17-7 HP microstructure
17-7 HP microstructure
(OP)
Hi, I would like to know some literature about 17-7 alloy. We have a 17-7 HP spring that failed due to cracks. I am not sure if the heat treatment done was correct because I can visualize the inclusions using optical microscope (x100). The composition inclusion is Al end Fe and their shape are angulars. I am not sure if these kind of precipitation is regular.





RE: 17-7 HP microstructure
There is a handbook for 17-7PH published by Armco back in the day.
It only has a few micros, but it should be helpful.
One thing to do is check for surface damage. There are a number of things that can cause this (Heat treat gases, cleanliness, secondary treatments).
Get me your email and I'll send a scan of the handbook.
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P.E. Metallurgy, Plymouth Tube
RE: 17-7 HP microstructure
Follow the thread, the Armco 17-7 PH handbook can be downloaded.