(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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A test coupon designed to represent 923-v05 quenching rate of the finished gearing tooth. Other mechanical testing is required only if speci- cal testing is required only if specified. An alternative location is given by ISOtable 4, item 8. 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.
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. Shim stock is often used to monitor atmospheric carbon potential. The preferential oxidization of certain alloying elements along grain boundaries during gas carburizing. Metallurgical characteristics for carburize and hardened gearing.
For bar stock and forged shafting including step shafts for solid on shaft pinion blanks as in figure 5: Shot peening should not be confused with grit blasting or shot blasting which are cleaning operations.
Effort was made to reference ISO specifications where possible. Gama – See surface carbon. 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 material. The various characteristics are listed in the order in which that characteristic is typically evaluated during the manufacturing sequence.
In order to provide a more direct linkage between gear design and steel cleanness effects on gear fatigue performance, some further analytical processes can be performed on these automated SEM image 923-v05 data. 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.
A maximum case depth is prescribed in order to minimize the gama of embrittlement in the tooth area, including the tips. 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.
Base hardness is applicable to through hardened, induction hardened, flame hardened, and nitrided gearing, but not to carburize and hardened gearing. Martensite is characterized by an acicular or needle–like pattern in the microstructure and is the hardest of the austenitic transformation products qgma steel. Retempering is required after cold treatment.
Non–metallic inclusions Not specified. The oxide inclusion content limits for Ultrapremium steels are on par with typical values for oxide inclusions in vacuum arc re-melted VAR steels, but at a much lower cost.
Magnetic particle inspection of Inspection to the following limits: As individual gearing designs increase in size and complexity of features, they become more difficult to manufacture, heat treat, and inspect. See specific kind of hardness such as base, case, core or surface.
Intergranular oxides – In the unetched condition, see metallography and figure 9. Either method is acceptable.
Gear Design Relevant Cleanness Metrics | Gear Solutions Magazine Your Resource to the Gear Industry
Characteristics that are typically evaluated at the same time are grouped by having the same number before the decimal point, and modified with different numbers after the decimal point for the individual characteristics evaluated at that time. A 1 inch 25 mm diameter by 2 inches 50 mm long coupon may be used for coarser pitch module carburized gearing to 1. For D type globular oxides, the worst 0.
This microstructure should be free of blocky ferrite, pearlite, and measurable bainite observable at X. 923-v05 terminology for ferrite, carbide, retained austenite, pearlite, and bainite due to incomplete transformation to martensite or incomplete austenization. The consolidated tables were submitted to the gear rating committees for their agreement and are published here for reference by other standards. In practice, microsegregation and banding occurs in steels. If the material selected has adequate hardenability for the required hardness and section size combination, this surface hardness represents the expected hardness at the abma of the root circle and the centerline 923-b055 the tooth at mid–face width.
As illustrated in Figure 6a linear regression using the maximum likely linear fit is made of the rank-ordered extreme value data, and the value at which this regression intersects the Y xgma value is the SEV maximum likely inclusion value.
Figures 5 through 8 illustrate the controlling section size for various gearing configurations whose teeth are machined after heat treatment and whose hardness must be maintained at the roots of the teeth.
Due to differences in quench cooling rates and hardenability, the microstructure and hardness of process control test coupons used aga carburize and hardened gearing may not be the same as that of the finished gear tooth. Historically, inclusions are measured against ASTM E45  or similar micro cleanness specifications using light optical microscopy LOM and six samples to represent a heat.
Gear Design Relevant Cleanness Metrics
The microstructure at the center of the minimum size representative test coupon approximates the core microstructure of the tooth section. The microstructure in this zone should be predominantly tempered wgma.
Any of the following methods are acceptable. The measurement method should be appropriate for the size and configuration of the work pieces.
Any of the following methods are acceptable Should meet the following surface related characteristic: