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

Open access

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.

If the inline PDF is not rendering correctly, you can download the PDF file here.

  • [1] Strondl A. Palm M. Gnauk J. Frommeyer G.: Mater. Sci. Technol. vol. 27 2011 no. 5 p. 876

  • [2] Chlebus E. Gruber K. Kuznicka B. Kurzac J. Kurzynowski T.: Mater. Sci. Eng. A vol. 639 2015 p. 647

  • [3] Ma X. Duan Z. Shi H. Murai R. Yanagisawa E.: J. Zhejiang Univ. A vol. 11 2010 no. 10 p. 727

  • [4] Ardila LC. Garciandia F. González-Díaz JB. Álvarez P. Echeverria A. Petite MM. Deffley R. Ochoa J.: Phys. Procedia C vol. 56 2014 p. 99

  • [5] Dehoff RR. Kirka MM. Sames WJ. Bilheux H. Tremsin AS. Lowe LE. Babu SS.: Mater. Sci. Technol. vol. 31 2015 no. 8 p. 931

  • [6] Denda T. Bretz PL. Tien JK.: Metall. Trans. A vol. 23 1992 no. 2 p. 519

  • [7] Riemer A. Leuders S. Thöne M. Richard HA. Tröster T. Niendorf T.: Eng. Fract. Mech. vol. 120 2014 p. 15

  • [8] Deng D. Moverare J. Peng RL. Söderberg H.: Mater. Sci. Eng. A vol. 693 2017 p. 151

  • [9] Sames V. William James: Additive manufacturing of Inconel 718 using electron beam melting: Processing post-processing & mechanical properties 2015 p. 340

  • [10] Gruber H. Hryha E. Nyborg L.: Alloy 718 powder degradation during multi-cycle EBM processing. In manuscript

  • [11] Krewerth D. Lippmann T. Weidner A. Biermann H.: Int. J. Fatigue vol. 84 2016 p. 40

  • [12] Matz JE. Eagar TW.: Metall. Mater. Trans. A vol. 33 2002 no. 8 p. 2559

Search
Journal information
Cited By
Metrics
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 611 421 18
PDF Downloads 388 243 14