High stress nodular iron gears and method of making same

Details High stress nodular iron gears and method of making same High stress nodular iron gears and method of making same

F - Mech Eng,Light,Heat,Weapons

16

H

148/10, 74/215

F16H 55/02 (2006.01)

Patent

CA 1108036

High STRESS NODULAR IRON GEARS AND METHOD OF MAKING SAME Abstract of the Disclosure: . High stress, acicular bainitic, nodular iron gears having residual compressive stresses at the surface of the teeth's roots of at least about 40,000 psi and a subsurface residual compressive stress of about 10,000 psi at a depth between about 0.006 inch and 0.015 inch beneath the surface. Method for making gears including: casting nodular iron blank; heating blank to ferritize its microstructure prior to cutting teeth into the blank; heating it in a nonoxidizing environment to an austenitic phase dissolved-carbon-content of about 0.7% to about 1.1%; rapidly quenching the austeni- tized casting to an acicular-bainite-forming isothermal transformation temperature; isothermally transforming the austenite at that temperature to at least 50% acicular bainite before cooling; and shot peening at least the roots of the teeth to impart the residual compressive stresses thereto.

294970

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