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

Uffe Bihlet; Kristian Vinter Dahl; Marcel A. J. Somers

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

Uffe Bihlet, Kristian Vinter Dahl, Marcel A. J. Somers

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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 language	English
Journal	Proceedings of the Risø International Symposium on Materials Science
Volume	33
Pages (from-to)	201-207
ISSN	0907-0079
Publication status	Published - 2012
Event	33rd Risø International Symposium on Materials Science: Nanometals - Status and Perspective - DTU Risø Campus, Roskilde, Denmark Duration: 3 Sept 2012 → 7 Sept 2012

Conference

Conference	33rd Risø International Symposium on Materials Science
Location	DTU Risø Campus
Country/Territory	Denmark
City	Roskilde
Period	03/09/2012 → 07/09/2012

Bibliographical note

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

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title = "Design and characterization of novel precipitation hardenable high Cr Ni-based superalloys",

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{\textquoteright}{\textquoteright} (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{\textquoteright}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{\textquoteright}{\textquoteright} was verified with TEM. The mechanical properties of the hardened P/M alloys are comparable to those of Alloy 718.",

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author = "Uffe Bihlet and Dahl, {Kristian Vinter} and Somers, {Marcel A. J.}",

note = "Proceedings of the 33rd Ris{\o} International Symposium on Materials Science : Nanometals - Status and Perspective; 33rd Ris{\o} International Symposium on Materials Science : Nanometals - Status and Perspective ; Conference date: 03-09-2012 Through 07-09-2012",

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AU - Bihlet, Uffe

AU - Dahl, Kristian Vinter

AU - Somers, Marcel A. J.

N1 - Proceedings of the 33rd Risø International Symposium on Materials Science : Nanometals - Status and Perspective

PY - 2012

Y1 - 2012

N2 - 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.

AB - 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.

KW - Lette stærke materialer til energiformål

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SN - 0907-0079

VL - 33

SP - 201

EP - 207

JO - Proceedings of the Risø International Symposium on Materials Science

JF - Proceedings of the Risø International Symposium on Materials Science

T2 - 33rd Risø International Symposium on Materials Science

Y2 - 3 September 2012 through 7 September 2012

ER -

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

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