(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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From this work, they determined that the stress intensity was related to the square root area of the defect in the plane normal to the principal stress, and they developed a stress intensity equation as a function of the square root area of an inclusion as follows:.
Travel of the signal indicates varied depth of the discontinuity from the scanning surface, often indicative of a crack. No partial decarburization apparent on the gear tooth. Determining the reasons for materials-based fatigue failures can be a challenge, While stringers do tend to be larger and therefore more injurious when present in a critically loaded location, it is much more probable that an injurious micro inclusion will be located in a critical location compared to a stringer.
Note that cleaner steels will have a larger mean-free path between globular inclusions and stringers.
AGMA B05 – Metallurgical Specifications for Steel Gearing
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. For bar stock 923-n05 forged shafting including step shafts for solid on shaft pinion blanks as in figure 5: For carburize and hardened gearing and induction or flame hardened gearing the hardness is measured at 0. Key terms used in this document are defined as follows: The tooth area includes only those portions of the gearing material where the teeth will be located to a depth below the finished tooth tips of at least 1.
A representative test coupon sized for determining the core hardness and microstructure can also be used for determining the case properties or as a process control test coupon.
[PDF] AGMA B05 – Free Download PDF
Reheating to a temperature below the transformation range. Medium carbon alloy steel. Strength and quality of materials ISO This microstructure zone should be free of blocky ferrite, pearlite, and measurable bainite. Both methods require that prior to carburizing the process control specimen, sufficient stock be machined from the surface to be carburized, in order to remove all material with non–uniform surface chemistry.
Refer to the applicable gear rating standards for specific gear ratings. Shot peening of the flanks of gear teeth should be reviewed to ensure that no zgma effects are caused to the gear set.
TimkenSteel can produce any of its grades to this new steel micro-cleanness standard. This information sheet identifies specifications and requirements for various metallurgical quality grades for through hardened, carburize and hardened, induction and flame hardened, and nitrided gearing.
AGMA technical publications are subject to constant improvement, Association revision, or withdrawal as dictated by experience. This sensitivity shall be used when radially scanning the portion of the wrought material that will comprise the tooth area.
Any person who refers to any AGMA technical publication should be sure that the publication is the latest available from the Association on the subject matter.
Monday, December 31, For nitriding specifications surface hardness is typically used rather than case hardness. The representative test coupon, when positioned in a heat treat load in the same general area but separate from the piece part, is intended to 923-b0 the metallurgy of the heat treated tooth section.
You may delete a document from your Alert Profile at any time. See figures 1 through 4 for photomicrographs of various classifications of carbide structures white constituent in tempered martensite. As a result, the zgma work cannot provide a figure for oxide stringers equivalent to Figure 8. Log in to leave a comment. The section size which has the greatest effect in determining the rate of cooling during quenching at a location where the specified hardness is required.
This coupon should remain with the part s represented throughout the entire heat treat process, with the possible exception of heat treatments prior to carburizing. For procedures associated with representative test coupons, see 4. These characteristics should be compatible, wherever possible, with ISO All standards are subject to revision, and parties to agreements based on this document are encouraged to investigate the possibility of applying the most recent editions of the standards shown below.
The introduction of nascent nitrogen into a suitable solid ferrous alloy by holding at a suitable temperature in contact with a nitrogenous material. As a result of agna inclusions amplifying local stresses, these gears exhibited a lower fatigue performance index. The various characteristics are listed in the order in which that characteristic is typically evaluated during the manufacturing sequence. Alternate terminology for a process control test coupon. A maximum case depth is prescribed in order to minimize the risk of embrittlement in the tooth area, including the tips.
Carburizing is generally followed by quenching and reheating tempering of an item to produce a hardened and tempered case. Due to the state of the art of alternate microhardness testing methods, results may vary by the equivalent — ISOby comparison to micrographic diagrams, Method B, Plate II with 0.
The properties of a process control coupon may be correlated by experience to the properties of the finished gearing with regard to hardness and case depth. 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. Microstructure of case along Primarily fine Primarily fine acicular tempered Primarily fine acicular tempered flank for pitting resistance acicular marten- martensite.
Magnetic particle inspection of finished gearing5 7 8 9 — Below the 923-0b5 line Not specified.