Effect of Selective Laser Melting Process Parameters and Heat Treatment on Microstructure and Properties of Titanium Alloys Produced from Elemental Powders

2019 ◽  
Vol 822 ◽  
pp. 549-555
Author(s):  
Igor A. Polozov ◽  
Evgenii Borisov ◽  
Vera Popovich
Keyword(s):  
Heat Treatment ◽  
Energy Density ◽  
Selective Laser Melting ◽  
Powder Mixture ◽  
Melting Process ◽  
Laser Melting ◽  
Before And After ◽  
Volume Energy ◽  
Elemental Powder Mixture

This work investigates the Selective Laser Melting (SLM) process for the in-situ synthesis of Ti-5Al and Ti-6Al-4V alloys using elemental powder mixture. Elemental spherical powders were used to prepare a powder mixture and then samples were produced by SLM using different volume energy density. The effects of volume energy density during SLM on samples’ relative density, chemical composition, microstructure and microhardness before and after heat treatment have been studied. It was shown that volume energy density during the SLM process significantly effects the density, microstructure of Ti-5Al and Ti-6Al-4V alloys, as well as, the microhardness of Ti-6Al-4V obtained from elemental powders.

Investigation of Ti-6Al-4V Alloy In Situ Manufactured Using Selective Laser Melting from Elemental Powder Mixture

2020 ◽  
Vol 299 ◽  
pp. 646-651
Author(s):  
Igor Polozov ◽  
Vadim Sufiiarov ◽  
Anatoliy Popovich
Keyword(s):  
Heat Treatment ◽  
Selective Laser Melting ◽  
Process Parameters ◽  
Powder Mixture ◽  
Elemental Powder ◽  
Laser Melting ◽  
Before And After ◽  
Elemental Powder Mixture ◽  
The Difference

This paper presents the results of the study of Selective Laser Melting (SLM) process for the in-situ synthesis of Ti-6Al-4V alloy from elemental powder mixture. Elemental spherical powders of Ti, Al and V were used to prepare a powder mixture, and then bulk specimens were produced by SLM using different process parameters. The effects of SLM process parameters on samples’ relative density, their chemical composition, the formed microstructure and microhardness before and after heat treatment have been studied. It was shown that volume energy density during the SLM process significantly effects the microstructure and microhardness of Ti-6Al-4V obtained from elemental powders. The difference in microstructure morphology and microhardness remains after heat treatment.

scholarly journals Effect of Heat Treatment on Microstructure and Impact Toughness of Ti-6Al-4V Manufactured by Selective Laser Melting Process

2017 ◽  
Vol 62 (2) ◽  
pp. 1341-1346 ◽  
Author(s):  
K.-A. Lee ◽  
Y.-K. Kim ◽  
J.-H. Yu ◽  
S.-H. Park ◽  
M.-C. Kim
Keyword(s):  
Heat Treatment ◽  
Impact Toughness ◽  
Selective Laser Melting ◽  
Impact Energy ◽  
Charpy Impact ◽  
Melting Process ◽  
Laser Melting ◽  
Average Impact ◽  
Before And After ◽  
The Impact

AbstractThis study manufactured Ti-6Al-4V alloy using one of the powder bed fusion 3D-printing processes, selective laser melting, and investigated the effect of heat treatment (650°C/3hrs) on microstructure and impact toughness of the material. Initial microstructural observation identified prior-βgrain along the building direction before and after heat treatment. In addition, the material formed a fully martensite structure before heat treatment, and after heat treatment,αandβphase were formed simultaneously. Charpy impact tests were conducted. The average impact energy measured as 6.0 J before heat treatment, and after heat treatment, the average impact energy increased by approximately 20% to 7.3 J. Fracture surface observation after the impact test showed that both alloys had brittle characteristics on macro levels, but showed ductile fracture characteristics and dimples at micro levels.

Microstructure and texture evolution during the manufacturing of in situ TiC-NiCr cermet through selective laser melting process

2021 ◽  
pp. 111289
Author(s):  
Atefeh Aramian ◽  
Zohreh Sadeghian ◽  
Di Wan ◽  
Yaroslav Holovenko ◽  
Seyed Mohammad Javad Razavi ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Texture Evolution ◽  
Melting Process ◽  
Laser Melting ◽  
Selective Laser Melting Process ◽  
In Situ Tic

scholarly journals Mechanical Properties of In-Situ Synthesis of Ti-Ti3Al Metal Composite Prepared by Selective Laser Melting

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1121 ◽  
Author(s):  
Li ◽  
Liang ◽  
Tian ◽  
Yang ◽  
Xie ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Selective Laser Melting ◽  
Melting Process ◽  
In Situ Synthesis ◽  
Metal Composite ◽  
Dispersion Strengthening ◽  
Laser Melting ◽  
Compression Properties

Titanium composite strengthened by Ti3Al precipitations is considered to be one of the excellent materials that is widely used in engineering. In this work, we prepared a kind of Ti-Ti3Al metallic composite by in-situ synthesis technology during the SLM (selective laser melting) process, and analyzed its microstructure, wear resistance, microhardness, and compression properties. The results showed that the Ti-Ti3Al composite, prepared by in-situ synthesis technology based on SLM, had more homogeneous Ti3Al-enhanced phase dispersion strengthening structure. The grain size of the workpiece was about 1 μm, and that of the Ti3Al particle was about 200 nm. Granular Ti3Al was precipitated after the aluminum-containing workpiece formed, with a relatively uniform distribution. Regarding the mechanical properties, the hardness (539 HV) and the wear resistance were significantly improved when compared with the Cp-Ti workpiece. The compressive strength of the workpiece increased from 886.32 MPa to 1568 MPa, and the tensile strength of the workpiece increased from 531 MPa to 567 MPa after adding aluminum. In the future, the combination of in-situ synthesis technology and SLM technology can be used to flexibly adjust the properties of Ti-based materials.

Water Atomized 17-4 PH Stainless Steel Powder as a Cheaper Alternative Powder Feedstock for Selective Laser Melting

2018 ◽  
Vol 941 ◽  
pp. 698-703 ◽  
Author(s):  
Milad Ghayoor ◽  
Sunil B. Badwe ◽  
Harish Irrinki ◽  
Sundar V. Atre ◽  
Somayeh Pasebani
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Stainless Steel ◽  
Selective Laser Melting ◽  
Steel Powder ◽  
Melting Process ◽  
Stainless Steel Powder ◽  
Laser Melting ◽  
Austenitic Phase ◽  
Process Gas

Water atomized and gas atomized 17-4 PH stainless steel powder were used as feedstock in selective laser melting process. Gas atomized powder revealed single martensitic phase after printing and heat treatment. As-printed water atomized powder contained dual martensitic and austenitic phase. The H900 heat treatment cycle was not effective in enhancing mechanical properties of the water atomized powder after laser melting. However, after solutionizing at 1315 oC and aging at 482oC fully martensitic structure was observed with yield strength of 1000 MPa and ultimate tensile strength of 1261 MPa which are comparable to those of gas atomized, 1254 MPa and 1300 MPa, respectively. Improved mechanical properties in water atomized powder was found to be related to presence of finer martensite. Our results imply that water atomized powder is a promising cheaper feedstock alternative to gas atomized powder.

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