Alloy Design of Nickel-base Solid Solution Strengthened Superalloys
1976; Volume: 16; Issue: 9 Linguagem: Inglês
10.2355/isijinternational1966.16.513
ISSN1881-1183
AutoresRikizo Watanabe, Yoshitaka CHIBA, Tsuneo Kuno,
Tópico(s)Intermetallics and Advanced Alloy Properties
ResumoAn alloy design has been conducted with respect to nickel-base solid solution strengthened alloys in order to develop an intermediate heat-exchanger material for very high temperature gas cooled reacto r,.they are required to possess a creep rupture strength higher than 1 kg /mm' at 1 OOO°C-IO' hr and a workability good enough for forming to tubes .17 1 p romising austenitic compositions have been extracted from about 17000 compositio ns in the Ni-Co-Cr-M o-W sy stem through a theoretical analysis .Seven of the theoretically promising austenitic compositions are examined ex/mimentally and 16Cr-20W-30Co (Bal.Ni ) is finally selected as the best austenitic composition .The e./fects of small additions of boron , z irconium and y ttrium have been examined , and z irconium is selected as the best alloying element for grain boundary strengthening.Further, the effects of aluminum addition and grain si::e have been examined and it is confirmed that aluminum is detrimentaL from internal oxidation /Joint of view and that grain si::e of about No. 2 seems to be adequate.I n conclusion, an alloy consisting of 0.05°o C , 16°" Cr , 20"" \Y , 30 ~o Co, 0.5% T i , 0.05°0 Zr and BaL.i is selected as the most promising alloy to meet the requirement.
Referência(s)