温度对钛合金应力腐蚀行为的影响

doi:10.11902/1005.4537.2022.028

中国腐蚀与防护学报

2023, Vol. 43

Issue (1): 111-118 CSTR: 32134.14.1005.4537.2022.028 DOI: 10.11902/1005.4537.2022.028

研究报告

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温度对钛合金应力腐蚀行为的影响

李文桔¹^,², 张慧霞², 张宏泉¹(

), 郝福耀², 仝宏韬²

^1.武汉理工大学材料科学与工程学院武汉 430070
^2.中国船舶集团第七二五研究所海洋腐蚀与防护重点实验室青岛 266237

Effect of Temperature on Stress Corrosion Behavior of Ti-alloy Ti80 in Sea Water

LI Wenju¹^,², ZHANG Huixia², ZHANG Hongquan¹(

), HAO Fuyao², TONG Hongtao²

^1.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
^2.State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao 266237, China

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摘要:

通过在实验室控制海水温度模拟不同海域和季节海水环境。采用恒位移应力腐蚀实验和慢应变速率拉伸实验 (SSRT) 考察温度对Ti80钛合金应力腐蚀敏感性的影响规律，结合电化学阻抗谱、Mott-Schottky曲线以及三维视频显微镜和扫描电镜 (SEM) 分析温度对钛合金的影响机制。结果表明：在常压，5~35 ℃范围内，随着温度的降低，钛合金样品的应力腐蚀开裂敏感性指数逐渐增大，临界强度因子K_1SCC值逐渐减小，应力腐蚀倾向增加。低温海水环境下样品断口局部甚至出现河流花样特征和撕裂岭准解理特征。这是因为低温海水环境中钛合金样品裂纹尖端钝化膜电阻较小、缺陷较多、位错容易堆积从而导致钝化膜局部应力集中，膜致应力增大，与外加应力协同作用下，裂纹成核和扩展加快，导致钝化膜难以修复，应力腐蚀速率加快。

关键词 ：钛合金, 温度, 恒位移应力腐蚀, 慢应变速率拉伸, 钝化膜

Abstract：

In order to promote the application of Ti80 alloy for marine engineering, the influence of temperature variation on the stress corrosion behavior of the Ti-alloy was studied via constant displacement stress corrosion test and slow strain rate tensile test (SSRT), as well as electrochemical impedance spectroscopy, Mott-Schottky curve measurement, three-dimensional video microscopy and scanning electron microscopy (SEM). The results show that in atmospheric pressure and temperature range of 5-35 ℃, with the decrease of temperature, the stress corrosion cracking sensitivity index of Ti80 alloy gradually increases, the value of critical strength factor K_1SCC gradually decreases, and the stress corrosion tendency increases. In low-temperature seawater, the fractured surface of Ti80 alloy even presents characteristics of locally river-like and tearing ridge-like quasi-cleavage. This may be ascribed to that on the local area around the crack tip, the formed passivation film possesses small resistance, while there exists more defects, and easy stacking of dislocations, thus resulted in local stress concentration in the passivation film, further due to the synergy of the existed film stress and the applied stress, the crack nucleation and expansion may speed up, therewith damages on the passivation film may be hard repaired, and thus the stress corrosion rate may spontaneously be accelerated.

Key words： titanium temperature constant displacement stress corrosion slow stool rate stretch passive film

收稿日期: 2022-01-25 32134.14.1005.4537.2022.028

ZTFLH:

TG174

基金资助:国家自然科学基金(51931008)

作者简介: 李文桔，男，1996年生，硕士生

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引用本文:

李文桔, 张慧霞, 张宏泉, 郝福耀, 仝宏韬. 温度对钛合金应力腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2023, 43(1): 111-118.
Wenju LI, Huixia ZHANG, Hongquan ZHANG, Fuyao HAO, Hongtao TONG. Effect of Temperature on Stress Corrosion Behavior of Ti-alloy Ti80 in Sea Water. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 111-118.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.028 或 https://www.jcscp.org/CN/Y2023/V43/I1/111

图1 试样尺寸和取向图及慢应变速率拉伸样品形状及尺寸

图2 Ti80钛合金在大气和不同温度海水中的应力-应变曲线

图3 Ti80钛合金断面收缩率，断后伸长率以及损伤系数与温度的关系

图4 Ti80钛合金在不同条件下的宏观断口形貌

图5 Ti80钛合金样品在不同条件下的微观断口形貌

图6 Ti80钛合金恒位移样品宏观断口形貌

表1 Ti80钛合金样品应力腐蚀开裂数据

表2 不同温度下Ti80钛合金阻抗拟合分析结果

图7 Ti80钛合金样品恒位移实验后微观断口形貌

图8 Ti80钛合金在不同温度海水中的电化学阻抗谱及等效电路图

图9 Ti80钛合金Mott-schottky基曲线

图10 在不同温度海水中Ti80钛合金表面形成的钝化膜的Efb和Nd

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