What is the major limitation of the superplastic forming of sheet metal?(TWO QUESTIONS)?

1. What is the major limitation of the superplastic forming of





sheet metal?








2. What are some of the more attractive features?What is the major limitation of the superplastic forming of sheet metal?(TWO QUESTIONS)?
1) Only some metals will SPF and it is expensive compared to standard sheet forming





2)


i) Low stresses during forming


ii) Complex shapes are possible


iii) SPF does not drastically reduce the cross section in corners

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