(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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Grade 3 is restricted to contour spin induction Type A Contour hardening only. The ing subsequent stock removal, microstructure should be free of undissolved pearlite observable at X and measurable disregarding corner bainite observable at — X. Reheating to a temperature below the transformation range. Care must be taken when grinding nitrided surfaces to ensure that no harmful surface conditions are produced in the grinding process.
Characteristics covered include raw material, heat treatment and post heat treat processing, and their associated inspections. Process control test coupons are not intended to be used for final acceptance.
The sum of the mid–points of the specified ranges for all alloying elements added to increase hardenability e. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. The gear rating may be limited by either pitting resistance or bending strength for the selected metallurgical quality grade and its core hardness requirement.
Magnetic particle inspection of Inspection recommended to the Inspection required to the finished gearing 6 11 12 13 following limits: Early in the running of this gear, the bending stresses, combined with the inclusion, were large enough to result in a stress intensity that exceeded the threshold, Kth, hence allowing a fatigue crack to initiate at the inclusion.
Any of the following methods are acceptable. Standards Subsctiption may be the perfect solution. Figure 8 shows a comparison of the number of inclusions greater than 10 mm and greater than agmw mm in square root area per cubic centimeter. 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.
Individual customers and manufacturers may have specific modifications to the metallurgical grade requirements 923b05 special material and processing conditions that are not covered in these tables. These characteristics should be compatible, wherever possible, with ISO This information aga identifies specifications and requirements for various metallurgical quality grades for through hardened, carburize and hardened, induction and flame hardened, and nitrided gearing.
The controlling section size for the selection of an appropriate type of steel and specified hardness combination must consider part configuration at the time of heat treatment.
Under high contact stress conditions of approximately MPa, a 10 mm inclusion is predicted to be of a critical size, while for a root bending stress of approximately MPa, a 20 mm inclusion is predicted to be of a critical size. In each case, the Z-contrast of these particles against the steel matrix makes them readily detectable.
The maximum permitted section size for an alloy steel increases with the hardenability of the alloy steel. Magnetic particle inspection of Inspection recommended to the Inspection required to the following finished gearing 7 20 21 22 following limits: Rejection of piece parts shall only be based on case hardness.
Metallurgical characteristics for induction or flame hardened gearing. In the rating method called out in ASTM E45 Method A, an operator uses a light optical microscope to scan the polished surface of a specimen at times magnification looking for the worst field for each of four inclusion types, with thin and heavy categories for each type.
Sound metallurgical practice dictates that the core microstructure requirements are maintained in the tooth area to a depth twice the minimum specified effective case depth or 0. For D type globular oxides, the worst 0. For carburized gearing the maximum depth of diffused carbon.
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A test coupon designed to represent the quenching rate of the finished gearing tooth. Subscription pricing is determined by: Surface cracks20 Cracks, bursts, seams and laps are not permissible in Cracks, bursts, seams and laps are functional areas of finished gearing.
This is a good assumption with micro globular oxide inclusions but clearly does not work for macro stringer oxide inclusions. Need more than one copy?
Martensite is characterized by an acicular or needle–like pattern in the microstructure and is the hardest of 923-n05 austenitic transformation products in steel. The distance from the finished tooth surface to a specific sub–surface hardness value.
Note that cleaner steels will have a larger mean-free path between globular inclusions and stringers.
Cast gears Only permissible if primarily round Type 1 sulfide inclusions. 92-b05 the specific type of case depth such as effective or total case depth. Note that this is the same definition used in ISO As a result 92-b05 these inclusions amplifying local stresses, these gears exhibited a lower fatigue performance index.
Carburize and hardened The effective case depth is measured normal to the finished gear surface to a location where the hardness number is 50 HRC HK or HV min by conversion from a microhardness test result.