Metal treatment – Compositions – Heat treating
Patent
1985-12-23
1988-04-12
Dean, R.
Metal treatment
Compositions
Heat treating
148138, 148139, 148321, C21D 500
Patent
active
047371994
ABSTRACT:
A method is disclosed which comprises: (a) forming a ferrous alloy melt consisting essentially of by weight, 3-4% carbon, 2.0-3.0% silicon, 0.1-0.9% manganese, up to 0.02% phosphorus, up to 0.002% sulphur, up to 1% contaminants or impurities, 0-0.4% molybdenum, 0-3.0% nickel or copper, and the reminder essentially iron, the melt being subjected to a graphite modifying agent in an amount and for a period of time effective to form either ductile or semiductile iron upon solidification; (b) heat treating the solidification of said melt by austempering to form a matrix consisting substantially of high carbon austenite and ferrite and a cell boundary having unreacted low carbon austenite; (c) heating said austempered iron to a pearlite forming temperature (1200.degree.-1300.degree. F.) and holding (2-5 minutes) at said temperature to permit the unreacted low carbon austenite to form pearlite; and (d) cooling said heat treated iron to room temperature.
REFERENCES:
patent: 3421886 (1969-01-01), Schelleng
patent: 3549431 (1970-12-01), Castelet
patent: 3860457 (1975-01-01), Vourinen et al.
patent: 4227924 (1980-10-01), Subramanian et al.
Metals Handbook, vol. 1, 1978, ASM, pp. 7-8.
Dean R.
Ford Motor Company
Malleck Joseph W.
May Roger L.
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