(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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Agmma standard is also available to be included in Standards Subscriptions. The AGMA information sheet on steels for gears requires that oxide inclusion ratings meet certain limits in order to meet grade 2 or 3 gear steel quality requirements.
The various characteristics are listed in the order in which that characteristic is typically evaluated during the manufacturing sequence. Log in to leave a comment. A cold working process performed by bombarding the surface of a part with small spherical agmz.
TimkenSteel has developed a virtual gear life model that allows the 923-v05 of stresses in gears in a baseline state, without inclusions, and agmaa again with inclusions.
A total reference area A tot is selected, which is used to provide a limit for performing an extrapolation of the data set in order to predict the SEV value. Carbon – See surface carbon. The Saltykov method assumes that the features being addressed are all spherical. For induction or flame hardened gearing, alternative terminology for effective case depth. Continuous Cooling Transformation Diagrams.
The SEM scans each mm 2 sample and stops on any particle larger than 3 mm in square root area. For induction or flame hardened gearing, unless otherwise specified, the effective case depth is 4 Procedures 4. The field size used for rating is 0. The metal test distance for the blocks shall be 4. The next two are from domestic special bar quality SBQ steel mills. Controlling section size, inch at least less than 5 10 10 15 15 Controlling section size, mm at least less than Ultrasonic inspection3 5 Wrought agna.
Grain size Predominantly 5 Predominantly 5 or finer. In carbon and low alloy steels this phase is stable only at elevated temperatures and is non–magnetic. At intermediate stress intensity levels, the crack growth is log-log linear, and at higher stress intensities, the critical stress intensity agja reached, and rapid fracture occurs. A solid solution of one or more elements in body–centered cubic iron. The quench severity must also be adequate in order to afma the required core hardness.
The material must have adequate hardenability for the required abma and section size combination for the required core hardness to be achieved. However, this method does not provide inclusion metrics that are relevant to gear design, and it cannot provide the statistically robust data needed to predict gear performance.
AGMA B05 – Metallurgical Specifications for Steel Gearing
Commercial grain size is categorized as either coarse grain size or fine grain size 5 or finer. Next, a measure of the accumulated inspected area for each of the rank ordered samples, described as the reduced variate, Y, is calculated at each j value.
When there is a greater population of inclusions, more of the gears in the Monte Carlo set exhibited inclusions in load zones.
A minimum hardenability verified by certification, calculation or test which is appropriate for part size and quench severity should be specified. Need more than one copy? The dimensions in this document are always to be measured normal not oblique to the surface.
Gear Design Relevant Cleanness Metrics
See figures 11, 12 and 13 for examples of visual estimates of retained austenite white constituent in tempered martensite. As repeated cycles were applied, the crack continued to grow, and the crack tip stress intensity continued to increase. Carbide precipitation in the Continuous carbide case. No total or partial decarburization apparent on the finished gear tooth. Conversations with multiple gear designers and failure analysts indicate that these predicted values are consistent with real-world experiences with heavily loaded gears.
Maximum 2 HRC points or equivalent by conversion. The hardness number reported on a scale different from the scale used for hardness testing. Grade 3 Test report only. For carburize and hardened gearing and induction or flame hardened gearing the hardness is measured at 0. Table 1 – Metallurgical characteristics for through hardened gearing Item Characteristic1 2 1 Material chemistry 2 3 4 Grain size Hardenability Grade 1 Not specified verified.
Quantitative stereology ,  can be used to predict the mean-free path between inclusions or the volumetric concentration of inclusions based on the measured unit area data. At the time of initial development, the editions shown were valid. Your Alert Profile lists the documents that will be monitored.
However, where necessary, specific notation is made to reflect the special processing methods, techniques and inspections required for large gear manufacturing. Some characteristics are only applicable to specific heat treat methods. Murakami and co-workers  used stress analysis to evaluate a broad range of defect shapes and sizes, under a range of loading conditions. When a solid body is subjected to stress, and there is a crack or a flaw, such as an inclusion, the stress is concentrated in the vicinity of the flaw.