Development of Post Additive Manufacturing Treatments to Enhance Mechanical Properties of IN 718 Superalloy

增材制造（AM），通常称为3D打印，正在彻底改变许多行业的制造工艺，因为它能够生产更坚固、更轻的创新部件。增材制造已成为流行的塑料生产零件，但将有一个更大的商业影响时，它可以用来生产先进的材料，创新的应用，包括在航空航天工业。AM目前可用于生产具有复杂几何形状的金属部件，这些部件几乎无法通过其他制造工艺生产。然而，虽然可以生产出具有所需几何形状和尺寸的产品，但满足航空航天工业的严格性能要求仍然是一个巨大的挑战。航空发动机用镍基高温合金经AM处理后，由于内部缺陷（如气孔、裂纹和非晶组织）的存在，其机械强度较低。Precision ADM是一家加拿大公司，帮助其客户公司利用先进的数字制造技术，包括AM。本研究的目的是利用先进的热机械处理技术，有效地消除航空高温合金IN 718的气孔、裂纹、残余应力和有害微观组织，提高其力学性能。将使用人工神经网络（ANN）建模来优化AM参数，并将进行系统研究以在升高的温度下使用施加的压力来消除缺陷，去除有害的微观成分，这将有助于开发一种有效的工艺，消除降低机械性能的主要问题，并使Precision ADM能够提供专业的以可靠的性能提供给客户。在加拿大发展增材制造能力将导致航空航天工业的重大经济增长，并有助于加拿大在先进制造技术方面的竞争力。

Additive manufacturing (AM), commonly known as 3D printing, is revolutionizing the manufacturing processin many industries, due to its capability to produce innovative parts that are stronger and lighter. AM hasbecome popular for producing parts from plastics but will have a much greater commercial impact when it canbe used to produce advanced materials for innovative applications, including in the aerospace industry. AMcan currently be used to produce metallic components with complicated geometries that are almost impracticalto produce by other manufacturing processes. However, while a product can be produced with desiredgeometry and dimensions, meeting the rigorous performance requirements of the aerospace industry remains aconsiderable challenge. Nickel-based superalloys processed by AM for aeroengine applications are prone tohaving lower mechanical strength due to internal defects, such as porosity, cracks, and formation of deleteriousmicroconstituent. Precision ADM is a Canadian company that helps their customer companies to takeadvantage of advanced digital manufacturing technologies, including AM. The aim of the proposed research isto use innovative AM thermo-mechanical treatments to effectively eliminate pores, cracks, residual stresses,deleterious microconstituent, and improve mechanical properties of the most widely used aerospace superalloy,IN 718. Artificial neural network (ANN) modeling will be used to optimize the AM parameters and asystematic study will be performed to use imposed pressure at elevated temperatures to eliminate defects,remove deleterious microconstituent, and enhance the formation of essential strengthening phases in the alloy.This will enable the development of an effective procedure that eradicates major problems that degrademechanical properties and enable Precision ADM to provide specialized products with reliable properties to itscustomers. Developing AM capabilities in Canada will lead to major economic growth in the aerospaceindustry and aid Canada's competitiveness in advanced manufacturing technology.