Correlation of Microstructure and Nanomechanical Properties of Additively Manufactured Inconel 718

IF 2.6 4区 工程技术 Q2 MECHANICS
Allen Kim, Lily Vu, Tony Chung, David Song, Junlan Wang
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引用次数: 0

Abstract

Additive manufacturing (AM) has emerged as a crucial technology in recent decades, particularly within aerospace industry. However, the thermally cyclic nature of these processes introduce significant variations and defects in microstructure, which can adversely affect final part performance and hinder the widespread adoption of the technology. Traditionally, characterization of AM parts has relied on conventional bulk testing methods, which involve analyzing many samples to gather sufficient data for statistical analysis. Unfortunately, these methods are unable to account for local nanoscale variations in material properties caused by the microstructure, as they measure a single averaged property for each tested sample. In this work, we use AM Inconel 718 as a model system in developing a novel approach to correlate nanomechanical properties obtained through nanoindentation with microstructure obtained through electron backscatter diffraction (EBSD). By associating mechanical properties obtained from each indent with the corresponding crystallographic direction measured with EBSD, we calculate the weighted average hardness and modulus for each orientation. This enables us to generate inverse property figure maps depicting the relationship between mechanical properties and crystallographic direction. Our method yields results in good agreement with literature when calculating the part modulus and hardness. Furthermore, it effectively captures nanoscale variations in properties across the microstructure. The key advantage of this methodology is its capability to rapidly test a single AM part and generate a large dataset for statistical analysis. Complementing existing macroscale characterization techniques, this method can help improve AM part performance prediction and contribute to the wider adoption of AM technologies.
添加铬镍铁合金718微观结构与纳米力学性能的相关性
近几十年来,增材制造(AM)已成为一项关键技术,尤其是在航空航天行业。然而,这些工艺的热循环性质在微观结构中引入了显著的变化和缺陷,这可能会对最终零件的性能产生不利影响,并阻碍该技术的广泛采用。传统上,AM零件的表征依赖于传统的批量测试方法,该方法涉及分析许多样本以收集足够的数据进行统计分析。不幸的是,这些方法无法解释由微观结构引起的材料性能的局部纳米级变化,因为它们测量每个测试样品的单个平均性能。在这项工作中,我们使用AM Inconel 718作为模型系统,开发了一种新的方法,将通过纳米压痕获得的纳米机械性能与通过电子背散射衍射(EBSD)获得的微观结构相关联。通过将从每个压痕获得的机械性能与用EBSD测量的相应结晶方向相关联,我们计算了每个取向的加权平均硬度和模量。这使我们能够生成描述力学性质和结晶方向之间关系的逆性质图。在计算零件模量和硬度时,我们的方法得出的结果与文献一致。此外,它可以有效地捕捉微观结构中纳米级性能的变化。该方法的主要优点是能够快速测试单个AM零件并生成用于统计分析的大型数据集。该方法补充了现有的宏观表征技术,有助于提高AM零件的性能预测,并有助于AM技术的更广泛应用。
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来源期刊
CiteScore
4.80
自引率
3.80%
发文量
95
审稿时长
5.8 months
期刊介绍: All areas of theoretical and applied mechanics including, but not limited to: Aerodynamics; Aeroelasticity; Biomechanics; Boundary layers; Composite materials; Computational mechanics; Constitutive modeling of materials; Dynamics; Elasticity; Experimental mechanics; Flow and fracture; Heat transport in fluid flows; Hydraulics; Impact; Internal flow; Mechanical properties of materials; Mechanics of shocks; Micromechanics; Nanomechanics; Plasticity; Stress analysis; Structures; Thermodynamics of materials and in flowing fluids; Thermo-mechanics; Turbulence; Vibration; Wave propagation
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