模拟深水压力对低成本钛合金板管材应力腐蚀敏感性的影响

朱玉辉; 杨胜利; 党恒耀; 江恬恬; 高福洋; 刘千里; 吕逸帆

doi:10.7513/j.issn.1004-7638.2025.05.019

模拟深水压力对低成本钛合金板管材应力腐蚀敏感性的影响

doi: 10.7513/j.issn.1004-7638.2025.05.019

朱玉辉^1,,
杨胜利^{1, 2},
党恒耀¹,
江恬恬¹,
高福洋^{1, 2},
刘千里^{1, 2},
吕逸帆^{1, 2}

1.
中国船舶集团有限公司第七二五研究所, 河南洛阳 471023
2.
海洋腐蚀与防护全国重点实验室, 河南洛阳 471023

基金项目: 国家重点研发计划（2022YFB3705605）；国防基础科研计划资助（JCKY2023206A002）。

详细信息

作者简介:
朱玉辉，男，1993年生，博士，工程师，主要从事船用钛合金制备与应用研究， E-mail：yhzhu725@163.com.cn

中图分类号: TF044
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- 文章访问数: 35
- HTML全文浏览量: 13
- PDF下载量: 9
- 被引次数: 0
出版历程
- 收稿日期: 2025-03-03
- 录用日期: 2025-04-14
- 修回日期: 2025-03-31
- 刊出日期: 2025-10-30

Effect of hydrostatic pressure on stress corrosion susceptibility of low-cost titanium alloy plates and tubes

ZHU Yuhui^1
,,
YANG Shengli^{1, 2},
DANG Hengyao¹,
JIANG Tiantian¹,
GAO Fuyang^{1, 2},
LIU Qianli^{1, 2},
LÜ Yifan^{1, 2}

1.
Luoyang Ship Materials Research Institute, Luoyang 471023, Henan, China
2.
National Key Laboratory of Marine Corrosion and Protection, Luoyang 471023, Henan, China

摘要

摘要: 采用高压釜测试系统开展低成本Ti6411板材和Ti52管材及船用TC4 ELI和Ti80合金模拟深水环境压力（7.5 MPa）作用下的慢应变拉伸应力腐蚀试验，腐蚀介质为3.5% NaCl溶液和干燥空气，应变速率分别采用10⁻⁵、10⁻⁶/s和10⁻⁷/s，获取拉伸强度、断后延伸率和应力腐蚀敏感性指数（I_SSRT）等参数，同时结合OM、SEM等方式观察原始组织与断口形貌，从而阐明低成本钛合金板管材在模拟深水压力作用下的应力腐蚀行为及其失效机制。结果表明：四种钛合金材料的应力腐蚀最佳应变速率在10⁻⁵～10⁻⁶/s内，其中Ti6411板材在10⁻⁵/s和10⁻⁶/s两种条件下，I_SSRT数值分别为10.0%和9.1%，具有较为明显的应力腐蚀敏感性，而Ti52管材、TC4 ELI和Ti80合金的最大I_SSRT值均低于5%，应力腐蚀敏感性不明显。片层状Ti6411板材组织特征易产生应力集中效应，导致准解离断裂，断口表面存在黑色腐蚀产物，氧化膜破裂、选择性阳极溶解和氢脆机制共同主导模拟深水环境应力腐蚀现象，施加的恒定压力活化Cl⁻，加速穿透氧化膜，从而破坏氧化膜稳定性，增加H含量聚合形成氢气，拉应力加载和内部氢压耦合作用可降低材料耐腐蚀性。
- 低成本钛合金 /
- 深水压力 /
- 应力腐蚀敏感性
Abstract: This paper investigates the stress corrosion cracking (SCC) susceptibility of low-cost Ti6411 plate, Ti52 tube, marine TC4 ELI, and Ti80 alloys under simulated deep-water environment pressure using a high-pressure autoclave testing system. Slow-strain-rate tests (10⁻⁵, 10⁻⁶/s, and 10⁻⁷/s) were exposed to 3.5% NaCl solution and dry air with a hydrostatic pressure of 7.5 MPa. The tensile parameters and stress corrosion susceptibility index (I_SSRT) were obtained. Furthermore, the microstructures and fracture features have been observed to elucidate the stress corrosion behavior and failure mechanisms of low-cost titanium alloy plates and tubes using OM and SEM under simulated deep-water pressure. The results indicated that the optimal strain rate is within 10⁻⁵/s and 10⁻⁶/s. Specifically, the I_SSRT values of Ti6411 plate are 10.0% and 9.1% with strain rates of 10⁻⁵/s and 10⁻⁶/s, respectively. A notable stress corrosion susceptibility was obtained. In contrast, all I_SSRT values of Ti52 tube, TC4 ELI, and Ti80 alloys were below 5%, indicating no significant stress corrosion susceptibility. Particularly, Ti6411 plate with lamellar microstructure is sensitive to stress concentration effects and exhibits quasi-cleavage fracture. Some black corrosion products can be observed on the fracture morphologies. It is believed that the corrosion mechanisms were coupled effects of selective anodic dissolution and hydrogen embrittlement. Hydrostatic pressure can promote Cl^- to weaken the passive film and increase hydrogen content. As a result, both of the tensile loading and internal hydrogen pressure reduce the corrosion resistance of the titanium alloys.
- low-cost titanium alloys /
- hydrostatic pressure /
- stress corrosion cracking susceptibility

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图 1 不同试验条件下钛合金原始微观组织

Figure 1. Initial microstructures of titanium alloys under different conditions

(a) Ti6411; (b) Ti52; (c) TC4 ELI; (d) Ti80

下载: 全尺寸图片幻灯片

图 2 不同试验条件下的拉伸应力-应变曲线

Figure 2. Tensile curves under different conditions

(a) Ti6411; (b) Ti52; (c) TC4 ELI; (d) Ti80

下载: 全尺寸图片幻灯片

图 3 不同试验条件下的拉伸断口形貌特征

Figure 3. Tensile fracture morphologies of titanium alloys under different conditions

(a1) ～(a3) Ti6411; (b1)～(b3) Ti52; (c1)～(c3) TC4 ELI; (d1)～(d3) Ti80

下载: 全尺寸图片幻灯片

表 1 不同试验条件下钛合金拉伸性能（平均值）

Table 1. Slow-strain-rate tensile properties of titanium alloys under different test conditions (average value)

Materials	Conditions× 10⁷/(s⁻¹)	R_m(corrosion)/ R_{m(Dry air)}	A_m(corrosion)/ A_{m(Dry air)}	I_SSRT
Ti6411	1	98.2	86.9	3.7
	10	95.3	74.2	9.1
	100	97.0	61.1	10.0
Ti52	1	103.0	89.9	−1.4
	10	101.0	108.1	−2.3
	100	97.7	94.5	3.2
TC4 ELI	1	100.6	101.8	−1.0
	10	98.0	88.2	4.4
	100	100.9	136.2	−5.1
Ti80	1	100.7	90.0	1.3
	10	98.9	92.0	2.7
	100	109.9	123.8	−14

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