ANSI/AGMA 6033-b98 pdf free.American National Standard – Materials for Marine Propulsion Gearing.
The terms used in this document, wherever applicable, conform to AGMA 904—B89, ANSI/AGMA 101 2—F90, ASTM A91 9 and ASTM A941. Key terms used in this document are defined as follows:
NOTE: These definitions may differ from those in other AGMA publications. The user should not assume that familiar terms can be used without a careful study of their definitions.
alloy steel: A steel containing specified quantities of alloying elements (other than carbon and the commonly accepted amounts of manganese, copper, silicon, sulfur and phosphorus) added to affect changes in mechanical properties.
annealing: The heating to and holding at a suitable temperature above the upper transformation temperature and then cooling typically in the furnace at a suitable rate, for reducing hardness, improving machinability, producing a desired microstructure or obtaining desired mechanical properties.
austenite: A solid solution of one or more elements in face—centered cubic iron. In carbon and low alloy steels this phase is stable only at elevated temperatures and is non—magnetic.
austenitizing: The forming of austenite by heating a ferrous material into the transformation range (partial austenitizing) or above the transformation range (complete austenitizing).
bainite: An aggregate of ferrite and cementite resulting from the transformation of austenite at temperatures below the pearlite range but above the martensite start temperature. Its appearance is feathery if formed in the upper part of the bainite transformation range and acicular, resembling tempered marterisite. if formed in the lower part.
base hardness: The surface hardness in the tooth area that was developed by through hardening and not changed by subsequent heat treatments. If the material selected has adequate hardenability for the required hardness and section size combination, the surface hardness represents the expected hardness at the intersection of the root circle and the centerline of the tooth at mid—face width. Base hardness is applicable to through hardened, nitrided and induction hardened gearing but not to carburize and hardened gearing.
bending strength: The bending strength of gear teeth is related to their resistance to gear tooth bending failure. Bending failure is a fatigue phenomenon usually resulting in cracking at the tooth root fillet. For internal gears or gearing with insufficient tooth backing, the failure may occur at the critical section. Typical cracks and fractures are illustrated in ANSI/AGMA 1O1O—E95. The intent of the AGMA strength rating formula is to determine the load which can be transmitted for the design life of the gear drive without causing root fillet or critical section cracking. The basic theory employed in bending strength analysis assumes the gear tooth to be rigidly fixed at its base with loads modified to consider compressive stresses at tooth roots, the angle at which the load is applied, stress concentrations at the tooth root fillets and the load sharing between adjacent teeth. This term was formerly known as strength. Compare to the terminology “pitting resistance”. See ANSI! AGMA 6032-A94.
carbide: A microstructural phase which is a cornpound of metal (M) and carbon (C) having the chemical formula of MCy. See figures 12, 13, 14 and 15 for example photomicrographs of various classifications of carbides.ANSI/AGMA 6033 pdf download.