Journal article
(Original article)


Grain structure evolution in Inconel 718 during selective electron beam melting


Publication Details
Author(s): Helmer HE, Bauereiß A, Singer R, Körner C
Publisher: Elsevier Ltd
Publication year: 2016
Volume: 668
Pages range: 180-187
ISSN: 0921-5093
Language: English

Abstract

Selective electron beam melting (SEBM) is an additive manufacturing method where complex parts are built from metal powders in layers of typically 50 μm. An electron beam is used for heating (about 900 °C building temperature) and selective melting of the material. The grain structure evolution is a result of the complex thermal and hydrodynamic conditions in the melt pool. We show how different scanning strategies can be used to produce either a columnar grain structure with a high texture in building direction or an equiaxed fine grained structure. Numerical simulations of the selective melting process are applied to study the fundamental mechanisms responsible for differing grain structures. It is shown, that the direction of the thermal gradient during solidification can be altered by scanning strategies to acquire either epitaxial growth or stray grains. We show that it is possible to locally alter the grain structure of a part, thus allowing tailoring of the mechanical properties.



How to cite
APA: Helmer, H.E., Bauereiß, A., Singer, R., & Körner, C. (2016). Grain structure evolution in Inconel 718 during selective electron beam melting. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 668, 180-187. https://dx.doi.org/10.1016/j.msea.2016.05.046

MLA: Helmer, Harald Ernst, et al. "Grain structure evolution in Inconel 718 during selective electron beam melting." Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing 668 (2016): 180-187.

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