Influence of Inherent Surface and Internal Defects on Mechanical Properties of Additively Manufactured Ti6Al4V Alloy: Comparison between Selective Laser Melting and Electron Beam Melting
Additive manufacture (AM) appears to be the most suitable technology to produce sophisticated, high quality, lightweight parts from Ti6Al4V alloy. However, the fatigue life of AM parts is of concern. In our study, we focused on a comparison of two techniques of additive manufacture—selective laser m...
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MDPI AG
2018-03-01
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| Series: | Materials |
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| Online Access: | http://www.mdpi.com/1996-1944/11/4/537 |
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| author | Michaela Fousová Dalibor Vojtěch Karel Doubrava Matěj Daniel Chiu-Feng Lin |
| author_facet | Michaela Fousová Dalibor Vojtěch Karel Doubrava Matěj Daniel Chiu-Feng Lin |
| author_sort | Michaela Fousová |
| collection | DOAJ |
| description | Additive manufacture (AM) appears to be the most suitable technology to produce sophisticated, high quality, lightweight parts from Ti6Al4V alloy. However, the fatigue life of AM parts is of concern. In our study, we focused on a comparison of two techniques of additive manufacture—selective laser melting (SLM) and electron beam melting (EBM)—in terms of the mechanical properties during both static and dynamic loading. All of the samples were untreated to focus on the influence of surface condition inherent to SLM and EBM. The EBM samples were studied in the as-built state, while SLM was followed by heat treatment. The resulting similarity of microstructures led to comparable mechanical properties in tension, but, due to differences in surface roughness and specific internal defects, the fatigue strength of the EBM samples reached only half the value of the SLM samples. Higher surface roughness that is inherent to EBM contributed to multiple initiations of fatigue cracks, while only one crack initiated on the SLM surface. Also, facets that were formed by an intergranular cleavage fracture were observed in the EBM samples. |
| first_indexed | 2024-04-12T09:05:45Z |
| format | Article |
| id | doaj.art-34dbef4391eb435e801aa2af2e1357ea |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-04-12T09:05:45Z |
| publishDate | 2018-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-34dbef4391eb435e801aa2af2e1357ea2022-12-22T03:39:06ZengMDPI AGMaterials1996-19442018-03-0111453710.3390/ma11040537ma11040537Influence of Inherent Surface and Internal Defects on Mechanical Properties of Additively Manufactured Ti6Al4V Alloy: Comparison between Selective Laser Melting and Electron Beam MeltingMichaela Fousová0Dalibor Vojtěch1Karel Doubrava2Matěj Daniel3Chiu-Feng Lin4Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague, Czech RepublicDepartment of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague, Czech RepublicDepartment of Mechanics, Biomechanics and Mechatronics, Czech Technical University in Prague, Zikova 1903, 166 36 Prague, Czech RepublicDepartment of Mechanics, Biomechanics and Mechatronics, Czech Technical University in Prague, Zikova 1903, 166 36 Prague, Czech RepublicMetal Industries Research & Development Centre, Kaonan Highway 1101, 811 60 Kaohsiung, TaiwanAdditive manufacture (AM) appears to be the most suitable technology to produce sophisticated, high quality, lightweight parts from Ti6Al4V alloy. However, the fatigue life of AM parts is of concern. In our study, we focused on a comparison of two techniques of additive manufacture—selective laser melting (SLM) and electron beam melting (EBM)—in terms of the mechanical properties during both static and dynamic loading. All of the samples were untreated to focus on the influence of surface condition inherent to SLM and EBM. The EBM samples were studied in the as-built state, while SLM was followed by heat treatment. The resulting similarity of microstructures led to comparable mechanical properties in tension, but, due to differences in surface roughness and specific internal defects, the fatigue strength of the EBM samples reached only half the value of the SLM samples. Higher surface roughness that is inherent to EBM contributed to multiple initiations of fatigue cracks, while only one crack initiated on the SLM surface. Also, facets that were formed by an intergranular cleavage fracture were observed in the EBM samples.http://www.mdpi.com/1996-1944/11/4/537Ti6Al4Vselective laser meltingelectron beam meltingmechanical propertiesfatigue |
| spellingShingle | Michaela Fousová Dalibor Vojtěch Karel Doubrava Matěj Daniel Chiu-Feng Lin Influence of Inherent Surface and Internal Defects on Mechanical Properties of Additively Manufactured Ti6Al4V Alloy: Comparison between Selective Laser Melting and Electron Beam Melting Materials Ti6Al4V selective laser melting electron beam melting mechanical properties fatigue |
| title | Influence of Inherent Surface and Internal Defects on Mechanical Properties of Additively Manufactured Ti6Al4V Alloy: Comparison between Selective Laser Melting and Electron Beam Melting |
| title_full | Influence of Inherent Surface and Internal Defects on Mechanical Properties of Additively Manufactured Ti6Al4V Alloy: Comparison between Selective Laser Melting and Electron Beam Melting |
| title_fullStr | Influence of Inherent Surface and Internal Defects on Mechanical Properties of Additively Manufactured Ti6Al4V Alloy: Comparison between Selective Laser Melting and Electron Beam Melting |
| title_full_unstemmed | Influence of Inherent Surface and Internal Defects on Mechanical Properties of Additively Manufactured Ti6Al4V Alloy: Comparison between Selective Laser Melting and Electron Beam Melting |
| title_short | Influence of Inherent Surface and Internal Defects on Mechanical Properties of Additively Manufactured Ti6Al4V Alloy: Comparison between Selective Laser Melting and Electron Beam Melting |
| title_sort | influence of inherent surface and internal defects on mechanical properties of additively manufactured ti6al4v alloy comparison between selective laser melting and electron beam melting |
| topic | Ti6Al4V selective laser melting electron beam melting mechanical properties fatigue |
| url | http://www.mdpi.com/1996-1944/11/4/537 |
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