Document Type and Number:
Japanese Patent JPS5092814
Kind Code:
A
Abstract:
1483891 Ion implantation; hardening steel surfaces N N ENGEL 15 Nov 1974 [14 Dec 1973] 49506/74 Heading C7U A steel substrate containing 0.3 to 1.8% of interstitial alloying atoms is implanted with ions of an element which is insoluble in iron by ionbombardment, and then heat-treated to produce a superhard martensitic structure. The substrate may initially contain Be, B, C or N as interstitial alloying atoms, or these may be alloyed therewith after ion-bombardment. The steel may be cleaned before placing in a vacuum chamber as the cathode, and the chamber is flushed with inert gas prior to bombarding with ions of He, Ne, Ar, Kr, Xe, Rn, Li, Na, K, Rb, Cs, Fr, Ca, Sr, Ba, Ra, Ag, Cd, Hg, Tl, Pb, Bi, Mg, Y, La, Zr, Hf, Th, Ta, Cu, In, Se, Te or Po; preferred ions are those of size similar to Fe. The steel is then heated into the austenite range and quenched in water, oil, or air to produce a superhard martensite, e.g. of Knoop hardness above 1000, and of maximum grain size 0.001 mm.
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Application Number:
JP14207274A
Publication Date:
July 24, 1975
Filing Date:
December 12, 1974
Export Citation:
International Classes:
C21D1/09; C23C8/38; C21D1/18; C23C14/48; C23C14/58; (IPC1-7): C21D1/78