Metal treatment – Process of modifying or maintaining internal physical... – Carburizing or nitriding using externally supplied carbon or...
Patent
1994-07-29
1996-07-16
Ip, Sikyin
Metal treatment
Process of modifying or maintaining internal physical...
Carburizing or nitriding using externally supplied carbon or...
148319, C23C 822
Patent
active
055363350
ABSTRACT:
A process for forming a low silicon rapid-carburizing wear resistant steel article includes selecting an article formed of a steel material having less than about 0.05% silicon by weight, and carburizing the article for a preselected time and temperature to form an austenitic surface and attain a carburized case depth which is at least 5% greater than the carburized case depth of a similar article formed from a steel material having a range of about 0.09% to about 0.25% silicon by weight and being carburized at substantially same conditions of time and temperature. After quenching, the as-carburized surface transforms into a microstructure of martensite and retained austenite, being substantially free of intergranular oxides. A low silicon rapid-carburizing wear resistant steel article formed according to the present invention is particularly useful for making gears, couplings, shafts, bearings, and similar articles subjected to a combination of high bending loads, surface wear and contact fatigue.
REFERENCES:
patent: 4836864 (1989-06-01), Murakami et al.
patent: 4921025 (1990-05-01), Tipton et al.
Article entitled "Internal Oxidation During Carburizing and Heat Treating" from Metallurgical Transactions A, vol. 9A, dated Nov. 1978.
Caterpillar Inc.
Ip Sikyin
Khosla Pankaj M.
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