Hardmetal facing for rolling cutter drill bit

Details Hardmetal facing for rolling cutter drill bit Hardmetal facing for rolling cutter drill bit

1995-11-17

1997-08-05

Bagnell, David J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

75240, E21B 1050

Patent

active

056532997

ABSTRACT:
A steel tooth rolling cutter earth boring drill bit comprises a bit body with a threaded upper end for attachment to the end of a drill string, and a lower end comprising three legs extending downwardly from the bit body and with a rolling cutter rotatably mounted on each leg. A layer of wear resistant material is applied to a portion of each rolling cutter and comprises were resistant particles in a substantially steel matrix. The steel matrix is integrally formed with the cutter in a rapid, solid state densification powder metallurgy (RSSDPM) process, and comprises a duplex microstructure comprising from about 10 to about 40 volume percent austenite and from about 60 to 90 volume precent martensite. The duplex microstructure may be achieved by incorporating a minor fraction of pure nickel and/or manganese powder in the powder mix used in the process, thereby providing nickel or manganese enrichment of the austenitic zones of the matrix.

REFERENCES:
patent: 3800891 (1974-04-01), White et al.
patent: 4554130 (1985-11-01), Ecer
patent: 4562892 (1986-01-01), Ecer
patent: 4592252 (1986-06-01), Ecer
patent: 4630692 (1986-12-01), Ecer
patent: 4726432 (1988-02-01), Scott et al.
patent: 4836307 (1989-06-01), Keshavan et al.

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