Design and characterization of novel precipitation hardenable high Cr Ni-based superalloys

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Abstract

Among the Ni-based superalloys, Alloy 718 stands apart with the ability to be precipitation hardened after welding, by the slow formation of nano-scale γ’’ (Ni3Nb) particles. This slow formation gives it a very low crack susceptibility, which has made it widely applied since its introduction in the aircraft industry in the 1960’s. Five powder metallurgical Ni-based superalloys containing 35-45 wt % Cr and 4-6 wt % Nb were designed with the aim of maintaining the hardening mechanism found in Alloy 718, while drastically increasing the hot corrosion resistance. The alloys were manufactured and the actual precipitation of γ’’ was verified with TEM. The mechanical properties of the hardened P/M alloys are comparable to those of Alloy 718.
Original languageEnglish
JournalProceedings of the Risø International Symposium on Materials Science
Volume33
Pages (from-to)201-207
ISSN0907-0079
Publication statusPublished - 2012
Event33rd Risø International Symposium on Materials Science: Nanometals - Status and Perspective - DTU Risø Campus, Roskilde, Denmark
Duration: 3 Sep 20127 Sep 2012

Conference

Conference33rd Risø International Symposium on Materials Science
LocationDTU Risø Campus
CountryDenmark
CityRoskilde
Period03/09/201207/09/2012

Bibliographical note

Proceedings of the 33rd Risø International Symposium on Materials Science : Nanometals - Status and Perspective

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