Effect of microstructure and defect formation on the bending properties of additive manufactured H13 tool steel
| Autor: | Claudemiro Bolfarini, Reginaldo Teixeira Coelho, Bianca C.A. Felipe, Luiz H.Q.R. Lima, Adriel P. Oliveira, Piter Gargarella |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Austenite
Mining engineering. Metallurgy Materials science Additive manufacturing H13 Tool steel TN1-997 Metals and Alloys engineering.material Microstructure Die casting Forging Surfaces Coatings and Films Biomaterials Fracture toughness Bending properties Powder bed fusion Ultimate tensile strength Ceramics and Composites engineering Tempering Composite material ENGENHARIA DE PRODUÇÃO |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Journal of Materials Research and Technology, Vol 15, Iss, Pp 3598-3609 (2021) |
| ISSN: | 2238-7854 |
| DOI: | 10.1016/j.jmrt.2021.10.011 |
| Popis: | Due to its high strength and wear resistance and good fracture toughness at low and high temperatures, AISI H13 tool steel has been widely used to fabricate components such as injection molds, die casting dies, and hot forging tools. Components with complex geometries can be produced by additive manufacturing (AM); however, the success of this manufacture depends on the formed microstructure and mechanical properties, which are associated with the process parameters. The mechanical properties of H13 tool steel processed by AM reported in the literature are limited to those obtained through hardness and tensile tests. Thus, this study aims to correlate the bending properties of H13 tool steel with its microstructure and process parameters when processed by the Powder Bed Fusion (PBF) technique. The samples were produced with different energy densities (approximately 200, 400, and 600 J/mm³) and analyzed by XRD, OM, SEM, and ACOM-TEM. The amount of retained austenite in the cellular microstructure and the porosity decreased as the energy density increased. The sample manufactured with 400 J/mm³ presented the highest density and bending stress values. In contrast, the sample produced with 600 J/mm³ showed a smaller number of defects and more extensive deformation before fracture. This behavior was explained considering the fraction of retained austenite, intrinsic tempering, and presence of defects. The fracture mechanism comprised a mixture of cleavage and dimple formation. This study demonstrates that the bending properties of H13 tool steel processed by PBF are directly related to the resulting microstructure and process parameters used to fabricate the parts. |
| Databáze: | OpenAIRE |
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