Chapter5_salloys+s

Chapter5_salloys+s - Chapter 5 Superalloys and Specialty...

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Chapter 5 Superalloys and Specialty Steels
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uggested Reading Suggested Reading ERO3700 Course Pack p. 161- 68 AERO3700 Course Pack p. 161 168 • Callister: p. 364-365, 380
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etals in an Aero Engine Metals in an Aero Engine • Boeing 757 g Turbofan • 38% Ti • 37% Ni* • 12% Cr* • 6% Co* thers Others PW 2037 Turbofan
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efinition of Superalloys Definition of Superalloys •S u peralloy is a term given to materials which exhibit far greater strength in the 800 - 1100°C range than do conventional alloys. lassifications: i- ased Ni- e based or Co- ased Classifications: Ni based, Ni Fe based or Co based • Contain large amounts of alloying elements: e.g., Cr, Co, Mo, Al, W, Ti. Strengthening is by solid solution strengthening, precipitation hardening or dispersion hardening. u peralloys are frequently cast (why?)
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uperalloys are important in high- Superalloys are important in high temperature applications. They are also ferred to as temperature- sistant alloys referred to as temperature resistant alloys or high-temperature alloys. ajor applications of superalloys: • Major applications of superalloys: – jet engines – gas turbines – reciprocating engines – rocket engines – tools and dies for hot working of metals.
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xamples of Superalloys in Aeroengines Examples of Superalloys in Aeroengines iner: Hastelloy X Liner: Hastelloy X • Combustor: Haynes 230 • Turbine blade: IN 738, PWA 1484 • Turbine housing: IN 718 • Flaps: René 41 Terminolgy in textbootks uses: Ni based, Ni Base, and Ni-Based. The terms are interchangeable.
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Trade Names and the Unified Numbering System (UNS) i- ased superalloys have Ni from 38- 6 Ni based superalloys have Ni from 38 76 w/o and also up to 27 w/o Cr and 20 w/o Co rade names include: Hastealloy (and • Trade names include: Hastealloy (and Haynes), Inconel, Nimonic, René, Udimet, stroloy Waspaloy Astroloy, Waspaloy • Ni-Fe based have names such as Incoloy • With all of these trade names it is easy to see why the UNS came into being.
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UNS Basics Axxxxx A l and Al alloys AA2024 -> A92024 Cxxxxx C u and Cu alloys Dxxxxx steels D esignated by mech props Exxxxx Rare E arth and rare earth-like alloys Fxxxxx Cast irons (F e) Gxxxxx AISI/SAE carbon and alloy steels 1020 (0.2 w/o C, range .17 - .23) isG10200 Hxxxxx AISI H -steels Jxxxxx Cast steels Kxxxxx miscellaneous steels & ferrous alloys
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Lxxxxx L ow melting alloys and metals Mxxxxx M iscellaneous nonferrous metals & alloys Nxxxxx N i and Ni alloys Pxxxxx P recious metals and alloys Rxxxxx Reactive & Refractory metals & alloys yy Sxxxxx S tainless steels, valve steels, superalloys xxxxx ol steels Txxxxx T ool steels Wxxxxx W elding filler metals xxxxx and Zn alloys Zxxxxx Z n and Zn alloys
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UNS for superalloys • UNS numbers begin with NXXXXX, see Table g, 13-40, p. 165 • Typical Ni alloys for high corrosion resistance and/or high temperature resistance use N02XXX and N03XXX • Monels – N05XXX are Cu-Ni alloys with about 60 w/o Ni and 40 w/o Cu (+ small A, Ti) ave high strength corrosion resistance and have high strength, corrosion resistance, and temperature resistance. They will precipitation harden (Ni Al, Ni Ti) and resist overaging to 3 3 425°C
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This note was uploaded on 11/13/2011 for the course CIVE 2*** taught by Professor - during the Spring '11 term at Carleton CA.

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Chapter5_salloys+s - Chapter 5 Superalloys and Specialty...

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