Direct In Situ Analysis of Surface Flow Fields in Deformation Processing of Lightweight Structural Metals

轻质结构金属变形加工中表面流场的直接原位分析

• 批准号: 1562470
• 负责人: Srinivasan Chandrasekar
• 金额: $ 34.92万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-04-15 至 2021-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1562470&HistoricalAwards=false
• 关键词: Direct; Situ; Analysis; Surface; Flow

Light-weight structural alloys of aluminum, magnesium and titanium are of technological interest for use in applications in the discrete products sector, encompassing automotive, aerospace, energy systems and biomedical applications. Deformation processes such as extrusion, rolling, sheet-metal working, and forming methods are typically used to shape components from these metallic systems during manufacturing. The surface quality attributes of components, such as defects, finish and strength, created by the processes is to a large extent determined by the nature of metal flow at the surface. This surface flow also plays a major role in controlling friction and wear at the forming interfaces. For these reasons, there is a critical need for studying the fundamental nature of the flow in deformation processing so that component and product quality can be enhanced by suitable control of the flow. This award will address this need by supporting research to advancing the state-of-the-art of manufacturing process technologies in key industrial sectors. Complementing the research is an education program involving undergraduate researchers in creating a video gallery of flows for industry, and a modest focus on fostering entrepreneurship in graduate study. The research will study a model process system - a hard die (wedge) sliding against a workpiece - with three coordinated thrusts. Firstly, a deformation science initiative will utilize in situ observational techniques for high-resolution analysis of flow at workpiece surfaces and contacts. Flow phenomena (e.g., laminar, sinuous, instabilities), strain and strain rate fields, at the surfaces will be analyzed as a function of controllable process parameters. The interplay between flow type, friction, and defect formation will be explored. Secondly, workpiece surface quality will be examined in terms of microstructure, defect structures, mechanical properties, and topography. The surface quality attributes will be correlated with the flow fields. Thirdly, surface flow will be modeled using continuum approaches that incorporate material heterogeneity and grain level structure. By integrating the analyses results, a processing map, that demarcates flows and defects in terms of key material and process parameters, will be created. The study will be conducted specifically on model low-density structural alloys of aluminum, magnesium and titanium, selected for their experimental suitability and direct relevance to weight reduction in the discrete products sector. The techniques and findings will impact areas as diverse as materials processing, tribology, plasticity, and geophysical folding phenomena.

铝，镁和钛的轻质结构合金具有技术兴趣，可用于在离散产品行业中应用，包括汽车，航空航天，能源系统和生物医学应用。通常使用挤出，滚动，纸 - 金属工作和形成方法等变形过程，用于制造过程中这些金属系统的组件。由过程产生的组件的表面质量属性，例如缺陷，饰面和强度，在很大程度上取决于表面上的金属流的性质。该表面流在控制形成界面的摩擦和磨损中也起着重要作用。由于这些原因，在变形处理中研究流量的基本性质迫切需要，因此可以通过适当控制流量来增强组件和产品质量。该奖项将通过支持研究来推进主要工业领域的制造过程技术的最新技术来解决这一需求。补充这项研究的是一项教育计划，涉及本科研究人员为工业流动创建视频库，并专注于培养研究生研究的企业家精神。这项研究将研究模型过程系统 - 靠近工件的硬模（楔形）滑动 - 具有三个协调的推力。 首先，一项变形科学计划将利用原位观察技术来对工件表面和触点处的流量进行高分辨率分析。流动现象（例如，层流，弯曲，不稳定性），应变率和应变速率场将作为可控过程参数的函数分析。将探索流类型，摩擦和缺陷形成之间的相互作用。其次，将根据微观结构，缺陷结构，机械性能和地形检查工件表面质量。表面质量属性将与流场相关。第三，将使用连续方法对表面流进行建模，该方法结合了材料异质性和晶粒水平结构。通过集成分析结果，将创建一个处理映射，该处理图将创建以关键材料和过程参数来划分流和缺陷。该研究将专门针对铝，镁和钛的模型低密度结构合金，以实验性适用性以及与离散产品部门的重量减轻的直接相关性。这些技术和发现将影响像材料加工，摩擦学，可塑性和地球物理折叠现象一样多样化的领域。