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Anisotropic mechanical and fatigue behaviour of Inconel718 produced by SLM in LCF and high‐temperature conditions
Fatigue & Fracture of Engineering Materials & Structures ( IF 3.7 ) Pub Date : 2020-11-06 , DOI: 10.1111/ffe.13373
F. Sausto 1 , G. Marchese 2 , E. Bassini 2 , M. Calandri 2 , S. Biamino 2 , D. Ugues 2 , S. Foletti 1 , S. Beretta 1
Affiliation  

Additive manufacturing (AM) is one of the processes with the most potential for producing components used in internal combustion engines and features high efficiency due to the possibility of building very complex shapes. Several drawbacks of parts produced using AM are still unresolved, like poor surface quality, the presence of internal defects and anisotropic mechanical behaviour, which all contribute to decreasing the fatigue strength compared with the material produced using conventional processes. The effect of building direction on both the macroscopic mechanical behaviour and the crack propagation mechanism of Ni‐base superalloy Inconel718 produced using AM was investigated under the combined effect of low cycle fatigue (LCF) and high temperature. The different crack growth mechanisms investigated using compact tension (CT) specimens, tested at high temperature, showed a significant difference between the two building directions. The LCF fatigue experiments also showed a significant difference in the ε‐N curves from the two directions together with a high level of scatter due to the dispersion of the defect size at the fracture origin. The dimensions of the defects (as measured using the urn:x-wiley:8756758X:media:ffe13373:ffe13373-math-0001 parameter) were analysed by means of extreme value statistics and showed a significant difference between the two orientations investigated. The aim of this work is to propose a simplified approach (based on ΔJeff concepts) to estimate the fatigue life of a component produced using AM that takes into account the material variability due to the combined effect of mechanical anisotropic behaviour and the presence of defects at high‐temperature conditions.

中文翻译:

SLM在LCF和高温条件下生产的Inconel718的各向异性力学和疲劳行为

增材制造(AM)是最有可能生产用于内燃机的零部件的工艺之一,并且由于具有构建非常复杂的形状的可能性而具有很高的效率。与使用传统工艺生产的材料相比,使用AM生产的零件的一些缺陷仍未解决,例如不良的表面质量,内部缺陷的存在和各向异性的机械性能,所有这些缺陷都有助于降低疲劳强度。在低周疲劳(LCF)和高温共同作用下,研究了构造方向对使用AM生产的镍基高温合金Inconel718的宏观力学行为和裂纹扩展机理的影响。使用紧密拉伸(CT)标本研究了不同的裂纹扩展机制,在高温下进行的测试显示,两个建筑方向之间存在显着差异。LCF疲劳实验还表明,由于断裂起点处缺陷尺寸的分散,两个方向的ε‐N曲线存在显着差异,并且散射水平较高。缺陷的尺寸(使用缸:x-wiley:8756758X:media:ffe13373:ffe13373-math-0001参数)通过极值统计进行了分析,并且显示了所研究的两个方向之间的显着差异。这项工作的目的在于提出一种简化的方法(基于Δ Ĵ EFF概念)来估计使用AM,考虑到该材料可变性产生的部件的疲劳寿命由于机械各向异性行为的组合效应的存在和高温条件下的缺陷。
更新日期:2020-12-03
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