Transcript Materials Selection Process

Components
• HP and IP, High T
–
–
–
–
Rotor
Diaphram
Blades/Nozzles
Casing/Steam Chest
• LP, High T
– Rotor
– Diaphram
– 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 and Casing
Weldability
(Ti+Al )< 2.5
Larson-Miller
• Yes - Inconel 617, Inconel 625, Inconel 718, Haynes 230, Inconel 740, Nimonic 263
• No - U700, U710, U720, Waspalloy, Nimonic 105, Nimonic 115, Haynes 282 ODSFeCrAl
• Yes - Inconel 617, Inconel 740, Nimonic 263
• No - Inconel 625, Inconel 718, Haynes 230
Parameter > 25
• Inconel 617, Inconel 740, Nimonic 263
Machinability
Phase 2 - Performance Ranking
Rotor and Diaphragm
Material
Yield Strength
Oxidation x 10
Cost x - 5
Total
Inconel 617
283
8
10.70
309.5
Inconel 740
608
10
10.70
654.5
Nimonic 263
630
6
11.39
633.05
Phase 2 - Performance Ranking
Casing
Material
Yield Strength
Oxidation x 5
Cost x - 10
Total
Inconel 617
283
8
10.70
216
Inconel 740
608
10
10.70
551
Nimonic 263
630
6
11.39
546.1
Phase 1 – Disqualifying Factors
HP Components – Blades
Weldability
• N/A
N/A
Larson-Miller
Parameter > 25
Machinability
• Yes - Inconel 617, Inconel 740, Nimonic 263, Nimonic 105,
Nimonic 115, U720, Waspaloy, Haynes 282
• No - Inconel 625, Inconel 718, Haynes 230
• Yes - Inconel 617, Inconel 740, Nimonic 263,Nimonic 105,
Nimonic 115, U720, Waspaloy, Haynes 282
• No – U720
Phase 2 - Performance Ranking
HP Blades
Material
Yield Strength
Oxidation x 10
Cost x - 10
Total
Inconel 617
283
8
10.70
256
Inconel 740
608
10
10.70
601
Nimonic 263
630
6
11.39
576.1
Nimonic 105
690
x
11.36
576.4
Nimonic 115
690
x
11.36
576.4
Waspaloy
650
5
10.30
597
Haynes 282
614
6
10.35
570
List of Potential Materials
LP Components
•
•
•
•
304
316Ti
A286
253MA
Phase 1 – Disqualifying Factors
LP Components
Weldability
(Ti+Al )< 2.5
Larson-Miller
Parameter > ??
Machinability
• Yes – 304, 316Ti, 253MA, A286
• No • Yes • No -