Effect of Powder Recycling on the Fracture Behavior of Electron Beam Melted Alloy 718

Q4 Materials Science

Powder Metallurgy Progress Pub Date : 2018-06-01 DOI:10.1515/pmp-2018-0005

H. Gruber, P. Karimi, E. Hryha, L. Nyborg

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引用次数: 15

Abstract

Abstract Understanding the effect of powder feedstock alterations during multicycle additive manufacturing on the quality of built components is crucial to meet the requirements on critical parts for aerospace engine applications. In this study, powder recycling of Alloy 718 during electron beam melting was studied to understand its influence on fracture behavior of Charpy impact test bars. High resolution scanning electron microscopy was employed for fracture surface analysis on test bars produced from virgin and recycled powder. For all investigated samples, an intergranular type of fracture, initiated by non-metallic phases and bonding defects, was typically observed in the regions close to or within the contour zone. The fracture mode in the bulk of the samples was mainly moderately ductile dimple fracture. The results show a clear correlation between powder degradation during multi-cycle powder reuse and the amount of damage relevant defects observed on the fracture surfaces. In particular, samples produced from recycled powder show a significant amount of aluminum-rich oxide defects, originating from aluminum-rich oxide particulates on the surface of the recycled powder.

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粉末回收对电子束熔化718合金断裂行为的影响

了解多周期增材制造过程中粉末原料变化对制造部件质量的影响对于满足航空发动机关键部件的要求至关重要。本文研究了718合金在电子束熔化过程中的粉末回收，以了解其对Charpy冲击试验棒断裂行为的影响。采用高分辨率扫描电镜对原粉和再生粉试样的断口形貌进行了分析。对于所有被调查的样品，通常在靠近或在轮廓区内的区域观察到由非金属相和结合缺陷引起的晶间型断裂。大部分试样的断裂方式以中等韧性韧窝断裂为主。结果表明，在多次循环的粉末重复使用过程中，粉末的降解与断口上观察到的损伤相关缺陷数量之间存在明显的相关性。特别是，由回收粉末制成的样品显示出大量的富铝氧化物缺陷，这些缺陷源于回收粉末表面的富铝氧化物颗粒。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Powder Metallurgy Progress Materials Science-Metals and Alloys

CiteScore

1.00

自引率

0.00%

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