Heat treatment method for bodies that comprise a nickel based superalloy
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United States of America Patent
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Jul 11, 2006
Grant Date -
Mar 18, 2004
app pub date -
Nov 5, 2002
filing date -
Nov 9, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a heat treatment process for a single-crystal or directionally solidified material body comprising a nickel-based superalloy, the material body is solution-annealed and then at a first temperature .gamma.' particles of greater than 1 .mu.m are precipitated in a proportion by volume with V.sub.tot-V.sub.1 of less than 50%, where V.sub.tot is the total amount of .gamma.' particles after complete heat treatment and V.sub.1 is the proportion of the .gamma.' particles which is greater than 1 .mu.m, and at least at a second temperature `.gamma.` particles of less than 1 .mu.m are precipitated. The .gamma.' particles are preferably precipitated in a size of 2 pin or more with a proportion by volume of 0.25<(V.sub.tot-V.sub.1)/(100-V.sub.1)<0.55 at the first temperature. The proportion by volume V.sub.tot of the .gamma.' particles will be at least 50%.
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