在<strong>3.5%NaCl</strong>溶液中压力变化对<strong>Ti80</strong>合金应力腐蚀行为的影响

doi:10.11902/1005.4537.2025.346

中国腐蚀与防护学报

2026, Vol. 46

Issue (5): 1508-1516 CSTR: 32134.14.1005.4537.2025.346 DOI: 10.11902/1005.4537.2025.346

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在3.5%NaCl溶液中压力变化对Ti80合金应力腐蚀行为的影响

贾梦瑶¹, 张伟强¹, 王媛², 谭季波²(

), 邱建科², 郝延天¹, 吴欣强²

^1.沈阳理工大学材料科学与工程学院沈阳 110159
^2.中国科学院金属研究所沈阳 110016

Effect of Pressure Variation on Stress Corrosion Behavior of Ti80 Alloy in 3.5%NaCl Solution

JIA Mengyao¹, ZHANG Weiqiang¹, WANG Yuan², TAN Jibo²(

), QIU Jianke², HAO Yantian¹, WU Xinqiang²

^1.School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

贾梦瑶, 张伟强, 王媛, 谭季波, 邱建科, 郝延天, 吴欣强. 在3.5%NaCl溶液中压力变化对Ti80合金应力腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2026, 46(5): 1508-1516.
Mengyao JIA, Weiqiang ZHANG, Yuan WANG, Jibo TAN, Jianke QIU, Yantian HAO, Xinqiang WU. Effect of Pressure Variation on Stress Corrosion Behavior of Ti80 Alloy in 3.5%NaCl Solution[J]. Journal of Chinese Society for Corrosion and protection, 2026, 46(5): 1508-1516.

全文: PDF(21761 KB) HTML

摘要:

采用楔形张开加载(WOL)试样,系统研究了0.1~15 MPa压力下Ti80合金在3.5%NaCl溶液中的应力腐蚀开裂(SCC)行为，重点分析了压力对SCC开裂门槛值(K_ISCC)及断裂机理的影响。结果表明，在0.1~10 MPa压力范围内，Ti80合金在3.5%NaCl溶液中的K_ISCC值介于50.36~53.51 MPa·m^1/2之间；当压力升至15 MPa时，K_ISCC平均值下降至47.79 MPa·m^1/2，SCC敏感性增强。断口主要由疲劳裂纹预制区、SCC开裂区和撕裂区组成，其中SCC开裂区呈现粗糙多孔形貌，表现为准解理开裂与局部溶解特征，且随压力升高脆性增强。EBSD分析进一步表明，裂纹扩展以穿晶断裂为主，伴随局部晶间腐蚀与分枝现象；高压下裂纹尖端塑性区缩小，局部应变集中加剧，表明了氢增强局部塑性(HELP)机制的活化。综上，Ti80合金在3.5%NaCl溶液中的SCC属于“阳极溶解”与“氢致开裂”的复合机制，静水压力通过促进Cl^-渗透及氢在局部富集，提高了材料的SCC敏感性。

关键词 ： Ti80合金, 静水压力, 应力腐蚀开裂, 腐蚀机理

Abstract：

The stress corrosion cracking behavior of Ti80 Ti-alloy in a 3.5%NaCl solution under pressures within a range from 0.1 to 15 MPa was systematically investigated using wedge-opening loading specimens, with emphasis on the influence of pressure on the SCC threshold (K_ISCC) and fracture mechanism. The results indicate that within the pressure range of 0.1-10 MPa, the K_ISCC values of Ti80 Ti-alloy in the 3.5%NaCl solution ranged between 50.36 and 53.51 MPa·m^1/2. When the pressure increased to 15 MPa, the average K_ISCC value decreased to 47.79 MPa·m^1/2, indicating the SCC susceptibility was enhanced. The fracture surfaces primarily consisted of a fatigue pre-cracked zone, SCC propagation zone, and tearing zone. The SCC zone exhibited a rough and porous morphology, characterized by typical quasi-cleavage fracture combined with local dissolution features, and the brittle characteristics intensified with the increasing pressure. Electron backscatter diffraction analysis further revealed that the crack propagation was predominantly transgranular, accompanied by local intergranular corrosion and branching phenomena. Under high pressure, the plastic zone at the crack tip was reduced, and local strain concentration became significant, indicating the activation of the hydrogen-enhanced localized plasticity mechanism. Comprehensively, the SCC of Ti80 Ti-alloy in 3.5%NaCl solution follows a combined mechanism of “anodic dissolution” and “hydrogen-induced cracking.” Hydrostatic pressure significantly increases the SCC susceptibility of the Ti-alloy by promoting Cl^- penetration and accelerating hydrogen accumulation.

Key words： Ti80 alloy hydrostatic pressure stress corrosion cracking (SCC) corrosion mechanism

收稿日期: 2025-11-04 32134.14.1005.4537.2025.346

ZTFLH:

TG174.3

基金资助:中国科学院青年创新促进会项目(2022188);辽宁省优秀青年基金(2024JH3/10200020)

通讯作者: 谭季波，E-mail：jbtan10s@imr.ac.cn，研究方向为三代压水堆及四代铅冷快堆结构材料环境相容性

Corresponding author: TAN Jibo, E-mail: jbtan10s@imr.ac.cn

作者简介: 贾梦瑶，女，2000年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2025.346 或 https://www.jcscp.org/CN/Y2026/V46/I5/1508

图1 Ti80合金的金相组织

图2 WOL试样的几何示意图及加工后试样照片

表1 Ti80合金裂纹长度及KISCC值计算结果

图3 Ti80合金在不同压力下裂纹扩展长度及扩展速率随时间的变化

图4 KISCC值随压力变化图

图5 不同压力下Ti80合金恒位移试验后宏观断口形貌

图6 NaCl溶液中不同压力下Ti80试样SCC断口SEM形貌

图7 Ti80合金在3.5%NaCl溶液中的裂纹扩展路径EBSD结果

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