Characterization and mechanisms of formation of disturbed layer during rolling of aluminium alloys

铝合金轧制过程中扰动层的特征及形成机制

• 批准号: 419620-2011
• 负责人: Riahi, Reza
• 金额: $ 2.91万
• 依托单位: University of Windsor
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=551634
• 关键词: Characterization; mechanisms; formation; disturbed; layer

Aluminum sheets experience high compressive and shear stresses as well as high temperature during hot rolling. These severe conditions alter the local composition and microstructure of the surface by formation of localized layers known as "disturbed layer". The formation of disturbed layer changes the appearance (colour), tribological behaviour, weldability, surface tension, and corrosion resistance of aluminum roll-products. The project aims to improve our understanding of the tribological factors that affect formation of the disturbed surface layer during aluminum rolling using a custom made rolling simulator at the University of Windsor. The disturbed layer is speculated to form mostly during hot rolling process, where the sheet enters to the roll gap at a temperature range of 340C - 550C. Due to sliding friction between the rolls and the sheet surfaces, the speed of the sheet at the exit side of the tandem mills is normally higher than the linear speed of the rolls (forward speed). Due to forward speed, the rolls slide against aluminum sheet surfaces causing localized shear deformation on surface of aluminum sheet mixed with lubricant residues and surface oxides forming the disturbed layer. The proposed research will be conducted by i) in depth microstructural and chemical analyses of surfaces and subsurfaces of the aluminum samples and the steel rolls before and after rolling experiments ii) determining the mechanisms of formation of disturbed layer under various rolling conditions and iii) construction of maps that show the thickness, morphology, composition, and structure of the disturbed layer as functions of rolling parameters. These results will provide significant environmental and economic benefits, including lower energy consumption to produce final products, less re-work, and lower consumption of cleaning chemicals for removal of the layer, and higher quality products.

铝板在热滚动过程中经历高压缩应力和高温。这些严重的条件通过形成被称为“干扰层”的局部层来改变表面的局部组成和微观结构。受干扰层的形成改变了铝制产品的外观（颜色），摩擦学行为，可焊性，表面张力和耐腐蚀性。该项目旨在提高我们对铝制滚动过程中使用温莎大学的定制滚动模拟器在铝滚动过程中影响受干扰表面层形成的摩擦学因素的理解。据推测，受干扰的层主要是在热滚动过程中形成的，在热滚动过程中，该板在340c -550c的温度范围内进入滚动缝隙。由于滚动和薄板表面之间的滑动摩擦，串联磨机出口侧的床单的速度通常高于滚动的线性速度（向前速度）。由于前进速度，卷卷在铝板表面上滑动，导致铝板表面上的局部剪切变形，与润滑剂残基混合在一起，表面氧化物形成干扰层。拟议的研究将由i）i）在深度微观结构和化学分析中对铝样品的表面和亚面的微观结构和化学分析进行，以及滚动实验之前和之后的钢卷图表显示出干扰层作为滚动参数功能的厚度，形态，组成和结构的地图。这些结果将提供重大的环境和经济利益，包括降低能源消耗，以生产最终产品，更少的重新工作以及降低清洁化学物质以去除层以及较高质量的产品。