Tribological Improvement of Titanium Alloys by Surface Engineering without Sacrificing their Fatigue Resistance

通过表面工程改进钛合金的摩擦学而不牺牲其抗疲劳性

• 批准号: RGPIN-2017-06906
• 负责人: Edrisy, Afsaneh
• 金额: $ 1.75万
• 依托单位: University of Windsor
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=712495
• 关键词: Tribological; Improvement; Titanium; Alloys; Surface

Titanium alloys despite their high strength-to-mass ratios and good fatigue and corrosion resistance exhibit poor tribological performance that preclude their use in aerospace and automotive components subjected to sliding contact. Compared to other materials of similar static and dynamic strength, titanium alloys have higher wear rates, higher coefficients of friction, and they are prone to galling and seizure. Various surface treatment methods have been employed to improve the wear and frictional behaviour of titanium alloys. However, they cause unacceptable changes in mechanical properties including decreases in fracture toughness and fatigue strength. The proposed research in the next five years will be aimed at improving microstructures and properties of low temperature ion nitrided alloys developed as a part of the applicant's previous NSERC Discovery program. New methods are proposed to control compositions and morphologies of the compound layer to increase ductility, toughness and wear resistance Accordingly, the main themes of the proposed research are: (A) Enhancement of low temperature ion nitriding treatment by following pre-treatment i) plastic deformation induced strain, ii) deposition of Vanadium on surface followed by thermal diffusion. (B) Development of a duplex surface treatment by deposition of DLC coatings on ion nitrided surfaces The experimental work will elucidate relationships between microstructures and wear and fatigue resistance by developing wear mechanism maps and identifying fatigue crack growth mechanisms. These investigations will provide insight into the micromechanisms of wear and fatigueensuring that the relationship between the microstructure and the mechanisms are established, which will help with the development of durable and practical surface treatments. Overall, the research will provide the scientific and engineering knowledge needed to produce energy efficient engineering components and technologies and train two Ph.D., one MASc and one undergraduate student.The unique training, knowledge, and skills obtained in this program will make these HQP very attractive to many Canadian manufacturers. These professionals will be equipped with valuable skill sets that can meet Canada's future requirements in technology and the automotive, and aerospace sectors as well as other industrial applications where they will be in high demand in this industry.

钛合金虽然具有较高的强度质量比以及良好的抗疲劳和耐腐蚀性，但其摩擦学性能较差，不能用于航空航天和汽车滑动接触部件。与其他静、动态强度相近的材料相比，钛合金具有更高的磨损率、更高的摩擦系数，并且容易产生磨损和卡箍。为了改善钛合金的磨损和摩擦性能，人们采用了各种表面处理方法。然而，它们会导致机械性能的不可接受的变化，包括断裂韧性和疲劳强度的降低。未来五年的拟议研究将旨在改善低温离子氮化合金的组织结构和性能，这是作为申请者之前的NSERC发现计划的一部分开发的。提出了控制复合层成分和形貌以提高塑性、韧性和耐磨性的新方法，研究的主要内容是：(A)通过以下前处理强化低温离子渗氮处理：1)塑性变形诱发应变；2)钒在表面沉积，然后热扩散。(B)通过在离子氮化表面沉积类金刚石涂层进行双重表面处理的开发实验工作将通过绘制磨损机理图和确定疲劳裂纹扩展机制来阐明微观组织与耐磨性和耐疲劳性之间的关系。这些研究将深入了解磨损和疲劳的微观机制，确保建立微观结构和机制之间的关系，这将有助于开发耐用和实用的表面处理。总体而言，这项研究将提供生产节能工程部件和技术所需的科学和工程知识，并培训两名博士、一名硕士和一名本科生。在该项目中获得的独特培训、知识和技能将使这些HQP对许多加拿大制造商非常有吸引力。这些专业人员将配备有价值的技能，能够满足加拿大未来在技术、汽车和航空航天部门以及该行业对他们的高需求的其他工业应用方面的要求。