Tensile behavior of Ti-6Al-4V alloy fabricated by selective laser melting: effects of microstructures and as-built surface quality
Selective laser melting (SLM) is a powerful additive manufacturing (AM) technology, of which the most prominent advantage is the ability to produce components with a complex geometry. The service performances of the SLM-processed components depend on the microstructure and surface quality. In this...
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| Format: | Article |
| Language: | English |
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Foundry Journal Agency
2018-07-01
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| Series: | China Foundry |
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| Online Access: | http://ff.foundryworld.com/uploadfile/2018081333714337.pdf |
| _version_ | 1818905116836626432 |
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| author | Pan Tao Huai-xue Li Bai-ying Huang |
| author_facet | Pan Tao Huai-xue Li Bai-ying Huang |
| author_sort | Pan Tao |
| collection | DOAJ |
| description | Selective laser melting (SLM) is a powerful additive manufacturing (AM) technology, of which the most
prominent advantage is the ability to produce components with a complex geometry. The service performances of
the SLM-processed components depend on the microstructure and surface quality. In this work, the microstructures,
mechanical properties, and fracture behaviors of SLM-processed Ti-6Al-4V alloy under machined and as-built
surfaces after annealing treatments and hot isostatic pressing (HIP) were investigated. The microstructures were
analyzed by optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscopy
(TEM). The mechanical properties were measured by tensile testing at room temperature. The results indicate
that the as-deposited microstructures are characterized by columnar grains and fi ne brittle martensite and the asdeposited
properties present high strength, low ductility and obvious anisotropy. After annealing at 800-900°C
for 2-4 h and HIP at 920°C/100MPa for 2 h, the brittle martensite could be transformed into ductile lamellar (α+β)
microstructure and the static tensile properties of SLM-processed Ti-6Al-4V alloys in the machined condition could
be comparable to that of wrought materials. Even after HIP treatment, the as-built surfaces could decrease the
ductility and reduction of area of SLM-processed Ti-6Al-4V alloys to 9.2% and 20%, respectively. The crack initiation
could occur at the columnar grain boundaries or at the as-built surfaces. The lamellar (α+β) microstructures and
columnar grains could hinder or distort the crack propagation path during tensile tests. |
| first_indexed | 2024-12-19T21:18:13Z |
| format | Article |
| id | doaj.art-1bfe18d3cc174b9f922adc1a455da591 |
| institution | Directory Open Access Journal |
| issn | 1672-6421 1672-6421 |
| language | English |
| last_indexed | 2024-12-19T21:18:13Z |
| publishDate | 2018-07-01 |
| publisher | Foundry Journal Agency |
| record_format | Article |
| series | China Foundry |
| spelling | doaj.art-1bfe18d3cc174b9f922adc1a455da5912022-12-21T20:05:18ZengFoundry Journal AgencyChina Foundry1672-64211672-64212018-07-0115424325210.1007/s41230-018-8064-8Tensile behavior of Ti-6Al-4V alloy fabricated by selective laser melting: effects of microstructures and as-built surface qualityPan Tao0Huai-xue Li 1Bai-ying Huang 21. Key Laboratory for Advanced Materials Processing Technology (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; 2. Science and Technology on Power Beam Processes Laboratory, AVIC Manufacturing Technology Institute, Beijing 100024, China; 3. Key Laboratory of Aeronautical Technology on additive manufacturing, AVIC Manufacturing Technology Institute, Beijing 100024, China2. Science and Technology on Power Beam Processes Laboratory, AVIC Manufacturing Technology Institute, Beijing 100024, China; 3. Key Laboratory of Aeronautical Technology on additive manufacturing, AVIC Manufacturing Technology Institute, Beijing 100024, China2. Science and Technology on Power Beam Processes Laboratory, AVIC Manufacturing Technology Institute, Beijing 100024, China; 3. Key Laboratory of Aeronautical Technology on additive manufacturing, AVIC Manufacturing Technology Institute, Beijing 100024, ChinaSelective laser melting (SLM) is a powerful additive manufacturing (AM) technology, of which the most prominent advantage is the ability to produce components with a complex geometry. The service performances of the SLM-processed components depend on the microstructure and surface quality. In this work, the microstructures, mechanical properties, and fracture behaviors of SLM-processed Ti-6Al-4V alloy under machined and as-built surfaces after annealing treatments and hot isostatic pressing (HIP) were investigated. The microstructures were analyzed by optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The mechanical properties were measured by tensile testing at room temperature. The results indicate that the as-deposited microstructures are characterized by columnar grains and fi ne brittle martensite and the asdeposited properties present high strength, low ductility and obvious anisotropy. After annealing at 800-900°C for 2-4 h and HIP at 920°C/100MPa for 2 h, the brittle martensite could be transformed into ductile lamellar (α+β) microstructure and the static tensile properties of SLM-processed Ti-6Al-4V alloys in the machined condition could be comparable to that of wrought materials. Even after HIP treatment, the as-built surfaces could decrease the ductility and reduction of area of SLM-processed Ti-6Al-4V alloys to 9.2% and 20%, respectively. The crack initiation could occur at the columnar grain boundaries or at the as-built surfaces. The lamellar (α+β) microstructures and columnar grains could hinder or distort the crack propagation path during tensile tests.http://ff.foundryworld.com/uploadfile/2018081333714337.pdfselective laser meltingTi-6Al-4Vmicrostructuremechanical propertiesfracturesurface quality |
| spellingShingle | Pan Tao Huai-xue Li Bai-ying Huang Tensile behavior of Ti-6Al-4V alloy fabricated by selective laser melting: effects of microstructures and as-built surface quality China Foundry selective laser melting Ti-6Al-4V microstructure mechanical properties fracture surface quality |
| title | Tensile behavior of Ti-6Al-4V alloy fabricated by selective laser melting: effects of microstructures and as-built surface quality |
| title_full | Tensile behavior of Ti-6Al-4V alloy fabricated by selective laser melting: effects of microstructures and as-built surface quality |
| title_fullStr | Tensile behavior of Ti-6Al-4V alloy fabricated by selective laser melting: effects of microstructures and as-built surface quality |
| title_full_unstemmed | Tensile behavior of Ti-6Al-4V alloy fabricated by selective laser melting: effects of microstructures and as-built surface quality |
| title_short | Tensile behavior of Ti-6Al-4V alloy fabricated by selective laser melting: effects of microstructures and as-built surface quality |
| title_sort | tensile behavior of ti 6al 4v alloy fabricated by selective laser melting effects of microstructures and as built surface quality |
| topic | selective laser melting Ti-6Al-4V microstructure mechanical properties fracture surface quality |
| url | http://ff.foundryworld.com/uploadfile/2018081333714337.pdf |
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