Measurement of segregation and distribution coefficients in MAR-M200 and hafnium-modified MAR-M200 superalloys View Full Text


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Article Info

DATE

1986-03

AUTHORS

R. Sellamuthu, A. F. Giamei

ABSTRACT

Crystals of the MAR-M200* and the Hf-modified MAR-M200 superalloys were grown by plane front solidification. The solidification microstructures of both alloys contain the proeutectic γ phase, the γ + γ’ eutectic, and a 3-phase eutectic. The chemical compositions of these alloys were measured along the growth direction with the use of an electron microprobe. In the MAR-M200 alloy, W preferentially segregates to the proeutectic while Ti, Cr, and Al preferentially segregate to the eutectic. In the Hf-modified MAR-M200 alloy, W, Cr, and Al preferentially segregate to the proeutectic while Ti and Hf preferentially segregate to the eutectic. The segregation trends observed in the plane front solidified alloys are generally in agreement with the results reported in the literature for the dendritically solidified alloys. The distribution coefficients determined from the composition data range from 1.1 to 1.3 for W, 0.5 to 0.7 for Ti, 0.85 to 0.95 for Al, and 0.9 to 0.95 for Cr in the MAR-M200 alloy, and from 1.1 to 3.7 for W, 0.8 to 1.2 for Ti, 0.95 to 1.2 for Al, and 0.17 to 0.29 for Hf in the Hf-modified MAR-M200 alloy. More... »

PAGES

419-428

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Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02643948

DOI

http://dx.doi.org/10.1007/bf02643948

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1043985871


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