TC18钛合金拉伸应力腐蚀行为及数值模拟研究

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL Journal of Engineering Materials and Technology-transactions of The Asme Pub Date : 2023-04-11 DOI:10.1115/1.4062289
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引用次数: 0

摘要

对腐蚀损伤过程的理解和模拟对于预测工程结构的剩余使用寿命、进行可靠的可靠性分析和设计以提高材料对腐蚀损伤的整体抵抗力至关重要。利用周动力学腐蚀理论和机械化学效应理论,建立了机械-电化学耦合的PD腐蚀模型。该模型能够模拟由机械-电化学现象的共同和相互作用影响引起的降解的发生。研究了TC18钛合金在EXCO溶液中在31%σ0.2、47%σ0.2和62%σ0.2应力载荷下的腐蚀行为。结合微观形貌和电化学参数,研究了拉伸载荷对TC18钛合金腐蚀行为的影响,以验证阳极反应速率对拉伸应力的依赖性。研究结果表明,随着应力水平的增加,TC18钛合金的腐蚀电位负移,腐蚀电流密度增加,腐蚀加剧。当满足相变机制时,边界运动自发发生。该模型可以安全地用于复杂的几何形状,并作为研究有利于或有利于诱发腐蚀的环境中裂纹扩展的基础。
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Study on the Corrosion Behavior and Numerical Simulation of TC18 Titanium Alloy under Tensile Stress
Both understanding and simulation of the process of corrosion damage are crucial for the prediction of remaining service life of engineering structures, sound reliability analysis, and design for the purpose of enhancing overall resistance of the material to corrosion damage. A coupled mechano-electrochemical PD corrosion model was established by using the peridynamic (PD) corrosion theory and the mechano-chemical effect theory.The model is capable of simulating the occurrence of degradation caused by the conjoint and mutually interactive influences of mechano-electrochemical phenomena. Corrosion behavior of TC18 titanium alloy in EXCO solution under stress loads of 31% σ0.2, 47% σ0.2 and 62% σ0.2 was studied. The effect of tensile loads on the corrosion behavior of TC18 titanium alloy was examined by combining the micromorphology and electrochemical parameters to verify the dependence of reaction rate occurring at the anode on tensile stress. Results of this study shed light as the stress level increases, the corrosion potential of TC18 titanium alloy shifts negatively, the corrosion current density increases and the corrosion intensifies. When the phase transition mechanism is satisfied, boundary movement occurs spontaneously.This model can safely be employed to complex geometric shapes and as a basis for studying crack propagation in environments that are favorable or conducive for inducing corrosion.
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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