(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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The method of correlation should be documented.
Gear Design Relevant Cleanness Metrics
The consolidated tables were submitted to the gear rating committees for their agreement and are published here for reference by other standards. The controlling section size for the selection of an aagma type of steel and specified hardness combination must consider part configuration at the time of heat treatment.
Key terms used in this document are defined as follows: Larger chamfers minimize this problem. This standard sgma also available to be included in Standards Subscriptions. This is a good assumption with micro globular oxide inclusions but clearly does not work for macro stringer oxide inclusions.
If the coupon is to be used only to determine the case properties, it can be smaller than 923-b005 used to determine the core properties of the gear tooth. An uninterrupted ultrasonic testing signal on the display which moves horizontally on the sweep line as the transducer is moved on the scanning surface.
Item Detail – AGMA B05 (reaffirmed April 8, )
Stereographic methods are employed to generate volumetric inclusion population density, and linear elastic fracture mechanics are employed to illustrate critical flaw size for initiation and growth of a fatigue crack in application. The hardness at the intersection of the root circle and the centerline of the tooth at mid–face 92-b05 that was developed during the hardening of carburized gearing.
Base hardness agmw surface Not specified. These characteristics are not necessarily applicable to carbonitrided or nitrocarburized gearing, neither of which are covered by this document. When there is a greater population of inclusions, more of the gears in the Monte Carlo set exhibited inclusions in load zones.
Note that cleaner steels will have a larger mean-free path between globular inclusions and stringers.
Refer to the applicable gear rating standards for specific gear ratings. The tooth area includes only those portions of the gearing material where the teeth will be located to a depth below the finished tooth tips of at least 1.
The balance of the document remains unchanged. Mean-free path can quickly be used to consider the likelihood of an inclusion being present in a component and is valid for both globular oxides and stringers. Hardness – Listed below are each method and the associated processes which are tested by that method. The minimum acceptable requirements for each factor for metallurgical quality Grades 1 and 2 are specified. An aggregate of ferrite and cementite resulting from the transformation of austenite at temperatures below the pearlite range but above the martensite start temperature.
Suggestions for improvement of this information sheet will be welcome. Method 2 — Reduction of hardness Surface hardness readings are taken in the same area using two different hardness testing loads, such as HRC and HR15N with major loads of kg and 15 kg respectively.
With induction or flame hardening there is no significant alteration of the chemical composition of the surface layer. Grade 1 Not specified. The producer documents that the material was produced with the processing steps and controls that the producer has established to assure compliance with the specification, but the testing to confirm compliance is not required. No total or partial decarburization apparent on the finished gear tooth.
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. Any post–heat treat stock removal must be considered. Predominantly 5 or finer.
Maximum 3 HRC points or equivalent below maximum measured hardness by conversion, but measuring at least 58 HRC or equivalent by conversion in the finished state. Non–metallic inclusions Not specified.
Other mechanical testing is required only if specified. The chemical content of the inclusions is of particular use to the steelmaker in defining practices to improve steelmaking practices, while the inclusion geometry and distribution information is of particular use to the gear designer. This standard is not included in any packages. A published 9923-b05 for use in converting from one hardness testing scale to another. These definitions may differ from those in other AGMA publications.
[PDF] AGMA B05 – Free Download PDF
It is not the intent of this document that all requirements for metallurgical quality grade be certified, but that practices and procedures be established for their compliance on a production basis. TimkenSteel has developed a virtual gear life model that allows the simulation of stresses in gears in a xgma state, without inclusions, and then again with inclusions.
In carbon and alloy steels this phase is stable at room temperature.
Note that this is the same definition used in ISO 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. At intermediate stress intensity levels, the crack growth is log-log linear, and at higher stress intensities, the critical stress intensity is reached, and rapid fracture occurs.
A generic term for microstructures formed by 923-b0 diffusionless phase transformation of austenite.