The collection of files in this curation contains a series of thermophysical, diffraction, and electron microscopy data describing the microstructure of two cobalt-based superalloys. The data intends to show how the oxidation properties of the two alloys can be manipulated by applying a heat treatment to redistribute phases in the microstructure that are sensitive to oxidation and corrosion processes.

F1. A collection of back scattered electron images of the typical microstructures found in the alloy Co-101. These were obtained by scanning electron microscopy using a GeminiSEM 300 (Carl Zeiss Microscopy, Jena, Thuringia, Germany) scanning electron microscope (SEM). Additional energy dispersive X-ray spectroscopy maps of a key area of the microstructure are included for Co, Cr, Ni, Mo, C, Si, and Mn.

F2. X-ray diffraction data for the phases in the as-cast Co-101 microstructure between 20-100 2-theta collected using a D8 ADVANCE Davinci instrument (Bruker, Billerica, MA, US) fitted with a LynxEye EX position sensitive detector.

F3. Transmission electron microscopy data for as-cast Co-101 obtained using an TALOS F200X (FEI™, Thermo Fisher Scientific, Hillsboro, OR, US). Bright field images with corresponding scanning transmission electron microscopy (STEM) energy dispersive X-ray spectroscopy (EDX) maps for Co, Cr, Ni, Mo, Fe, Si, and C. Additionally, selected area diffraction patterns for key phases in Co-101 are shown in F3.

F4. Differential scanning calorimetry curves for as-cast and solution heat-treated Co-101 obtained using a Netzsch 404 calorimeter (NETZSCH-Gerätebau GmbH, Selb, Bavaria, Germany) showing the key phase transformations that occur in the two specimens.

F5. Scanning electron microscopy backscattered images of the microstructure of Co-101 after being solution heat treated at 1250˚C for 10 hours obtained using a GeminiSEM 300 (Carl Zeiss Microscopy, Jena, Thuringia, Germany).

F6. Scanning electron backscatter micrographs showing the differences between the surface cross sections of oxidised, a) as-cast, and b), solution heat-treated Co-101 material. Corresponding EDX maps of the cross sections are shown for Co, Cr, Ni, Mo, Si, and O. These images were obtained using a GeminiSEM 300 (Carl Zeiss Microscopy, Jena, Thuringia, Germany).

F7. Scanning electron backscatter images of the precipitation of carbides in the bulk microstructure after oxidation in the a) as-cast and b) the solution heat-treated Co-101 alloys. These images were obtained using a GeminiSEM 300 (Carl Zeiss Microscopy, Jena, Thuringia, Germany).

F8. Scanning electron backscatter micrographs of as-cast Stellite 21 alloy obtained using a GeminiSEM 300 (Carl Zeiss Microscopy, Jena, Thuringia, Germany).

F9. Transmission electron microscopy data for as-cast Stellite 21 obtained using an TALOS F200X (FEI™, Thermo Fisher Scientific, Hillsboro, OR, US). Bright field images with corresponding scanning transmission electron microscopy energy dispersive X-ray spectroscopy (EDX) maps for Co, Cr, Ni, Mo, and Fe. Additionally, selected area diffraction patterns (SADP) for key phases in Stellite 21 are shown in F9.

F10. Differential scanning calorimetry curves for as-cast Stellite 21 obtained using a Netzsch 404 calorimeter (NETZSCH-Gerätebau GmbH, Selb, Bavaria, Germany) showing the key phase transformations that occur at high temperatures.

F11. Scanning electron backscatter (BSE) images of the 1250˚C 10-hour solution heat-treated Stellite 21 obtained using a GeminiSEM 300 (Carl Zeiss Microscopy, Jena, Thuringia, Germany).

F12. Scanning electron backscatter (BSE) micrographs obtained using a GeminiSEM 300 (Carl Zeiss Microscopy, Jena, Thuringia, Germany) showing the differences between the surface cross sections of oxidised, a) as-cast, and b), solution heat-treated Stellite 21 material. Corresponding EDX maps of the cross sections are shown for Co, Cr, Ni, Mo, Si, and O.

F13. Scanning electron backscatter images of the precipitation of in the bulk microstructure after oxidation in the a) as-cast and b) the solution heat-treated Stellite 21 alloys. These images were obtained using a GeminiSEM 300 (Carl Zeiss Microscopy, Jena, Thuringia, Germany).

The reader is referred to the associated publication for more details about the experimental methods and data interpretation.