Abstract
Powder Bed Fusion with Laser Beam of Metals (PBF-LB/M) is one of the fastest growing technology branches. More and more metallic alloys are being qualified, but processing of aluminum wrought alloys without cracks and defects is still challenging. It has already been shown that small parts with low residual porosity can be produced. However, suffering from microscopic hot cracks, the fracture behavior has been rather brittle. In this paper different combinations of temperature gradients and solidification rates are used to achieve specific solidification conditions in order to influence the resulting microstructure, as well as internal stresses. By this approach it could be shown that EN AW-2024, an aluminum-copper wrought alloy, is processable via PBF-LB/M fully dense and crack-free with outstanding material properties, exceeding those reported for commonly manufactured EN AW-2024 after T4 heat treatment.
Highlights
Modern additive manufacturing (AM) has its origin in the invention of the first stereolithography machine by Charles W
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Cellular and almost complete globular grain structure could be obtained by varying the process parameters without changing the alloy composition or adding grain refiners
Summary
Modern additive manufacturing (AM) has its origin in the invention of the first stereolithography machine by Charles W. Hull in 1984 [1]. Since AM has drawn increasing interest of both science and industry [2]. New technologies for the processing of polymeric and metallic materials were developed. The most important process for additive manufacturing of metals is currently powder bed fusion with laser beam [3] abbreviated as (PBF-LB), according to the nomenclature given in DIN. EN ISO/ASTM 52900 [4]. Several alternative terms are being used for naming this process due to the past lack of international standardization.
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