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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. The hydrogen can be generated during cleaning or plating processes or the exposure of cathodically protected steel parts to a service environment including? The combined residual and applied stress above which time-delayed fracture will occur?
Historically, time-to-failure sustained load tests have been conducted to determine the threshold stress. The run-out time can be as long as four to? This standard provides an accelerated method to measure the threshold stress or threshold stress intensity for the onset of hydrogen stress cracking in steel within one week on only one machine.
This method can be used to determine rapidly the effects of residual hydrogen in a part caused by processing or quantify the relative susceptibility of a material under a? For precracked specimens, the threshold stress intensity as de? It does so by measuring the threshold for the onset of subcritical crack growth using standard fracture mechanics specimens, irregular-shaped specimens such as notched round bars, or actual product such as fasteners 2 threaded or unthreaded springs or components as identi?
Current edition approved Sept. Originally published as F — Last previous edition F — The values stated in metric units may not be exact equivalents. Conversion of the U. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Prevention and Control, 3. Pth is the basis for calculating the threshold stress or the threshold stress intensity. Summary of Test Method 4.
This condition is used to simplify the calculation of stress or stress intensity for an irregular cross section.
While the displacement is held constant, the onset of subcritical crack growth is detected when the load decreases by a predetermined amount.
This test method quantitatively measures stress parameters that are used in a design or failure analysis that takes into account the effects of environmental exposure including that f1264 occurs during processing, such as plating 6 ASTM STP The imposed potential is typically cathodic, ranging from 0.
Rapid Hydrogen Embrittlement Testing per ASTM F, F, and F
NOTE 1—Apparatus, grips, load adapters, and environmental chambers that have been found to meet the standard are available from Fracture Diagnostics, Inc. BoxDenver, Co The product shall be tested either substantially full size or as a machined specimen. In no case should the loading rate be faster than that of the previous sample. This load sequence will continue until a signi?
It is suggested that the duration be doubled, at least at values in excess of 0. The procedure shall be continued until an invariant value Pth is obtained. The load at which subcritical crack growth occurs is detected by a signi?
Testing shall be continued until crack growth is detected or rupture occurs. For astk with a hardness of 48 HRC or greater, an 8-h step-loading pro? For steels less than 48 HRC, a h step-loading pro?
Sampling and Test Specimens 7. For manufacturing control, loading rates shall be? For other quality assurance tests, the sampling size shall be in compliance with the requirements of the speci? Interested parties are invited to submit information regarding the identi?
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Fractographic analysis may be used to verify the existence of subcritical cracking. These values are not necessarily the same. Fracture mechanics-type specimens with speci?
Irregular geometry type specimens are classi? NOTE 3—When testing irregular geometry type specimens, note that the test results are geometric speci?
The load is de? Precision and Bias The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
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