+高级检索
形变影响TC4钛合金组织演变的温度依赖特性研究
作者:
作者单位:

1.江苏省先进金属材料高技术研究重点实验室,东南大学材料科学与工程学院;2.江苏天工科技股份有限公司

作者简介:

通讯作者:

中图分类号:

TG146.4

基金项目:

国家自然科学基金资助(项目号51301038),镇江市重点研发计划资助(项目号GZ2017011)


Temperature-dependent effect of deformation on microstructure and properties of TC4 titanium alloy
Author:
Affiliation:

1.Jiangsu Key Laboratory of Advanced Metallic Materials,School of Materials Science and Engineering,Southeast University;2.Jiangsu Tiangong Technology Co,Ltd

Fund Project:

National Natural Science Foundation of China (No.51301038),Key R&D Program Funding of Zhengjiang(GZ2017011)

  • 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:

    本文采用等应变速率高温拉伸变形试验,研究了TC4钛合金在不同形变温度下微观组织和性能的演变行为,着重探讨了形变对钛合金组织演化、相变的影响作用及其随温度的变化规律。结果表明,α+β两相区变形,随形变温度升高,峰值应力及所需应变降低。形变对微观组织演化的影响作用随形变温度变化而改变:两相区中低温段(900℃以下),形变促进初生α相再结晶,细化初生α相尺寸;两相区高温段(900℃以上),形变促进次生α相球化,其作用随温度升高先增强后减弱。形变影响β→α相变进程,提高次生α相形核率,尤以两相区中低温段变形更为显著,从而使得片层状次生α相数量增加、间距明显细化。随形变温度升高,组织中α相总量先下降后上升,导致硬度先降低后升高,耐蚀性先升高后下降。其中900℃变形时,TC4钛合金α相总量最少(约57%),硬度略有降低而耐蚀性达到最优。

    Abstract:

    In this paper, the effect of deformation temperature on the evolution of microstructure and properties of TC4 alloy has been studied by a constant-strain rate tensile test at high temperature. The results show that both the peak stress and required strain of peak stress decrease with increasing temperature in a α+β dual-phase field. The deformed microstructure exhibits a strong temperature-dependent evolution with temperature. Deformation leads to an accelarated recrystallization and refinement of primary α phase at a lower temperature of α+β phase field (below 900 °C), whereas results in a significant spheroidization of secondary α phase at a higher temperature (above 900 °C). Additionally, deformation also affects the nucleation and growth process of β→α transformation, resulting in a larger amount of secondary α phase. With increasing deformation temperature, the volume fraction of α phase firstly decreases and then increases, which shows a good consistence with hardness. However, the corrosion resistance displays a reverse evolution with the amount of α phase. TC4 alloy exhibits a lowest volume fraction of α phase of 57% at a deformation temperature of 900 °C, which corresponds to a lowest hardness and a best corrosion resistance in a NaCl solution.

    参考文献
    相似文献
    引证文献
引用本文

李旭敏,方峰,蒋建清,周雪峰,候宇鑫.形变影响TC4钛合金组织演变的温度依赖特性研究[J].稀有金属材料与工程,2019,48(10):3379~3386.[Li Xumin, Fang Feng, Jiang Jianqing, Zhou Xuefeng, Hou Yuxin. Temperature-dependent effect of deformation on microstructure and properties of TC4 titanium alloy[J]. Rare Metal Materials and Engineering,2019,48(10):3379~3386.]
DOI:10.12442/j. issn.1002-185X.20180626

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:2018-06-14
  • 最后修改日期:2018-07-20
  • 录用日期:2018-08-30
  • 在线发布日期: 2019-11-01
  • 出版日期: