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Ti-1500合金紧固件热镦成形及微观组织研究
作者:
作者单位:

1.东北大学 材料科学与工程学院;2.西北有色金属研究院

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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)


Study on Hot Upsetting and Microstructure of Ti-1500 Alloy Fastener
Author:
Affiliation:

1.School of Materials Science and Engineering, Northeastern University;2.Northwest Institute for Nonferrous Metal Research

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    通过对Ti-1500合金进行热镦成形实验,对比分析了不同热镦温度下三个不同变形区的显微组织。实验结果表明:热镦工艺对微观组织演化有显著影响,热镦温度越高且变形量越大的区域动态再结晶越明显。具体表现为700 ℃时变形Ⅰ区和变形Ⅱ区未发生动态再结晶,变形Ⅲ区发生了明显的再结晶,820 ℃时发生了α→β相变且3个变形区均发生明显的动态再结晶,900 ℃时再结晶晶粒过度长大。700 ℃镦制时变形Ⅰ区形成了{001}//ND织构,随着变形量增大,变形Ⅱ区的晶粒逐渐向<001>和<111>方向转动,最终形成了强度更高且体积分数更多的{001}织构并形成了一部分{111}//ND织构,当变形量增至变形Ⅲ区时,再结晶形成了<001>取向的新晶粒,晶粒长大过程中<001>取向晶粒的晶界向<111>取向晶粒的晶界迁移,导致{001}织构强度和体积分数进一步增加,而{111}织构体积分数有所下降,并且820 ℃和900 ℃时的织构类型、织构强度以及织构演化规律与700 ℃时是一致的。

    Abstract:

    The microstructure of Ti-1500 alloy in three different deformation zones at different hot upsetting temperatures was comparatively analyzed through hot upsetting experiments. The experimental results show that the hot upsetting process has a significant influence on the microstructure evolution, and the higher the hot upsetting temperature and the larger the deformation, the more obvious the regional dynamic recrystallization is. Specifically, dynamic recrystallization did not occur in deformation zone I and deformation zone II at 700 ℃, but obvious recrystallization occurred in deformation zone III, α→β phase transformation occurred at 820 ℃ and obvious dynamic recrystallization occurred in all three deformation zones, and the recrystallized grains grew excessively at 900 ℃. When upsetting at 700 ℃, the {001}//ND texture was formed in the deformation zone I. With the increase of deformation, the grains in the deformation zone II gradually turned in the directions of <001> and <111>, and finally the {001} texture with higher strength and more volume fraction was formed and a part of the {111}//ND texture was formed. When the deformation amount increased to the deformation zone III, During grain growth, the grain boundaries of <001> oriented grains migrate to those of <111> oriented grains, which leads to the further increase of {001} texture strength and volume fraction, while the volume fraction of {111} texture decreases, and the texture type, texture strength and texture evolution law at 820 ℃ and 900 ℃ are consistent with those at 700 ℃.

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宁昭勇,辛社伟,周 伟,王 晓. Ti-1500合金紧固件热镦成形及微观组织研究[J].稀有金属材料与工程,,().[Ning Zhaoyong, Xin Shewei, zhou wei, Wang Xiao. Study on Hot Upsetting and Microstructure of Ti-1500 Alloy Fastener[J]. Rare Metal Materials and Engineering,,().]
DOI:10.12442/j. issn.1002-185X.20230828

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  • 收稿日期:2023-12-22
  • 最后修改日期:2024-03-05
  • 录用日期:2024-03-11
  • 在线发布日期: 2024-03-22
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