I think you meant precipitation hardening. The article mentions that they can 3d print material that has a similar structure to 17-4 PH steel, with similar str

I think you meant precipitation hardening. The article mentions that they can 3d print material that has a similar structure to 17-4 PH steel, with similar strength properties. They aren't specifically heat treating while printing, they're effectively printing heat treated material. So I think you're right that it won't be 17-4 PH. It sounds like it could be just as strong without the need for heat treating. That's pretty cool.