Selective Laser Melting of a Near-alpha Ti6242S Alloy for High-Performance Automotive Parts
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in: Advanced engineering materials, Jahrgang 2021, 17.12.2020, S. 1-12.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - Selective Laser Melting of a Near-alpha Ti6242S Alloy for High-Performance Automotive Parts
AU - Fleißner-Rieger, Christian
AU - Pfeifer, Tanja
AU - Jörg, Tanja
AU - Kremmer, Thomas
AU - Brabetz, Manfred
AU - Clemens, Helmut
AU - Mayer, Svea
PY - 2020/12/17
Y1 - 2020/12/17
N2 - This study aims to investigate additively manufactured Ti6242S specimens compared with the widely used Ti64 alloy with a special focus on microstructure and mechanical properties as well as the impact of subsequent heat treatments. As the Ti6242S alloy, which belongs to the family of near-α Ti-alloys, is often used at higher service temperatures, uniaxial tensile tests are performed at a room temperature up to 500 °C. By means of optical and electron microscopy, it is found that the as-built microstructure consists of acicular α′ martensite, which decomposes to α + β during the subsequent heat treatment. A special focus on the prior microstructure shows that the Ti6242S alloy has a small β grain size, which influences the resulting α′ microstructure after the β → α′ phase transformation. Furthermore, the mechanical properties at room temperature as well as elevated temperatures exceed the values for selective laser melted Ti64 and conventionally cast Ti6242 material. The heat-treated Ti6242S specimens exhibit an ultimate tensile strength of about 1213 MPa including a ductility of 11.3% at room temperature. These values may path the way to a substitution of the widely used Ti64 alloy by the near-α Ti6242S alloy, especially for highly loaded components at elevated temperatures.
AB - This study aims to investigate additively manufactured Ti6242S specimens compared with the widely used Ti64 alloy with a special focus on microstructure and mechanical properties as well as the impact of subsequent heat treatments. As the Ti6242S alloy, which belongs to the family of near-α Ti-alloys, is often used at higher service temperatures, uniaxial tensile tests are performed at a room temperature up to 500 °C. By means of optical and electron microscopy, it is found that the as-built microstructure consists of acicular α′ martensite, which decomposes to α + β during the subsequent heat treatment. A special focus on the prior microstructure shows that the Ti6242S alloy has a small β grain size, which influences the resulting α′ microstructure after the β → α′ phase transformation. Furthermore, the mechanical properties at room temperature as well as elevated temperatures exceed the values for selective laser melted Ti64 and conventionally cast Ti6242 material. The heat-treated Ti6242S specimens exhibit an ultimate tensile strength of about 1213 MPa including a ductility of 11.3% at room temperature. These values may path the way to a substitution of the widely used Ti64 alloy by the near-α Ti6242S alloy, especially for highly loaded components at elevated temperatures.
UR - http://www.scopus.com/inward/record.url?scp=85099406085&partnerID=8YFLogxK
U2 - 10.1002/adem.202001194
DO - 10.1002/adem.202001194
M3 - Article
VL - 2021
SP - 1
EP - 12
JO - Advanced engineering materials
JF - Advanced engineering materials
SN - 1438-1656
ER -