Mechanical properties of thin wall specimens produced by additive manufacturing methods

增材制造方法生产的薄壁试样的机械性能

• 批准号: 576495-2022
• 负责人: Yue, StephenS
• 金额: $ 2.91万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=761077
• 关键词: Mechanical; properties; thin; wall; specimens

Additive manufacturing (AM) technology opens new opportunities for the economy and society of Canada. It can facilitate the production of strong, light-weight products for many sectors, including aerospace and biomedical, and it allows designs that were not possible with previous manufacturing techniques. Aluminum and titanium alloys are of great interest for AM since these are relatively expensive metals and AM can minimize the waste of material that is generated by traditional casting, forging and machining routes. Regarding the specific problem of thin walls, as section size decreases, surface sensitivity, i.e., surface finish, is much more influential on the properties In addition, due to the small feature dimensions, the thin walls are subjected to more significant thermal dissipation from the surrounding powder beds. As a result, thin features generated by AM processes often include defects such as un-melted powder inclusions, internal voids, cracks, and shape irregularities. Surface post-AM-processing techniques tackle the issues associated with the irregular morphology and the randomly positioned features on the surface of as-built AM material, by removing and/or smoothing the surface, or inducing a desired surface morphology or reducing the tensile surface residual stress. The goal of this partnership is therefore to understand the effect of powder characteristics and AM process variables and post AM build treatments on the additive manufacturing (AM) of components with thin wall dimensions, the ultimate goal being to be able to design powders with the most desirable characteristics for such AM builds made by laser- powder bed fusion (L-PBF) and binder jet processes. Since this project will be performed by 2 Ph.D. students, another major outcome will be to increase the AM technological base in Quebec and Canada. The project is a collaboration between McGill University, A P and C, a powder manufacturing company, and Nanogrande, a Canadian based manufacturer of high-resolution 3D printers, metal 3D parts and the first with nano additive manufacturing technology with metal powders. All three already enjoy strong collaborations and this project will readily build on this foundation.

增材制造（AM）技术为加拿大的经济和社会带来了新的机遇。它可以促进包括航空航天和生物医学在内的许多领域生产坚固、轻质的产品，并且可以实现以前制造技术无法实现的设计。 铝和钛合金对增材制造非常感兴趣，因为它们是相对昂贵的金属，而且增材制造可以最大限度地减少传统铸造、锻造和机加工路线产生的材料浪费。 关于薄壁的具体问题，随着截面尺寸的减小，表面敏感性，即表面光洁度，对性能的影响更大。此外，由于特征尺寸小，薄壁受到更显着的热耗散。周围的粉床。因此，增材制造工艺产生的薄特征通常包括未熔化的粉末夹杂物、内部空隙、裂纹和形状不规则等缺陷。 表面增材制造后处理技术通过去除和/或平滑表面，或诱导所需的表面形态或减少拉伸表面，解决与竣工增材制造材料表面上的不规则形态和随机定位特征相关的问题残余应力。 因此，此次合作的目标是了解粉末特性、增材制造工艺变量以及增材制造后处理对薄壁尺寸部件增材制造 (AM) 的影响，最终目标是能够设计出具有最优化性能的粉末。通过激光粉末床熔合 (L-PBF) 和粘合剂喷射工艺制造的增材制造产品具有理想的特性。由于该项目将由 2 名博士执行。学生们，另一个主要成果将是增加魁北克和加拿大的增材制造技术基础。 该项目是麦吉尔大学、粉末制造公司 A P and C 和加拿大高分辨率 3D 打印机、金属 3D 零件制造商以及首家采用金属粉末纳米增材制造技术的制造商 Nanogrande 之间的合作。 这三者已经建立了强有力的合作，这个项目将很容易建立在这个基础上。