CAREER: Understanding the Corrosion Fatigue Behavior of Additively Processed Metals through an Integrated Experimental and Computational Approach

职业：通过综合实验和计算方法了解增材加工金属的腐蚀疲劳行为

• 批准号: 2044972
• 负责人: Yao Fu
• 金额: $ 59.49万
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-10-01 至 2021-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2044972&HistoricalAwards=false
• 关键词: CAREER; Understanding; Corrosion; Fatigue; Behavior; CAREER; Understanding; Corrosion; Fatigue; Behavior

This Faculty Early Career Development (CAREER) award will focus on determining the mechanisms governing the corrosion fatigue behavior of additively manufactured metals, especially due to the influence of unique microstructural features and residual stress introduced during processing. Additive manufacturing has gained wide attention in recent years because it can be used to produce geometrically and compositionally complex parts, as well as provide on-demand production and repair capability. Its potential to manufacture true load-bearing parts, however, is not yet fully realized due to several issues. In particular, the complexity of the resultant microstructural features makes it difficult to distinguish their respective effects on fracture and fatigue performance. This project will answer two relevant question with focus on corrosive environments: 1) How does the fatigue behavior of additively processed alloys differ from that of their conventional counterparts under normal and corrosive environments, respectively? and 2) How does the microstructure contribute to the observed differences in behavior? Insights gained from the award will guide the design and manufacture of additively manufactured parts and prolong their service life by limiting the causes of fatigue failure in corrosive environments. Thus, the research will not only promote the progress of science but will also advance national prosperity and welfare by reducing the tremendous financial losses related to corrosion damage. In addition, this award will encourage women in engineering by launching a “Women in Flight” club and perform outreach to high school science teachers and students through creative audiovisual learning modules.The unique microstructure formed in additively manufactured metals merit critical investigation into its effect on environmentally-assisted fatigue behavior. This project will employ a combined computational and experimental approach to: 1) evaluate the macroscopic fatigue properties of conventional and additively manufactured alloys in air and corrosive environment using high-cycle fatigue testing; 2) elucidate effects of microscopic features and defects on the local passivity and corrosion properties using electrochemical microcell and adaptive Kinetic Monte Carlo modeling techniques, and 3) reveal the mechanism and the influence of individual microstructure features and their interaction by developing a microstructure-sensitive multiphysics computational framework based on phase field and crystal plasticity modeling. The features that will be considered are sub-grain dislocation networks, solidification texture, porosity, and chemical heterogeneity, as well as residual stress. It is expected that he experimentally-validated modeling framework will introduce a new capability to advance the mechanistic understanding of deformation and failure of additively manufactured alloys in corrosive environment.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这项教师早期职业发展（职业）奖将重点介绍管理添加制造金属腐蚀疲劳行为的机制的机制，尤其是由于独特的微观结构特征和处理过程中引入的残留压力的影响。近年来，增材制造业引起了广泛的关注，因为它可用于生产几何和合成的复杂零件，并提供按需生产和维修能力。但是，由于几个问题，它制造真正承重零件的潜力尚未完全实现。特别是，所得的微结构特征的复杂性使得很难区分它们对断裂和疲劳性能的影响。该项目将以腐蚀性环境的重点回答两个相关问题：1）在正常和腐蚀性环境下，额外处理的合金的疲劳行为分别与传统同行的合金不同？ 2）微观结构如何促进观察到的行为差异？从奖项中获得的见解将指导和制造另外制造零件的设计和制造，并通过限制腐蚀性环境中疲劳失败的原因来延长其使用寿命。这项研究不仅将促进科学的进步，而且还将通过减少与腐蚀损失相关的巨大财务损失来促进国家繁荣和福利。此外，该奖项将通过创建“飞行中的女性”俱乐部来鼓励妇女在工程上，并通过创造性的视听学习模块向高中科学教师和学生进行宣传。在此外，还形成了既有生产金属的独特微观结构，又对其对环境辅助疲劳行为的影响进行了重要的投资。该项目将采用一种组合的计算和实验方法来：1）使用高自行车疲劳测​​试评估常规合金和腐蚀性环境中常规合金的宏观疲劳特性； 2）使用电化学微电池和自适应动力学蒙特卡洛建模技术以及3）阐明了微观特征和缺陷对局部被动和腐蚀特性的影响，以及3）揭示了基于微观结构敏感的多型多型物质构建相的机制和相互作用的机制和影响。将被认为的特征是亚细胞位错网络，固化纹理，孔隙率和化学异质性以及残留应力。可以预期，他实验验证的建模框架将引入新的能力，以提高对腐蚀性环境中额外制造合金的变形和失败的机械理解。该奖项反映了NSF的法定任务，并被认为是通过基金会的智力优点和更广泛的影响审查的审查标准来通过评估来通过评估来获得的支持。