Cast v forged?
Casting creates a structure inherently weaker than forging.
When casting the structure forms due to cooling. It can be influenced slightly by including chill sections in the mould resulting in faster cooling where these pull out the heat quicker. This influences the crystal structure shape/size where beneficial.
Forging changes the structure by “pushing” the internal structure ( other effects also). It can create a (fibrous” structure -think of comparing a dead branch versus a green living branch. Brittle versus tougher.
Repair of damage. Can be very complex involving heat management to maintain structural integrity and form, introducing extra stresses if no subsequent stress relief. It can become very complex!
Cracked wheel? Weld it? With what? Stress relief?
Be wary!
