Cutter composed of Ni-Cr-Al Alloy
AssigneeKabushiki Kaisha Toshiba
InventorsTomohisa Arai, Takashi Rokutanda, Tadaharu Kido
Life of this patent
Estimating the term…
Abstract
A cutter is composed of a Ni—Cr—Al alloy containing from 32 to 44 mass percent of Cr, from 2.3 to 6.0 mass percent of Al, the balance being Ni, impurities, and additional trace elements and having a Rockwell C hardness of 52 or more. This Ni—Cr—Al alloy provides a cutter produced with a superior workability and by a significantly simplified process, having a low deterioration in the hardness even when heated in use, having excellent corrosion resistance and low-temperature embrittlement resistance, and satisfactorily maintaining the cutting performance for a long time.
Claims13
A method of manufacturing a cutter composed of Ni—Cr—Al alloy, the method comprising the steps of:
- preparing an alloy ingot by melting Ni, Cr, Al materials;
- conducting hot working and cold working to the alloy ingot thereby to form a plate;
- performing solution heat treatment to the plate at a temperature of 1,000° C. to 1,300° C. in argon atmosphere, nitrogen atmosphere, or in air;
- quenching the plate at a cooling rate higher than oil quenching to form a blank plate;
- performing aging treatment to the blank plate at a temperature of 550° C. to 800° C.;
- and
- forming a mirror-finished surface onto the blank plate by final polishing with a polisher.
Dependencies are inferred from the claim text.