Black Jet

that forged are generally lighter and cast are stronger, is that right?

Fluffhead

forged are lighter and stronger...cast are cheaper

ToblertheDog

Strength of forging:

- Good Mechanical properties (yield strength, ductility, toughness)
- Reliability (used for critical parts)
- No liquid metal treatment
- Weight savings

Weakness of forging:

- Defects
- Laps
- Die unfill
- Die failure
- Piping
- Shape limited when undercuts or cored sections are required
- Overall cost usually higher than casting
- Multiple steps often required

Strength of casting:

- Large and complex parts
- High production rate
- Design flexibility

Weakness of casting:

- Defects
- Shrinkage porosity
- Metallic projections
- Cracks, hot tearing, cold shuts
- Laps, oxides
- Misruns, insufficient volume
- Inclusions
- Requires close process control and inspections (porosity may occur)

BergeyRPI

Small clarification, because forged is stronger, they can (and usually do) make them lighter.