Can anyone suggests a good reliable source for fatigue life of 17-4ph H1025?
Can anyone suggests a good reliable source for fatigue life of 17-4ph H1025?
(OP)
I am trying to find an S-N curve and/or the strain-life curve of 17-4ph h1025.
I found the data for high temperatures on the AMS website but nothing at room temperature. That is strange, I believe if it is tested at high temperature than there should be some reports available for room temperature fatigue life. Please lead me to the source.
Thank you
I found the data for high temperatures on the AMS website but nothing at room temperature. That is strange, I believe if it is tested at high temperature than there should be some reports available for room temperature fatigue life. Please lead me to the source.
Thank you
RE: Can anyone suggests a good reliable source for fatigue life of 17-4ph H1025?
Caution, with 17-4PH the actual strength, original material size, and sample orientation are all important.
So how the material was made. Most 17-4PH is air melted, but it is available as re-melted product that has much higher toughness and fatigue properties (especially transverse).
The toughness and fatigue properties of 17-4PH start dropping off above 1" thick, and tank above about 4" (this is why 15-5PH exists).
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P.E. Metallurgy, consulting work welcomed
RE: Can anyone suggests a good reliable source for fatigue life of 17-4ph H1025?
Any help will be appreciated.
Thanks
RE: Can anyone suggests a good reliable source for fatigue life of 17-4ph H1025?
This is an alloy that for aerospace work prohibits the cutting of plate to make bar. With plate you have three directions; L - longitudinal, this is the rolling direction; T - transverse (more accurately LT long transverse) which is the width of the plate; and ST - short traverse, which is the thickness.
If they started with a thick piece of stock and machined a smaller part of of it then both orientation and location within the raw material could play a roll.
The toughness and fatigue properties will be descending in that order as well.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
RE: Can anyone suggests a good reliable source for fatigue life of 17-4ph H1025?
Below are S-N curves from MMPDS for notched 17-4 PH cond H1025 bar, which may differ from your case. These curves are for AMS 5643 which is air melt quality material. AMS 5622 is a vacuum melt quality form of the same material, and would have better fatigue performance as EdStainless noted.
Hope that helps.
RE: Can anyone suggests a good reliable source for fatigue life of 17-4ph H1025?
Thanks