高静水压力下近固强空化致金属材料损伤的宏观/微观特征及其机理研究

近固空化对液体环境中服役金属材料的破坏极大，而深海探测、舰船等面临高静水压条件，本项目拟在前期工作基础上，采用理论模拟、反演分析，并结合金属材料损伤的微观特征分析，深入理解高静水压力下近固空泡溃灭原因和机理；研究近固强空化致金属材料损伤的宏观/微观形貌和特征、损伤脱落物的组织结构和化学成分、材料性能对损伤特征的影响，阐释高静水压力下近固强空化致金属材料损伤的机理，可望突破现有材料性能测试方法难以反映近固强空化致金属材料损伤的宏观/微观形貌特征的局限；探索空化强度与近固强空化致金属材料损伤效应间的关系，可望建立一种评价高静水压力下金属材料抗空蚀性能的方法。研究结果对认识高静水压力下近固空泡溃灭过程中气泡动力学行为及其与金属材料相互作用机理，研究在深海下服役金属材料的抗空蚀性能具有重要学术和国家战略需求意义。

Near-solid cavitation is extremely damaging to metal materials in service in the liquid environment, while deep-sea exploration and ships face high hydrostatic conditions. Based on the preliminary work, this project intends to use theoretical simulation and inversion analysis, combined with the analysis of microscopic characteristics of metal material damage, to deeply understand the causes and mechanisms of collapse of near-solid cavitation under high hydrostatic pressure. Study the macro / micro morphology and characteristics of metal material damage caused by near-solid strong cavitation, the structure and chemical composition of damage exfoliates, and the effects of material properties on the damage characteristics. Explain the mechanism of metal material damage caused by near-solid cavitation under high hydrostatic pressure.It is expected to break through the limitations of existed material performance testing methods that cannot evaluate the macro / micro morphological characteristics of metal damage caused by near-solid cavitation. By exploring the relationship between the cavitation strength and the damage effect of metal materials caused by near-solid cavitation, it is expected to establish a model to evaluate the anti-cavitation performance of metal materials under high hydrostatic pressure.The study of bubble dynamics during the collapse of near-solid cavitation under high hydrostatic pressure and the mechanism of its interaction with metal materials are of great academic value and national strategic significance for the study of the anti-cavitation performance of metal materials in service under the deep sea.