期刊
JOM
卷 68, 期 3, 页码 1012-1020出版社
SPRINGER
DOI: 10.1007/s11837-016-1812-6
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资金
- US Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office [DE-AC05-00OR22725]
- UT-Battelle, LLC
During the electron beam melting (EBM) process, builds occur at temperatures in excess of 800A degrees C for nickel-base superalloys such as Inconel 718. When coupled with the temporal differences between the start and end of a build, a top-to-bottom microstructure gradient forms. Characterized in this study is a microstructure gradient and associated tensile property gradient common to all EBM Inconel 718 builds, the extent of which is dependent on build geometry and the specifics of a build's processing history. From the characteristic microstructure elements observed in EBM Inconel 718 material, the microstructure gradient can be classified into three distinct regions. Region 1 (top of a build) is comprised of a cored dendritic structure that includes carbides and Laves phase within the interdendritic regions. Region 2 is an intermediate transition zone characterized by a diffuse dendritic structure, dissolution of the Laves phase, and precipitation of needle networks within the interdendritic regions. The bulk structure (Region 3) is comprised of a columnar grain structure lacking dendritic characteristics with networks having precipitated within the grain interiors. Mechanically, at both 20A degrees C and 650A degrees C, the yield strength, ultimate tensile strength, and elongation at failure exhibit the general trend of increasing with increasing build height.
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