(This Information Sheet is NOT an AGMA Standard). American Gear Metallurgical Specifications for Steel Gearing Manufacturers AGMA B05 CAUTION. (This Information Sheet is NOT an AGMA Standard). American Gear Metallurgical Specifications for Steel Gearing Manufacturers AGMA B05 Association. AGMA B05 Metallurgical Specifications for Steel Gear – Download as Word Doc .doc /.docx), PDF File .pdf) or read online. AGMA B05 Metallurgical.
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Gear Design Relevant Cleanness Metrics
A representative test coupon sized for determining the core hardness and microstructure can also be used for determining the case properties or as a process control test coupon. The inset pictures from the gear failure illustrate how this LEFM data relates to the gear failure. Quantitative stereography can be employed to convert the measured area concentration of inclusions to mean-free path between inclusions and volumetric concentration, enabling the gear design engineer to make direct comparisons of stressed volumes and volumetric inclusion concentrations.
If the bore diameter is less than 20 percent of the length of the bore, then the controlling section is determined by figures 5 or 7. Any of the following agmz are acceptable Should meet the following surface related characteristic: A segregated structure consisting of alternating, nearly agmx bands of different chemical composition, typically aligned in the direction of primary hot working.
Strength and quality of materials ISO A wide range of other geometric measures can be selected as needed. This well-established science applies the physics of solid mechanics stress and strain and the physics of energetic fracture processes to calculate the driving force for propagation of cracks in materials and predict crack behavior. It is recognized that the effective case depth of carburize and hardened gear teeth varies with location on the gear tooth.
Decarburization is indicated by a lower converted hardness for the lighter load compared to that from the heavier load, presuming that proper hardness testing techniques were used for both sets of tests. The properties of a process control coupon may be correlated by experience to the properties of the finished gearing with regard to hardness and case depth.
[PDF] AGMA B05 – Free Download PDF
The measurement method should be appropriate for the size and configuration of the work pieces. Comparing Figure 3 a to Figure 3 b, one notes that the population of stringers tends to run about one order of magnitude less than the micro inclusion concentrations. No agmq or partial 923-n05 apparent on the finished gear tooth. For procedures associated with process control test coupons, see 4. Type Fine Thick A sulfide 2.
This paper has illustrated how statistically robust inclusion population data, gathered with SEM automated image analysis, can generate the statistically rich data needed to robustly consider design concerns.
If atma document is revised or amended, you will be notified by email. The user should not assume that familiar terms can be used without a careful study of their definitions. This results in a thin layer of high magnitude residual surface compressive stress and generally improves the bending strength in the roots of gear teeth. Due to the tooth section size of 3 normal diametral pitch 8 module gearing and coarser, the alternate ISO core hardness test location may be used provided documented testing or experience is available.
Individual or isolated globular oxide particles see Figure 2lower-left are recorded as micro inclusions, and their geometry is reported by square root area. The back reflection method shall be used. The minimum inscribed diameter on a test disc or plate dimensions should be three times its thickness. Some characteristics are only applicable to specific heat treat methods. Each individual characteristic has the same item number in tables 1, 2, 3 and 4 whenever it is used, regardless of which table it appears.
This capability then facilitates the systematic study and optimization of steelmaking practices to minimize oxide inclusion population density.
Item Detail – AGMA B05 (reaffirmed April 8, )
B C D E F is the cross sectional area of agms billet prior to upsetting, in2 mm2 ; is the aga of the cutoff ingot prior to upsetting, inch mm ; is the height of the upset blank after upsetting before piercing, inch mm ; is the height of the upset blank after piercing, inch mm ; is the wall thickness of the qgma blank after piercing, before any bore expansion associated with piercing, inch mm ama is the height of the finish forged or rolled ring, inch mm ; is the wall thickness of the finish forged or rolled ring, inch mm.
The temperature at which a phase change occurs. This standard is also available to be 923-v05 in Standards 9223-b05. 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.
Surface cracks 12 13 Cracks, bursts, seams and laps are not permissible in functional areas of finished gearing. As noted previously, macro stringer inclusions are typically an order of magnitude less frequent than globular oxides and therefore much less likely to be in a critical area compared to one or more critically sized globular oxides.
Heat Treatment of Steel Gears July 15, Historically, inclusions are measured against ASTM E45  or similar micro cleanness specifications using light optical microscopy LOM and six samples to represent a heat. The hardness number reported on 923b05 scale different from the scale used for hardness testing.
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 increase hardenability and to affect changes in mechanical properties. Due to the state of the art of alternate microhardness testing methods, results may vary by the equivalent — ISOby comparison to micrographic diagrams, Method B, Plate II with 0.
More precise measurements of retained austenite can be obtained by X–ray diffraction techniques. For determination of case hardness, case depth, and case microstructure, the process control test coupon should be examined on a section normal to its axis and at least one diameter from the end of the test coupon.
The statistics of extreme values SEV can be used to predict the single largest inclusion ama in the steel, enabling the gear design engineer to consider the worst-case inclusion. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.