Gray cast iron having both increased wear resistance and toughne

Details Gray cast iron having both increased wear resistance and toughne Gray cast iron having both increased wear resistance and toughne

1988-10-11

1990-01-02

Andrews, Melvyn J.

Metal treatment

Compositions

Heat treating

148138, 148321, 420 15, 420 26, 420 27, 420 32, C21D 500

Patent

active

048910767

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.

REFERENCES:
patent: 2885284 (1959-05-01), Moore
patent: 3384515 (1968-05-01), Ackerman et al.
patent: 4230506 (1980-10-01), Clark
patent: 4596606 (1986-06-01), Kovacs et al.
Metals Handbook, 9th ed., vol. 1, pp. 12-13 and 24-26, 1978.

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