First I’ll start by saying I have successfully heat treated 25ish blades mainly A2 and D2. I I decided to give CPM-D2 a try so I ground 2 blades from 1/8” precision ground stock. I decided to try my normal D2 recipe. After completing my temper cycles I decided to start working on the finish grinding. I use a 100lbs magnet to flat grind the blade against my flat platen. When I stuck the blade to my magnet it fell on the floor. I was little dumbfounded so I though that something was wrong with the magnet so turned and stuck it to the side of my grinder and it practically jumped from my hand. Magnet was fine. I then tried to stick it to both blades and they both barely stuck to the magnet. Has anyone ever experienced this? Any idea on the cause?
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CPM-D2 Heat Treat...unusual results?
- Thread starter TexMac
- Start date
You have an excessive amount of retained austenite usually caused by too high aus temp.
Wrap balde in ht foil, heat to 1350 for 4 hours, air cool to room temp, reharden blade at 1875f, sub zero or cryo quench, temper.
Make sure it is D2.
Hoss
Wrap balde in ht foil, heat to 1350 for 4 hours, air cool to room temp, reharden blade at 1875f, sub zero or cryo quench, temper.
Make sure it is D2.
Hoss
Last edited:
Thank you for the info. I feel confident that the material is CPM-D2 and was magnetic pre -HT. I’ll check my thermocouple it could be off. I quenched at 1835 and then sub-zero for a couple hours. I have no idea the hardness other than a file skated cleanly.