Processing, Microstructure and Hydrogen embrittlement of 3D printed Inconel718

3D 打印 Inconel718 的加工、微观结构和氢脆

• 批准号: 2296082
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2296082
• 关键词: Processing; Microstructure; Hydrogen; embrittlement; 3D

Additive manufacturing (AM), also known as 3D printing, is expected to revolutionise the way of designing, supplying and making materials, holding great potential for automotive, energy, medical and aerospace applications. Amongst all AM, powder bed fusion is the most effective method to fabricate complex metallic components with high accuracy.Inconel718 is one of the most widely used nickel-based alloys thanks to its good weldability, excellent resistance to fatigue, to hot corrosion and to wear and high strength, making it an excellent candidate for high-temperature applications including in gas and oil.Although the microstructure and mechanical behaviour of Inconel 718 have been extensively studied, there is still significant lack of understanding regarding the relationship between AM process parameters, microstructure and performance - in particular the hydrogen embrittlement. Therefore, this project will use the laser powder bed fusion to fabricate Inconel718 with various print parameters. Subsequently, detailed studies will be carried to examine the microstructure evolution of the alloy from single to multiple tracks of deposition and in subsequent heat treatments. Mechanical tests will be done on both as-printed and heat-treated conditions with and without charged Hydrogen to study the susceptibility of the alloy to hydrogen embrittlement.Tasks will be carried out in this project:- Fabrication: Relating print parameters (i.e laser intensity, exposure time, laser spot distance, hatch spacing, layer thickness and scanning strategy) to consolidation and solidification microstructure.- Uniaxial tension testing at room and elevated temperatures will be carried out on the printed alloy with and without the charging of Hydrogen to study the hydrogen embrittlement. - Microstructure characterisation: Microstructure morphology, crystal phases, crystallographic orientations and chemical distribution of as-printed and deformed samples will be characterised by optical and scanning/transmission electron microscopy (including EDX) and X-ray diffraction.

增材制造（AM），也被称为3D打印，预计将彻底改变设计，供应和制造材料的方式，为汽车，能源，医疗和航空航天应用提供巨大潜力。在所有的增材制造技术中，粉末床熔化是制造高精度复杂金属零件最有效的方法。Inconel 718是应用最广泛的镍基合金之一，由于其良好的可焊性、优异的抗疲劳性、抗热腐蚀性和耐磨性以及高强度，使其成为高-虽然Inconel 718的微观结构和机械性能已经被广泛研究，对于AM工艺参数、微观结构和性能之间的关系，特别是氢脆性，仍然缺乏理解。因此，本计画将利用雷射粉末床熔融法，以不同的打印参数来制造Inconel 718。随后，将进行详细的研究，以检查合金的微观结构的演变，从单一到多个轨道的沉积和在随后的热处理。机械测试将在有和没有充氢的打印和热处理条件下进行，以研究合金对氢脆的敏感性。该项目的任务将在该项目中进行：-制造：将打印参数（即激光强度，曝光时间，激光光斑距离，舱口间距，层厚度和扫描策略）与固结和凝固微观结构相关联。在室温和高温下对打印的合金进行单轴拉伸试验，并在充氢和不充氢的情况下研究氢脆。- 微观结构表征：将通过光学和扫描/透射电子显微镜（包括EDX）和X射线衍射来表征打印和变形样品的微观结构形态、晶相、晶体取向和化学分布。