With reference to forging, what is a simple explaination of the term "grain-flow"?
This is homework question, so no really complex answers, please :)
Answers:
metal is made up of tiny particals that are in whatever direction they feel like, IE (- / \ \ / ---), making a weak bound. Forging pulls these metal grains to roughly the same direction, IE ( ---------), causing it to be stronger.
Metals have a crystalline grain structure. When you forge a part, you use heat and pressure to change the shape of the metal. The result, due to pressure, is that this grain structure is "flattened" creating a non-homogeneous grain structure. the grains are compressed - therefore they "flow" due to the pressure forces on them, creating a directional grain pattern
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Answers:
metal is made up of tiny particals that are in whatever direction they feel like, IE (- / \ \ / ---), making a weak bound. Forging pulls these metal grains to roughly the same direction, IE ( ---------), causing it to be stronger.
Metals have a crystalline grain structure. When you forge a part, you use heat and pressure to change the shape of the metal. The result, due to pressure, is that this grain structure is "flattened" creating a non-homogeneous grain structure. the grains are compressed - therefore they "flow" due to the pressure forces on them, creating a directional grain pattern
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