure strain decreased greatly.

    参考文献
    相似文献
    引证文献
引用本文

骆雨萌,刘金旭,李树奎,程兴旺.热轧温度对Ti-6AL-4V合金组织及动态力学性能的影响研究[J].稀有金属材料与工程,2018,47(5):1333~1340.[Luo Yumeng, Liu Jinxu, Li Shukui, Cheng Xingwang. Effect of hot-rolling temperature on microstructure and dynamic mechanical properties of Ti–6Al–4V[J]. Rare Metal Materials and Engineering,2018,47(5):1333~1340.]
DOI:[doi]

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:2016-01-30
  • 最后修改日期:2016-06-01
  • 录用日期:2017-04-13
  • 在线发布日期: 2018-06-08
  • 出版日期: