研究目的
To investigate the correlations between processing conditions (i.e., laser energy density, building direction) and heat treatment on fracture toughness of AISI H13 tool steel additively manufactured by laser powder bed fusion.
研究成果
The study concludes that the fracture toughness of L-PBF fabricated AISI H13 tool steel is influenced by the building direction and heat treatment. Samples with the notch parallel to the building direction showed the highest fracture toughness. Tempering only (T) samples exhibited higher fracture toughness compared to quenched and tempered (QT) ones, attributed to more pronounced precipitation of carbides and a finer microstructure.
研究不足
The study is limited by the experimental conditions such as the range of laser energy densities used and the specific heat treatment parameters. The findings may not be generalizable to other materials or processing conditions.
1：Experimental Design and Method Selection:
The study involved the fabrication of AISI H13 tool steel samples using laser powder bed fusion (L-PBF) with varying laser energy densities and building directions. The samples were subjected to two different heat treatments: quenching and tempering (QT) and only tempering (T).
2：Sample Selection and Data Sources:
Samples were produced from spherical gas atomized AISI H13 powders and processed with the MCP HEK REALIZER II, L-PBF machine using a Nd:YAG laser source.
3：List of Experimental Equipment and Materials:
MCP HEK REALIZER II L-PBF machine, Nd:YAG laser source, AISI H13 powders.
4：Experimental Procedures and Operational Workflow:
The samples were heat treated under vacuum, with quenching carried out at 1020 °C followed by tempering. Fracture toughness was measured using the single-edge-notch bending (SENB) testing geometry.
5：Data Analysis Methods:
Microstructural analysis was performed using light optical microscopy, scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD). Fracture toughness was determined from the SENB tests.
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