AMORPHOUS IRON ALLOY HAVING HIGH STRENGTH AND RESISTANCE TO FATIGUE, GENERAL CORROSION, PITTING CREVICE CORROSION, STRESS CORROSION CRACKING AND HYDROGEN EMBRITTLEMENT

摘要

PURPOSE:To provide a titled alloy obtd. by forming Fe contg. a specific amt. of Cr, Ni and B as metalloid into an amorphous structure. CONSTITUTION:An amorphous iron alloy consists, by atom%, of 1-40% Cr and 0.01- 40% Ni, contains 7-35% B as metalloid and consists of the balance Fe and has high strength and resistance to fatigue, general corrosion, pitting, crevice corrosion, stress corrosion cracking and hydrogen embrittlement. The alloy is formed by putting a raw material metal into, for example, a quartz tube 1 provided with a nozzle 2 for ejecting the metal in a horizontal direction at the lower end, melting the metal in a heating furnace 4 and rotating a drum 5 formed of Al, etc. lined with a copper plate 7, etc. at a high speed by a motor 6. The tube 1 is then lowered by an air piston 8 to bring the nozzle 2 opposite to the inside surface of the drum 5. When the tube is raised thereafter, a gaseous pressure is exerted approximately simultaneously on the metal 3, by which the metal is gushed to the inside surface of the drum and is cooled at an extra- high speed. The amorphous metal is thus formed. An inert gas 9 is continuously fed to the inside of the tube 1 to prevent oxidation of the metal 3.