zr1nsx
Aluminum
- Joined
- Dec 31, 2007
- Location
- indianapolis
I have some questions about heat treatment of 4130 and brittleness. I have a component (shaft with keyway and thread) that I make which we heat treat to Rockwell 45C and do some finish machining after heat treatment. After approximately 1000 pieces I have had a few pieces break and am curious about hardness versus brittleness. I want a tough surface for wear, but I don't want it to crack or become brittle. Perhaps there is a better material for the application. 45 isn't very hard, but does provide some resistance to scratching and galling. Anyone have any experience with the working threshold of 4130?