PM: Sponge iron vs. Atomized powder

[BrotherJohn]

Hi All,
I am trying to evaluate the difference between Sponge iron and atomized powders. The MPIF Standard 35 for F-0000-10
shows a hardness of 40 HRF and a Fatigue Limit 90% Survival of 46 MPa @ a density of 6.1 g/cc. These numbers are in line with with our measurements for Sponge iron powders. But when an atomized powder of the same chemistry is used the hardness goes down to 17 HRF @ a density of 6.7 g/cc. Based on everything I have read the fatigue properties should improve due to increased density. Would you agree? Also is there any concerns with green state strength with atomized?
Thanks in advance,

Brother John

 

[EdStainless]

Neither of these products is 100% dense, I am not sure what a hardness would mean. It would be related to how the particles are stuch together and not to the strength of the material.
You need to measure some macro properties such as compressive strength or impact strength.

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Manage it or it will manage you.

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[unclesyd]

The information at the granddaddy of iron powders site should give you enough information to get going. they have plethora of information.

http://www.hoeganaes.com/navpages/techlib_by_categ.htm