AGMA B Metallurgical Specifications for Steel Gearing. standard by American Gear Manufacturers Association,. View all product details. Most Recent . 8 Aug AGMA B05 – Metallurgical Specifications for Steel Gearing/钢制齿轮冶金技术 条件. AGMA Metallurgical Specifications for Steel Gearing. AGMA Revision B05, May 3, Complete Document. Metallurgical Specifications for Steel.
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If it is determined that inclusions greater than 10 mm represent a risk for failure at stress levels exceeding MPa, then the gear agma b05 engineer can assess the design and determine what volume of gear is exposed to principal stresses of MPa and higher.
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. Figure 10 illustrates the test procedure for atma a LEFM crack growth rate test . TimkenSteel can produce any of its grades to this new steel micro-cleanness standard.
Proceed to Checkout Continue Shopping. Figure 2 shows an example of a Z-contrast SEM image of 9233-b05 in steel. 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 analysis 923b05.
Suggestions for improvement b this standard will be welcome. When high-energy electrons from the electron beam strike the sample, some of the inner-shell electrons contained in the elements of the sample may be excited to a higher-energy shell, leaving an electron 92-b05 in the inner shell. The Y lim value agms the extrapolation is calculated based on the return period, T, and the relevant areas as follows:.
Gear Design Relevant Cleanness Metrics | Gear Solutions Magazine Your Resource to the Gear Industry
From this work, they determined that the stress intensity was related to the square root area of the defect in the afma 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:. Abma each case, the Z-contrast of these particles against the steel matrix makes them readily detectable.
If the particle agma b05 in proximity to other particle s such that they meet the standard criterion for stringers, then the agma b05 is categorized and n05 as a stringer inclusion.
Oxide particles in steel typically consist of aluminum, magnesium, calcium, or silicon oxide compounds or phases. The reduced variate is calculated as follows:. The fatigue performance axis in these wgma is based on the average maximum agma b05 observed in each of the Monte Carlo sets. Quantity must be a positive whole number.
If that volume stressed in excess of MPa is determined to be 0.
AGMA B05 – Metallurgical Specifications for Steel Gearing
Strength and quality of materials ISO The formula for calculating the volume density, N Vfor each range N V j is then:. Industry standards for steel cleanness.
As noted previously, macro stringer inclusions are typically an order of magnitude less frequent than globular oxides and therefore much less likely to be in a agma b05 area compared to one or more critically sized globular oxides.
This process is repeated for each stringer inclusion type A, B, C. All standards are subject to revision, and parties to agreements based on this document are encouraged to investigate the possibility of applying xgma most recent editions of the standards shown below.
At this time, the Ultrapremium practice and certification limits with steels are produced using bottom-poured ingots. Heat treating low alloy PM steels October 15, You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.
These analytical techniques and their resulting outputs are described in the following two sections. Thursday, November 8, The Ultrapremium practice for its strand cast process path is under development. The Saltykov method assumes that the features being addressed are all spherical. Future of gear design relies on overcoming present. You may delete a document from your Alert Profile at any time.
Monte Carlo simulations were run comparing Ultrapremium to SBQ 1 and SBQ 2 in order to assess the potential for light weighting Figure 12 or increased torque capacity Figure 13 while maintaining fatigue performance. In this method, the three-dimensional distribution of spheres agma b05 approximated by first dividing the two-dimensional frequency per unit area, na, data in to K discrete size sets of integer aagma between 7 and The statistics of extreme values SEV can be used to predict the single largest inclusion likely in the steel, enabling the gear design engineer to consider the worst-case inclusion.
Gear Design Relevant Cleanness Metrics
The reduced variate is a log-log measure of the accumulated inspected area over the set of extreme value samples. Steels rated with this method and meeting the AGMA grade 3 requirements can have very different inclusion populations when examined more closely. Next, a measure of the accumulated inspected area for each of the rank ordered samples, described as the reduced variate, Y, is agma b05 at each j value.
Suggestions for improvement of this standard will be welcome. The Agma b05 information sheet on steels for gears requires that oxide agma b05 ratings meet certain limits in order to meet grade 2 or 3 gear steel quality requirements. The volumetric inclusion concentration can be considered against the stressed volume agma b05 a gear, and the probability of encountering a critically sized inclusion in a gear or a population agma b05 gears can be estimated. At the time of initial development, the editions shown were valid.
In the laboratory, one can apply known cyclic stress intensity to a crack and evaluate the threshold stress intensity, K thor the minimum stress intensity required to begin to drive crack growth. 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.
Z-contrast facilitates the automated identification of oxide particles in a steel matrix as a result of the significant difference between the atomic number of iron, with an atomic number of 26, and oxygen, with an atomic number of 8. As such, these data alone have great utility in identifying steel sources that can meet the cleanness requirements demanded by highly loaded, power-dense transmission systems.
The presence of hard oxide inclusions can result in fatigue failures.