Selective Laser Melting of a Near-α Ti6242S Alloy for High-Performance Automotive Parts,Advanced Engineering Materials

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Selective Laser Melting of a Near-α Ti6242S Alloy for High-Performance Automotive Parts
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-12-17 , DOI: 10.1002/adem.202001194
Christian Fleißner-Rieger ₁ , Tanja Pfeifer ₂ , Tanja Jörg ₃ , Thomas Kremmer ₄ , Manfred Brabetz ₅ , Helmut Clemens ₁ , Svea Mayer ₁

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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.

中文翻译：

用于高性能汽车零件的近α Ti6242S 合金的选择性激光熔化

本研究旨在将增材制造的 Ti6242S 试样与广泛使用的 Ti64 合金进行比较，并特别关注微观结构和机械性能以及后续热处理的影响。由于 Ti6242S 合金属于近α 钛合金家族，通常在较高的使用温度下使用，因此在高达 500 °C 的室温下进行单轴拉伸试验。通过光学和电子显微镜，发现建成后的显微组织由针状α'马氏体组成，在随后的热处理过程中分解为α+β。对先前显微组织的特别关注表明，Ti6242S 合金具有较小的 β 晶粒尺寸，这影响了 β → α' 相变后所得的 α' 显微组织。此外，室温和高温下的机械性能超过了选择性激光熔化 Ti64 和传统铸造 Ti6242 材料的值。热处理后的 Ti6242S 试样的极限拉伸强度约为 1213 MPa，包括室温下 11.3% 的延展性。这些值可能有助于用近α Ti6242S 合金替代广泛使用的Ti64 合金，特别是对于高温下的高负载部件。

更新日期：2020-12-17

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