The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 02, 1990
Filed:
Oct. 11, 1988
Bela V Kovacs, Bloomfield Hills, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
A method is disclosed for making gray iron having both increased wear resistance and impact toughness, comprising: (a) solidifying a hypoeutectic gray iron melt (i) to which has been added a eutectic carbide forming agent in an amount of 0.3-0.8% by weight, selected from the group consisting of Ti, V and Cr, and, advantageously, a high carbon austenite/ferrite forming agent in an amount of 0.5-3.0%, by weight, selected from the group consisting of nickel and copper, and at a solidification rate to form an austenite matrix with a mixture of flake graphite and eutectic carbide particles suspended in said matrix; and (b) heat treating the solid by (i) heating to a temperature and for a period of time to fully austenitize the solid, (ii) quenching the solid to a temperature level and for a period of time to decompose austenite to form a high carbon austenite and ferrite matrix, and (iii) air cooling the solid to room temperature. The hypoeutectic gray iron contains less than 4.35% carbon equivalent and preferably comprises, by weight, 2.5-2.95% carbon, 2.0-2.5% silicon, 0.5-0.90% manganese, and the remainder iron.