Need to test a pin for brittleness.
Need to test a pin for brittleness.
(OP)
I have two lots of .059x.972in. pins made from 52100 steel. Both tempered to RC58. One lot bends almost 90deg., with pliers, before breaking. The other snaps like glass at 5-10 degrees of bend.
I need a standardized test to perform post heat treatment to test for brittleness. I was thinking some kind of shear or impact test would be quick and cheap.
I need a standardized test to perform post heat treatment to test for brittleness. I was thinking some kind of shear or impact test would be quick and cheap.





RE: Need to test a pin for brittleness.
Set the pendulum to swing the same distance for each test and strike the pin at the same location on each pin. The weight and striking face of the pendulum would always be the same.
RE: Need to test a pin for brittleness.
RE: Need to test a pin for brittleness.
If you are near a University library, I'm sure you can get all of this free.
Ron
RE: Need to test a pin for brittleness.
An alternative method is use Edddy currents to sort the material on conductivity.
What sort of heat treatment has the part had?
RE: Need to test a pin for brittleness.
Why would you austemper in salt vs. temper in oil? Austempering preserves ductility. I'm getting a sample ran now to test my hypothesis. I will still need a test method. I am leaning toward supporting the pin on the ends and applying force to the center until failure.
RE: Need to test a pin for brittleness.
As I said before Eddy currents would very easily do the job and you can then reheat the failed parts.
RE: Need to test a pin for brittleness.