近<i>α</i>型Ti70合金的吸氢行为研究

doi:10.11902/1005.4537.2020.143

中国腐蚀与防护学报

2021, Vol. 41

Issue (4): 549-554 DOI: 10.11902/1005.4537.2020.143

研究报告

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近α型Ti70合金的吸氢行为研究

王佳¹, 刘晓勇¹(

), 高灵清¹^,², 查小琴¹^,², 罗先甫¹, 张文利¹, 张恒坤¹

^1.中国船舶重工集团公司第七二五研究所洛阳 471023
^2.河南省船舶及海工装备结构材料技术与应用重点实验室洛阳 471023

Hydrogen Absorption Behavior of Near α Ti70 Alloy

WANG Jia¹, LIU Xiaoyong¹(

), GAO Lingqing¹^,², ZHA Xiaoqin¹^,², LUO Xianfu¹, ZHANG Wenli¹, ZHANG Hengkun¹

^1.Luoyang Ship Material Research Institute, Luoyang 471023, China
^2.Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipments, Luoyang 471023, China

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摘要:

采用电解充氢的方法对Ti70合金试样充氢，并用气体分析仪和金相显微镜 (OM) 对其氢含量和显微组织进行表征，以探究微观组织、扩散方向以及比表面积对吸氢行为的影响。结果表明：Ti70合金的吸氢能力随β相的连续程度增大而升高，原因在于具有bcc结构的β相提供了更多的四面体间隙，成为H更易扩散的通道；进入试样的H在宏观上呈非均匀分布，含量由试样表面向心部迅速降低，且H沿轧制方向的扩散能力明显大于板厚方向，这是由于沿板厚方向扩散时，拉长的α晶粒成为氢扩散的阻力，而在轧制方向狭长的连续β相更利于H的渗入；随试样比表面积增大，吸H量显著上升，进一步表明H沿表面吸入后难以充分向内扩散，导致单位体积对应的表面积越大吸氢能力越强。

关键词 ： Ti70合金, 显微组织, 扩散方向, 比表面积, 吸氢能力

Abstract：

The hydrogen absorption behavior of Ti70 alloy was studied by electrolytic hydrogen charging and then characterized via hydrogen analyzer and metallographic microscope. The relationship between the hydrogen content with the microstructure, diffusion direction and specific surface area of Ti70 alloy was examined. The results show that the increased continuity of β phase strongly facilitates the absorption capacity of Ti70 alloy, whereas, the β phase provides more tetrahedral interstitial sites, becoming the easier diffusion path for H. The distribution of H in the alloy is macroscopically non-uniform. The H content shows a sharp decreasing from the surface to the interior. The diffusion of H along the thickness direction is much more difficult than the rolling direction. This should be attributed to the blocking effects caused by the elongated α phase in the thickness direction and the more continuous β phase along the rolling direction. The H absorption capacity was found to increase with the specific surface area of the alloy sample, which further proved that the absorbed H is not sufficiently diffused in the alloy sample, as a result, the larger the surface area per unit volume, the higher the H absorption capacity.

Key words： Ti70 alloy microstructure diffusion direction specific surface area hydrogen absorption capacity

收稿日期: 2020-08-04

ZTFLH:

TG146

通讯作者: 刘晓勇 E-mail: liuxiaoyong@alumni.sjtu.edu.cn

Corresponding author: LIU Xiaoyong E-mail: liuxiaoyong@alumni.sjtu.edu.cn

作者简介: 王佳，女，1995年生，硕士生

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引用本文:

王佳, 刘晓勇, 高灵清, 查小琴, 罗先甫, 张文利, 张恒坤. 近α型Ti70合金的吸氢行为研究[J]. 中国腐蚀与防护学报, 2021, 41(4): 549-554.
Jia WANG, Xiaoyong LIU, Lingqing GAO, Xiaoqin ZHA, Xianfu LUO, Wenli ZHANG, Hengkun ZHANG. Hydrogen Absorption Behavior of Near α Ti70 Alloy. Journal of Chinese Society for Corrosion and protection, 2021, 41(4): 549-554.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.143 或 https://www.jcscp.org/CN/Y2021/V41/I4/549

图1 不同温度退火后的试样金相组织

表1 充氢前后不同组织Ti70试样的氢含量 (μg/g)

图2 不同位点处氢含量变化示意图

表2 不同位点处试样的氢含量 (μg/g)

图3 氢含量随比表面积变化

表3 氢在Ti中的扩散系数[13]

图4 四面体间隙在密排六方结构中的分布图及氢原子在体心立方结构中的扩散路径示意图

图5 Ti70合金试样的微观组织示意图

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