(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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This process is repeated for each stringer inclusion type A, B, C.
Gear Design Relevant Cleanness Metrics
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. 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.
The reduced variate is calculated as follows:. Applied Process Southridge, Inc. This is especially true with rapid short heating cycles. The maximum permitted section size for an alloy steel increases with the hardenability of the alloy steel. Intermediate values are not classified since the effect of deviations from the quality standards cannot be evaluated easily. Larger chamfers minimize this problem.
Reduction of Not specified. It is recognized that the effective case depth of carburize and hardened gear teeth varies with location on the gear tooth.
Therefore, some item numbers are not used in some tables. Your Alert Profile lists the documents that will be monitored. The minimum acceptable requirements for each factor for metallurgical quality Grades 1 and 2 are specified.
The generic terminology for selective induction or flame heating of a surface layer and then quenching that layer to produce a hardened surface layer that may be thinner than the heated area, but is harder than the unheated base material. Hardness – Listed below are each method and the associated processes which are tested by that method.
Cold treatment is also known as sub–zero treatment or deep freezing. Machine Repairs June 17, The formula for calculating the volume density, N Vfor each range N V j is then:. Linear elastic fracture mechanics is a field developed in the solid mechanics and materials agm communities , .
This paper has illustrated how statistically robust inclusion gama data, gathered with SEM automated image analysis, can generate the statistically rich data needed to robustly consider design concerns.
See figure 9 for a photomicrograph of intergranular oxides black constituent.
Metallography – Performed at a magnification of — diameters. 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.
Maximum allowable depth in root inch mm 0. Similarly, if the same automotive ring gear is determined to have 0.
AGMA B05 – Metallurgical Specifications for Steel Gearing
When a solid body is subjected to stress, and there is a crack or a flaw, such as an inclusion, the stress is concentrated in the vicinity of the flaw. G H representative test coupon: The total case depth for induction or flame hardened gearing is usually assumed to be the same as the hardened and effective case depths. Further evaluation at higher magnifications shown in the progression of pictures moving forward to the right shows a fatigue thumbnail, and in the middle of the thumbnail is a globular oxide micro inclusion that measures approximately 20 mm in square root area.
Decarburization is indicated by a lower converted hardness for the lighter load compared to that from the heavier load, presuming that proper 923b-05 testing techniques were used for both sets 923-h05 tests. The bending strength of gear teeth related to their resistance to gear tooth bending failure.
For induction or flame hardened gearing, unless otherwise specified, the effective case depth is 4 Procedures 4. Each individual characteristic has the same item number in tables 1, 2, 3 and 4 whenever it is used, regardless of which table it appears.
Grain size Predominantly 5 Predominantly 5 or finer. 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. If the material selected has adequate hardenability agms the required hardness and section size combination, this surface hardness represents the expected hardness at the intersection of the root circle and the centerline of the tooth at mid–face width.
Method 2 — Combustion The combustion method utilizes chips from a machining cut of 0. The minimum inscribed diameter on a test disc or plate dimensions should be ama times its thickness. A microstructural constituent consisting of lamellar ferrite and cementite resulting from the transformation of austenite at temperatures above the bainite range. The microstructure in this zone should be predominantly tempered martensite that is free of blocky ferrite, pearlite, and measurable bainite observable at X.
Individual customers and manufacturers may have specific modifications to the metallurgical grade requirements or special material and processing conditions that are not covered in these tables. Alternative method of inspection is case hardness.