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Components HP and IP – Rotor – Diaphragm – Blades/Nozzles – Casing LP – Rotor – Diaphragm – Blades/nozzles
List of Potential Materials HP, High T, Static and Dynamic Inconel 617 Inconel 625 Inconel 718 Inconel 740 Nimonic 105 Nimonic 115 Nimonic 263 Haynes 230 Haynes 282 U700 U710 U720 Waspaloy ODS-FeCrAl
Phase 1 – Disqualifying Factors HP Components–Rotor, diaphragm, casing Weldability (Ti+Al )< 2.5 Yes - Inconel 617, Inconel 625, Inconel 718, Haynes 230, Inconel 740, Nimonic 263 No U720, Waspalloy, Nimonic 105, Nimonic 115, Haynes 282 Larson-Miller Parameter >25k Yes - Inconel 617, Inconel 740, Nimonic 263 No - Inconel 625, Inconel 718, Haynes 230 Machinability Yes - Inconel 617, Inconel 740, Nimonic 263
Phase 2 - Performance Ranking HP/IP Rotor, Diaphragm and Casing MaterialYield Strength (Mpa) Cost ($/lb) $/ y (x100) Oxidation Rank Inconel Inconel Nimonic
Phase 1 – Disqualifying Factors HP Components – Blades Weldability N/A Larson-Miller Parameter >25k Yes - Inconel 617, Inconel 740, Nimonic 263, Nimonic 105, Nimonic 115, U720, Waspaloy, Haynes 282 No - Inconel 625, Inconel 718, Haynes 230 Machinability Yes - Inconel 617, Inconel 740, Nimonic 263,Nimonic 105, Nimonic 115, Waspaloy, Haynes 282 No – U720
Phase 2 - Performance Ranking HP Blades MaterialYield Strength (Mpa) Cost ($/lb) $/ y (x100) Oxidation Rank Inconel Inconel Nimonic Nimonic Nimonic Waspaloy Haynes
List of Potential Materials LP Components Ti A MA
Phase 1 – Disqualifying Factors LP Components Weldability (Ti+Al )< 2.5 Yes – 304, 316Ti, 253MA, A286 Larson-Miller Parameter N/A Machinability Yes – 304, 316Ti, 253MA, A286
Phase 2 - Performance Ranking LP Rotor, Diaphragm and Blades MaterialYield Strength (Mpa) Cost ($/lb) $/ y (x100) 316Ti Stainless Stainless MA A
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