Question

pressed and sintered Ti6Al4V is of 98% density, while hot isostatically pressed Ti6Al4V has density of at least 99%. What fundamental mechanisms may be responsible for the higher density achievable by HIP? Consider the pressed + sintered route. Investigate: For this alloy, what pressure is used during pressing? What temperature and time at temperature are used during sintering? The density of the sintered (fired) compact is 98%. If the linear shrinkage during sintering is 2%, what should be the density of the pressed (green) compact?

Answer 1

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  Pressed and sintered alloys undergo excess structural integrity without the application of the external temperature which leaves the blank spaces decreasing the density of the alloy . T he structural integrity regarding the process of sintering mainly ranges between 400 to 800 degree C .
• In HIP the temperature is the main factor affecting the density which in turn increases the density by modification of its microstructure as and during the process of Pressing and sintering.
• Thus the density difference causes is due the high temperature which is used during the process, The density ranges fro 98.3 to 98.6 as and during the pressing and sintering process.
• The highest possible density is achieved by the temperature and there is a major structural change involved affecting the density.

• For 98.3 to 98.6 the green compact strength is nearly 750 Mpa
  • The density should be around 98 to 99, with linear shrinkage of two percent