ANSI/AGMA 2004-B89 pdf free.Gear Materials And Heat Treatment Manual AGMA 2004 -B89 (Revision of AGMA 240.01).
Annealing — Full. Full annealing consists of heating steel or other ferrous alloys to 1475—1650°F (802—899°C) and furnace cooling to a prescribed temperature, generally below 600°F (316°C). This treatment forms coarse lamellar pearlite, the best microstructure for machinability of low and medium carbon steels. Unless otherwise stated, annealing is assumed to mean full annealing.
Annealing — Spheroidizing. Spheroidize annealing is a process of heating and cooling steel that produces a globular carbide in a ferntic ma- mx. This heat treatment results in the best machinability for high carbon (0.60 percent carbon or higher) and alloy steels.
Austempering. Austempering is a heat treat process consisting of quenching a ferrous alloy (steel or ductile iron) from a temperature above the transformation range in a medium having a rate of cooling sufficiently high to prevent high temperature transformation products, and maintaining the alloy temperature within the bainitic range until desired transformation is obtained. The bainitic transformation range is below the pearlitic range, but above the martensitic range. Austempering is applied to steels and, more recendy in the development stage for ductile iron gearing (refer to 4.8.4.3).
Austenite. Austenite in ferrous alloys Is a microstructural phase consisting of a solid solution of carbon and alloying elements In face—centered cubic crystal structured iron.
Austenlilsing Temperature. The temperature at which ferrous alloys undergo a complete rnicrostructural phase transformation to austenite.
Rainite. Bainite is a mlcrostructural phase resulting from the transforrnauon of austenite. and consists of an aggregate of ferrite and iron carbide. Its appearance is feathery if formed in the upper portion of the bainite transformation range. and acicular if formed in the lower portion.
Carbon. Carbon is the principal hardening element An steel, and it’s amount determines the maximum hardness obtainable. Generally as carbon is increased, tensile strength and wear redstance increase; however, ductility and weldabilky decrease.
Carbonitriding. A modified form of gas carburizing, in which steel (typically plain carbon and very low alloy) is heated between 1450—1650°F (788—899°C) in an ammonia enriched carburizing atmosphere. This results in simultaneous absorption of carbon and nitrogen which results in the formation of complex niuides in a high carbon case.ANSI/AGMA 2004 pdf free download.