High toughness high-speed steel member and manufacturing method

Details High toughness high-speed steel member and manufacturing method High toughness high-speed steel member and manufacturing method

1996-02-12

1997-07-29

Ip, Sikyin

Metal treatment

Stock

Ferrous

420 10, 420101, 420102, C22C 3824

Patent

active

056518420

ABSTRACT:
Disclosed is a high-speed steel member and manufacturing method thereof. The member has Nb content of 0(incl.) to 2.0 (excl.) % in the hard state after hardening and tempering and in its micro-structure, contains either or both of M.sub.6 C and M.sub.2 C type carbides representing a rate of 0 to 2% to the total area, and the remainder substantially consisting of MC type carbide. The difference of crystallization temperatures is 30.degree. C. or more between MC type carbide and M.sub.6 C or M.sub.2 C type eutectic carbide. The high-speed steel member exhibits a high toughness and a small anisotropy of the mechanical property namely, a hardness of HRC 60 or more and a Charpy impact value ratio between the longitudinal direction and the direction perpendicular thereto in a forged material is 0.7 or more and are quite useful for plastic working.

REFERENCES:
patent: 3211593 (1965-10-01), Krekeler
patent: 4116684 (1978-09-01), Uchida et al.
patent: 4224060 (1980-09-01), de Souza et al.
Steven et al, "High-Performance High-Speed Steels by Design", Transactions of the ASM, vol. 57, 1964, pp. 925-948.
Mizuno et al, "The Influence of Alloying Elements on the Morphology of MC Primary Carbide Precipitation in Mo-Type High Speed Tool Steel", Electric Steel Making, vol. 55, No. 4, 1984.

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