置氢改性钛合金扩散连接机理研究

成小乐 1; 2; 周思君 1; 符寒光 1; 赵冰 3; 白秉哲 3; 牛勇 2

doi:10.7652/xjtuxb201903016

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置氢改性钛合金扩散连接机理研究

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- 置氢改性钛合金扩散连接机理研究
- The Diffusion Bonding Mechanism of Hydrogenated Titanium Alloy
- 西安交通大学学报 2019年53卷第3期页码：111-116
- 作者机构：
  
  1. 西安工程大学机电工程学院,西安,710048
  2. 金属挤压与锻造装备技术国家重点实验室,西安,710032
- 作者简介：
- 基金信息：
  
  : 2018-09-17。作者简介: 成小乐(1976—),男,博士后,教授,硕士生导师。基金项目: 国家重点基础研究发展计划资助项目(2012CB724303);陕西省重点研发计划资助项目(2018GY-130);西安市科技计划资助项目(2017074CG/RC037(XAGC007));2018年度西安工程大学研究生创新基金资助项目(CHX201855)
- DOI：10.7652/xjtuxb201903016
  中图分类号： TB31
- 网络首发：2019-03-10，
  
  纸质出版：2019
- 稿件说明：
移动端阅览
成小乐 1, 2, 周思君 1, 等. 置氢改性钛合金扩散连接机理研究[J]. 西安交通大学学报, 2019,53(3):111-116.

The Diffusion Bonding Mechanism of Hydrogenated Titanium Alloy[J]. 2019, 53(3): 111-116.
成小乐 1, 2, 周思君 1, 等. 置氢改性钛合金扩散连接机理研究[J]. 西安交通大学学报, 2019,53(3):111-116. DOI： 10.7652/xjtuxb201903016.

The Diffusion Bonding Mechanism of Hydrogenated Titanium Alloy[J]. 2019, 53(3): 111-116. DOI： 10.7652/xjtuxb201903016.

摘要

利用置氢技术改善TC4钛合金的扩散连接性

优化扩散连接工艺参数。在Gleeble1500D热模拟机上

采用固态置氢技术进行了不同氢含量的置氢TC4钛合金的真空扩散连接试验; 采用扫描电镜对界面孔洞弥合率和界面组织形貌进行了分析。结果表明:由于氢的扩散系数大

可显著提高置氢TC4钛合金的扩散系数

降低α+β→β相转变温度

稳定合金中β相

促进晶界扩散

提高晶界活性

使材料热加工变形得到改善; 当置氢钛合金中氢的质量分数为0.25%、扩散连接温度为840 ℃、压力为15 MPa、保温时间为60 min时

界面结合良好

此时焊接区无扩散孔洞

钛合金基体组织仍为等轴α+β双相组织

且晶粒无明显长大。

Abstract

The diffusion bonding of TC4 titanium alloy was improved by using hydrogenation technology

and the diffusion bonding process parameters were optimized. Vacuum diffusion bonding experiments of hydrogenated TC4 titanium alloy with different hydrogen content were carried out on the Gleeble1500D thermal simulator using the solid-state hydrogenation technology. Scanning electron microscopy was used to analyze the interface void-filling rate and interface morphology. The results show that the diffusion coefficient of hydrogen can significantly increase the diffusion coefficient of the hydrogenated TC4 titanium alloy

lower the α+β→β transition temperature

stabilize the β phase in the alloy

and promote the diffusion of grain boundaries. The grain boundary activity was enhanced

thereby the material's hot working deformation was improved. When the hydrogen content of the hydrogenated titanium alloy was 0.25%

the diffusion bonding temperature was 840 ℃

the pressure was 15 MPa

and the holding time was 60 min

the interface was well bonded

where there was no diffusion holes in the weld zone

the titanium alloy matrix structure was still equiaxed α+β two-phase structure

and the crystal grains did not grow significantly.

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Keywords

references

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