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These are the specs right off the HT certs. Degrease, 1925 deg. 1.5 - 3 hrs, Argon, Oil 60 - 160 deg., -90 deg. or lower, 3 hrs. 675-775 deg.,3 hrs. Air 675-775 deg.3 hrs., air rem oxide, HRC 52-56 Actual HRC 54-55 I think next time I will try Crucibles material and perhaps another heat treat...

We have not done a micrograph exam of the structures as yet. I am considering trying a different material that may have a more uniform microstructure than 440C. This part is used in manufacturing medical devices (corosion resistant) and needs to be very stable to hold shape during the EDM...

This may be a little late but maybe you can put a small ring of Nickle between the SS and the Ti.as you can weld Nickle to both Ti. and SS.

Let me clear this up a bit. I am assuming the cracks are happening during EDM. I have a 4.5" dia X 2.5 " blank that 9 curved pieces are being cut from. The shape is critical thus they are cut after heat treat. I have an outside shop doing the EDM. They rough cut all the pieces then do all of the...

I have some parts wire edm cut from a round blank of 440C. The material is hardened to 52-56 HRC per AMS 2759/5 type 3 with sub zero cooling. The certs say it is 54-55 HRC. During the edm process the tips of my part tend to crack. This has only occurred twice out of many parts, but since it...