09963940 cites 16 patents.

A method of forming an earth-boring tool includes introducing metal into a die, rotating the die to generate centrifugal forces on the metal, and cooling the metal in the rotating die. A rotary drill bit may include a unitary, centrifugally cast bit body including an integral shank, at least one blade, and at least one cutting element on the blade. A rotary drill bit or a roller cone may include a first centrifugally cast material and a second centrifugally cast material. Another rotary drill bit includes a bit body comprising a maraging steel alloy. A method of forming a rotary drill bit may include disposing cutting elements on a rotary drill bit comprising maraging steel and aging the rotary drill bit to form at least one intermetallic precipitate phase. Methods of repairing a rotary drill bit include annealing and aging at least a portion of a rotary drill bit.

Title
Rotary drill bits comprising maraging steel and methods of forming such drill bits
Application Number
14/674115
Publication Number
9963940 (B2)
Application Date
March 31, 2015
Publication Date
May 8, 2018
Inventor
Tu Tien Trinh
Houston
TX, US
Eric C Sullivan
Houston
TX, US
Xiaomin Chris Cheng
Houston
TX, US
Agent
TraskBritt
Assignee
Baker Hughes Incorporated
TX, US
IPC
B22D 19/06
B22D 13/04
C22C 38/14
C22C 38/08
C21D 1/18
B22D 19/00
B22D 13/02
C22C 38/12
C22C 38/10
C21D 6/00
E21B 10/36
E21B 10/00
C21D 9/22
B22D 25/02
B22D 19/16
B22D 13/00
E21B 10/55
E21B 10/42
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