期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.11.001
关键词
Additive manufacturing; Laser powder bed fusion; Heat-treatment; AISI H11 1.2343; Microstructure; Tensile strength
类别
资金
- German Research Foundation (DFG), Germany [CRC 814, 61375930]
- German Research Foundation (DFG), Germany [Erlangen Graduate School in Advanced Optical Technologies (SAOT)]
- Bayerische Forschungsstiftung, Germany
- Ministry of Education and Science of the Russian Federation, Russia [Decree N220, 14.250.31.0023]
Laser Beam Melting (LBM) of metals is an innovative additive manufacturing technology for producing complexly shaped parts. However, the spectrum of available materials is yet limited and the qualification of further alloys is subject of ongoing research. Considering tooling applications e.g. for injection moulding low alloyed tool steels like 1.2343 (AISI H11) would be of particular interest. The feasibility of processing 1.2343 by LBM has already been shown. Besides the LBM-process itself, also a heat-treatment process has to be taken into account. Heat-treatment is necessary to reduce the process-inherent internal stress and to adjust the desired mechanical properties. Hence, an experimental study on the heat-treatment of laser beam molten specimens made from 1.2343 is conducted. The resulting microstructure is characterised by metallographic microsections and electron backscatter diffraction (EBSD). Additionally, hardness measurements and tensile tests give information about the mechanical properties in dependence of the build direction and the heat-treatment strategy. The ultimate tensile strength after annealing reached 2148 +/- 16 MPa along with an elongation at break of 8.8 +/- 1.1 %. The hardness of the LBM-generated material was determined to 737 +/- 16 HVI after hardening and to 585 +/- 9 HVI after annealing.
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