(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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Item Detail – AGMA B05 (reaffirmed April 8, )
The hardness measured directly on the functional surface, after appropriate surface preparation. Type Fine Thick A sulfide 3. Rejection of piece parts shall only be based on case hardness. This well-established science applies the physics of solid mechanics stress and strain and the physics of energetic fracture processes to calculate the driving force for propagation of cracks in materials and predict crack behavior. A representative test coupon may contain a tooth form that will be used to verify the heat treat process.
Primarily tempered martensite with only trace non–martensitic structures permissible, carbide precipitation agam Item In each case, the Z-contrast of these particles against the steel matrix makes them readily detectable. Figure 14 – Variations in hardening pattern obtainable on gear teeth with flame or induction hardening 5. Quantitative stereology ,  can be used to predict the mean-free path between inclusions or the volumetric ag,a of inclusions based on the measured unit area data.
A sample used for tensile or impact strength testing. The non–uniform distribution of alloying elements, impurities, or phases observed primarily in the microstructure of the agna. Maximum 2 HRC points or equiva- No reduction in hardness below lent below maximum measured maximum measured hardness by hardness by conversion. 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.
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Gear Design Relevant Cleanness Metrics
Microhardness – See hardness. 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.
For procedures associated with process control test coupons, see 4. Therefore, it is suggested that the conversion chart used for testing and reporting be specified. A representative test coupon should have the same heat treat condition prior to carburizing as the part s represented.
In each case, the steel types are nominally equivalent carburizing steel chemistries. More precise measurements of retained austenite can be obtained by X–ray diffraction techniques. Magnetic particle aggma of Inspection recommended to the Inspection required to the following finished gearing 7 20 21 22 following limits: In carbon and alloy steels this phase is stable at room temperature.
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. 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.
Need more than one copy? At the time of initial development, the editions shown were valid. Predominantly 5 or finer. Topics related to gear design and rating, such as case depth, stress numbers, and quality control sampling plans are not included in this document.
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 lim value is the SEV maximum likely inclusion value.
A segregated structure consisting of alternating, nearly parallel bands of different chemical composition, typically aligned in the direction of primary hot working. 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.
AGMA technical publications are subject to constant improvement, Association revision, or withdrawal as dictated by experience.
Similarly, if the same automotive ring agmz is determined to have 0. Monday, December 31, The formula for calculating the volume density, N Vfor each range N V j is then:. For determination of case hardness, case depth, and case microstructure, the process control test coupon should be examined on a section normal to its axis and at least one diameter from the end of the test coupon. This microsegregation can produce variations abma microstructure and properties that need to be assessed.
The term core hardness is applicable to carburize and hardened gearing. The total case depth for induction or flame hardened gearing is usually assumed to be the same as the hardened and effective case depths.