Powder metal disk with selective fatigue strengthening

Details Powder metal disk with selective fatigue strengthening Powder metal disk with selective fatigue strengthening

1983-06-13

1987-05-05

Nelson, Peter A.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

428567, 428579, B22F 326

Patent

active

046632417

ABSTRACT:
Disclosed is a gas turbine disk made from powder metal, wherein the bore has improved fatigue life compared to conventional articles because the bore is formed from a fine fraction of powder separated from a lot of conventional powder metal suitable for hot isostatic compaction. The outer and rim portions of the disk, which are less prone to fatigue failure, are made from the remainder of the lot but nonetheless have no more limited performance from that resulting when a unitary unseparated powder lot is used. Improved bore fatigue properties result because the coarse fatigue failure-causing nonmetallic inclusions are biased into the outer portions of the disk where they do not have adverse effect.

REFERENCES:
patent: 2267918 (1941-12-01), Hildabolt
patent: 2757901 (1956-08-01), McVeigh
patent: 3780418 (1973-12-01), Hurst
patent: 3846126 (1964-11-01), Foley et al.
patent: 4054449 (1977-10-01), Dunn et al.
patent: 4062678 (1977-12-01), Dreyer et al.
patent: 4063939 (1977-12-01), Weaver et al.
patent: 4101712 (1978-07-01), Bomford et al.

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