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首页> 外文期刊>Materials Science and Engineering >Influence of process parameters and heat treatments on the microstructures and dynamic mechanical behaviors of Inconel 718 superalloy manufactured by laser metal deposition
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Influence of process parameters and heat treatments on the microstructures and dynamic mechanical behaviors of Inconel 718 superalloy manufactured by laser metal deposition

机译：工艺参数和热处理对激光金属沉积制备的Inconel 718高温合金的显微组织和动态力学性能的影响

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摘要

To achieve high-performance nickel-based superalloys by laser metal deposition (LMD) technology for applications in aeroengines, we prepared Inconel 718 superalloys by LMD with three groups of process parameters and then heat treated them by two different protocols. We carried out compressive experiments for these Inconel 718 samples over a wide range of strain rate (0.001–5000/s) to evaluate the effects of process parameters and heat treatments on their microstructures and dynamic mechanical properties. We observed both the initial microstructures and the failure characteristics of the samples using the optical microscope and the scanning electron microscope. We found that a higher energy input density during laser additive manufacturing led to a wider range of primary dendrite spacing. The plastic flow stress of the alloy decreased near-linearly with increase in primary dendrite spacing. The anisotropy of the compressive properties of the sample resulted from the anisotropy of the as-deposited and the direct aged structures, while the microstructural and mechanical anisotropy almost vanished after full heat treatment. We further carried out compressive experiments over a wide range of strain rate (0.001–5300/s) and temperature (298–1193 K) to understand the mechanical properties of Inconel 718 by LMD in an extremely high-strain rate and high-temperature loading environment. We noticed an anomalous high-temperature peak in the flow stress, in the flow stress vs. temperature relation, under different strain rates, and we proved that it is attributed to the third type of strain aging effect. Finally, by observing the compressive failure characteristics, we found that the propagation path of a crack is dependent on the loading direction. The compressive fractography morphology could reflect the effect of heat treatment on the ductility of the samples. Furthermore, it was evident that the initial defects (gas and shrinkage porosities) in Inconel 718 samples caused by LMD can contribute to the generation, deflection, and branching of cracks.
机译：为了通过激光金属沉积（LMD）技术获得用于航空发动机的高性能镍基高温合金，我们通过LMD制备了三组工艺参数的Inconel 718高温合金，然后通过两种不同的协议对其进行了热处理。我们对这些Inconel 718样品进行了广泛的应变速率（0.001-5000 / s）压缩试验，以评估工艺参数和热处理对其微观结构和动态力学性能的影响。我们使用光学显微镜和扫描电子显微镜观察了样品的初始微观结构和破坏特征。我们发现，激光增材制造过程中较高的能量输入密度导致较宽的一次枝晶间距范围。随着初级枝晶间距的增加，合金的塑性流动应力几乎呈线性下降。样品压缩性能的各向异性是由沉积态和直接时效结构的各向异性引起的，而在充分热处理后，微观结构和机械各向异性几乎消失了。我们进一步在较宽的应变速率（0.001-5300 / s）和温度（298-1119）K）范围内进行了压缩实验，以了解LMD在极高的应变速率和高温载荷下的Inconel 718的机械性能。环境。我们注意到在不同应变速率下，流动应力，流动应力与温度的关系中出现了一个高温异常峰，并证明了这归因于第三种应变时效效应。最后，通过观察压缩破坏特征，我们发现裂纹的传播路径取决于载荷方向。压缩形貌可以反映热处理对样品延展性的影响。此外，很明显，LMD在Inconel 718样品中产生的初始缺陷（气体和收缩孔隙率）可能会导致裂纹的产生，变形和分支。

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