Machanical properties of casting and forging
Machanical properties of casting and forging
(OP)
I am looking for to learn more about the mechanical properties of comparison of casting and forging method.
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Machanical properties of casting and forging
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RE: Machanical properties of casting and forging
RE: Machanical properties of casting and forging
RE: Machanical properties of casting and forging
RE: Machanical properties of casting and forging
RE: Machanical properties of casting and forging
RE: Machanical properties of casting and forging
RE: Machanical properties of casting and forging
Both techniques are developed to get a near net shaped part, but that is where the similarity ends.
A very common analogy is the bread dough. If you just mix the bread flour and water, and bake it, the bread is very brittle and crummbles easily.
On the other hand, if you knead the dough for a long time, you end up with a chewy bread.
The forged parts will usually have a better mechanical properties such as strength, fatigue properties etc. It will also be lower on porosity, inclusions etc.
The other problem with cast structure is something called as "coring" or "segregation". In addition, in case of castings, there is a very distinct property gradient. The dendrites have different properties and chemistry as compared to the interdendritic regions.
Some of these can be eliminated by heat treament and modified casting processes such as pressure die casting and use of chilling.
Even with this, in most cases, the forged part will be considerably better when compared to a cast part.
RE: Machanical properties of casting and forging
RE: Machanical properties of casting and forging
Somuch on the benefits of forging over casting. One point to note is the aspect of anisotrophy, the differences in the properties in the direction of forming and across. In perticular, the ductility properties viz. reduction in area, which is affected significantly. Whereas the casting has no anisotrophy at all, forging is a prisoner to this effect. This level of anisotrophy is dependent on the type and the level of impurity, the extent of working.
If one has to deal with HIC resistance, if the product is a casting there is cosiderable less problem, than what is called for a wrought product.
Regards,
MRCN
RE: Machanical properties of casting and forging
Advantages of forging and casting over extrusion
Thread367-44636
There, I essentially agreed with the answers above by EnglishMuffin on the forged grain structure being superior for applied stresses, and by mdighe on the segregation problem of castings. Although priyasachin claims that castings are isotropic, this is never entirely true since it takes a finite time for the heat of solidification to flow somewhere. Consequently, grain growth and segregation occur. Non-anisotropy isn’t necessarily a benefit either: in a functionally shaped forging, the grain structure becomes aligned to optimally resist applied loads. And, in castings, reinforcing ribs are generally anisotropic per design.