Abstract
Elemental segregation behavior was examined in the as-solidified microstructures of six directionally-solidified MAR-M247-derivative alloys with variations in the C, Hf, and Ta levels. Elemental segregation patterns were determined from elemental contour maps of dendritic cross-sections generated from electron microprobe data. Hf, Ta, Ti, and Al were found to segregate to the liquid, W and Co segregated to the solid, and MO, Cr, and Ni did not segregate consistently to one phase during solidification. Initial distribution coefficients were calculated as the ratio of dendrite core composition to bulk alloy composition. Average distribution coefficients were determined from constructed solid composition profiles as a function of fraction solidified using a Scheil-type analysis. The distribution coefficients did not vary between the six alloys for a given element; mean values of the average distribution coefficients were found to be 0.12 for Hf, 0.77 for Ta, 0.73 for Ti, 0.94 for Al, 1.23 for W, and 1.07 for Co. Superalloys 1992 Edited by S.D. Antolovich, R.W. Stusrud, R.A. MacKay, D.L. Anton, T. Khan, R.D. Kissinger, D.L. Klarstrom The Minerals, Metals & Materials Society, 1992
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
