(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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Surface cracks 12 13 Cracks, bursts, seams and laps are not permissible in functional areas of finished gearing. Shot peening of the flanks of gear teeth should be reviewed to ensure that no detrimental effects are caused to the gear set. A case depth should be specified in hardening pattern per figure 14 shall be specified. Monte Carlo simulations were run comparing Ultrapremium to SBQ 1 and SBQ 2 in order to assess the potential 93-b05 light weighting Figure 12 or increased torque capacity Figure 13 while maintaining fatigue performance.
This method of steel cleanness rating has been used for decades in order to assure the level of steel cleanness is achieved per a specified limit. Maximum acceptable length of any carbide is 0.
Reduction of Not specified.
Gear Design Relevant Cleanness Metrics | Gear Solutions Magazine Your Resource to the Gear Industry
Other mechanical testing required only if specified. No agmaa operator interaction is needed until the analysis is completed and the system is ready for the next carousel of samples. Retempering is required after cold treatment. At the time of initial development, the editions shown were valid. No total or partial decarburization apparent on the finished gear tooth. A representative test coupon should have the same heat treat condition prior to carburizing as the part s represented.
The reduction ratio is calculated by the following equation: 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. Figure 7 shows the calculated mean-free paths for the globular oxide inclusions greater than 10 mm in square root area and stringers longer than mm wgma length. For procedures associated with process control test coupons, see 4.
Minimum specified effective case depth inch mm at less at less least than least than You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.
Item Detail – AGMA B05 (reaffirmed April 8, )
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. Each of the first three steels gama produced by electric arc furnace and vacuum refining, and each meet AGMA grade 3 and ASTM A  bearing steel quality requirements for oxide inclusion cleanness.
Sound metallurgical practice dictates that the microstructure requirements in the tooth area should be predominantly tempered martensite with limited upper transformation products ferrite, upper bainite and fine pearlite. However, properly selected test coupons can also be used. As such, these data alone have great utility in identifying steel sources that can meet the cleanness requirements demanded 923–b05 highly loaded, power-dense transmission systems.
Variations from expected process control limits are used as indicators of unacceptable heat treat process variations. AGMA technical publications are subject to constant improvement, Association revision, or withdrawal as dictated by experience. Figure 9 illustrates the progression of a gear tooth bending fatigue failure as a result of a globular oxide micro inclusion. The gear rating may be limited by either pitting resistance or bending strength for the selected metallurgical quality grade and its core hardness requirement.
Gear Design Relevant Cleanness Metrics
923–b05 to a temperature below the transformation range. Figure 923-b5 shows a comparison of the number of inclusions greater than 10 mm and greater than 20 mm in square root area per cubic centimeter. The various characteristics are listed in the order in which that characteristic is typically evaluated during the manufacturing sequence. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.
As a result of these inclusions amplifying local stresses, these gears exhibited a lower fatigue performance index.
This process is repeated for each stringer inclusion type A, B, C. Surface cracks7 8 Cracks, bursts, seams and laps are not permissible in functional areas of finished gearing.
Travel of the signal indicates varied depth of the discontinuity from the scanning surface, often indicative of a crack. The representative test coupon, when positioned in a heat treat load ahma the same general area but separate from the piece part, is intended to represent the metallurgy of the heat treated tooth section. Nitrided The effective case depth is measured from the finished surface to a location where the hardness number is equivalent to This zgma in a thin layer of high magnitude residual surface compressive stress and generally improves the bending strength in the roots of gear teeth.
Material reduction ratio Not specified. Specific sampling plans and test methods need to be addressed by either the manufacturer, the customer, or both.
The metal test distance for the blocks shall be 4. The microstructure at the center of the minimum size representative test coupon approximates the core microstructure of the tooth section. As the voice of the U. The hardness measured directly on the functional surface, after appropriate surface preparation.
Individual AGMA rating standards may have specific modifications to the metallurgical characteristics grading; but the intent is to formalize the assumptions and definitions on which the various AGMA standards 9923-b05 based. The Ultrapremium practice for its strand cast process path is under development.