Creep properties of single crystal Ni-base superalloys (SX): A comparison between conventionally cast and additive manufactured CMSX-4 materials

The present work compares the microstructures and the creep properties of two types of single crystal Ni-base superalloy CMSX-4 materials (SXs). One was produced by conventional directional solidification Bridgman processing. The other was manufactured by selective electron beam melting (SEBM). The...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-08, Vol.762, p.138098, Article 138098
Hauptverfasser: Bürger, D., Parsa, A.B., Ramsperger, M., Körner, C., Eggeler, G.
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container_start_page 138098
container_title Materials science & engineering. A, Structural materials : properties, microstructure and processing
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creator Bürger, D.
Parsa, A.B.
Ramsperger, M.
Körner, C.
Eggeler, G.
description The present work compares the microstructures and the creep properties of two types of single crystal Ni-base superalloy CMSX-4 materials (SXs). One was produced by conventional directional solidification Bridgman processing. The other was manufactured by selective electron beam melting (SEBM). The microstructures of the two types of materials are compared with emphasis placed on the large (dendritic/interdendritic regions) and small scale (γ-matrix/γ′-precipitates) microstructural heterogeneities, which characterize SX microstructures and their evolution during processing, heat treatment and creep. It is shown that heat treated SEBM materials have creep properties, which match or even outperform those of conventionally processed SX materials. Creep properties were assessed using a miniature creep test technique where [001] miniature tensile creep specimens were tested in the high temperature/low stress (1050 °C, 160 MPa) and in the low temperature/high stress (850 °C, 600 MPa) creep regimes. The creep behavior is interpreted based on microstructural results, which were obtained using analytical scanning and transmission electron microscopy (SEM and TEM).
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source ScienceDirect Journals (5 years ago - present)
subjects Additive manufactured single crystal
Bridgman method
Creep
Creep tests
Crystal growth
Directional solidification
Directionally solidified single crystals
Electron beam melting
Heat treating
Heat treatment
High temperature
Microstructure
Ni-base single crystal superalloys
Nickel base alloys
Precipitates
Properties (attributes)
Single crystals
Superalloys
Tensile creep
title Creep properties of single crystal Ni-base superalloys (SX): A comparison between conventionally cast and additive manufactured CMSX-4 materials
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