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Journal Articles

Metallurgical Investigation and Failure Analysis in GTD-111 Stage 2 Buckets From an Industrial F-Class Gas Turbine

Alex Bridges, John Shingledecker, Yongqing Wang
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. August 2025, 147(8): 081011.
Paper No: GTP-24-1713
https://doi.org/10.1115/1.4067216
Published Online: January 20, 2025
View Article titled, Metallurgical Investigation and Failure Analysis in GTD-111 Stage 2 Buckets From an Industrial F-Class Gas Turbine
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Topics: Airfoils, Blades, Casting, Creep, Damage, Design, Fracture (Materials), Fracture (Process), Gas turbines, Grain boundaries
Journal Articles

Review of the Impact of Hydrogen-Containing Fuels on Gas Turbine Hot-Section Materials

Jacqueline O'Connor, David R. Noble, Alex Bridges, John Shingledecker, John Scheibel, Michael Gagliano
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. August 2025, 147(8): 081013.
Paper No: GTP-24-1734
https://doi.org/10.1115/1.4067335
Published Online: January 20, 2025
View Article titled, Review of the Impact of Hydrogen-Containing Fuels on Gas Turbine Hot-Section Materials
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Topics: Fuels, Gas turbines, Hydrogen, Temperature, High temperature, Alloys, Flames, Combustion, Heat transfer, Water
Proceedings Papers

Evaluation of Service Removed HP40-Modified Reformer Tubes and Development of Multi-Axial Pressurization Testing in Full-Size Components

Alex Bridges, Eeva Griscom, Michael Gagliano, John Siefert, Jorge Penso, Jordan Barrass
Proc. ASME. PVP2024, Volume 4: Materials & Fabrication, V004T06A092, July 28–August 2, 2024
Publisher: American Society of Mechanical Engineers
Paper No: PVP2024-123527
https://doi.org/10.1115/PVP2024-123527
View Paper titled, Evaluation of Service Removed HP40-Modified Reformer Tubes and Development of Multi-Axial Pressurization Testing in Full-Size Components
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Topics: Creep, Testing, High temperature, Temperature, Casting, Damage, Ductility, Furnaces, Heat, Heat resistant materials
Proceedings Papers

Metallurgical Investigation and Failure Analysis in GTD-111 Stage 2 Buckets From an Industrial F-Class Gas Turbine

Alex Bridges, John Shingledecker, Yongqing Wang
Proc. ASME. GT2024, Volume 9: Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications; Steam Turbine, V009T17A015, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-126858
https://doi.org/10.1115/GT2024-126858
View Paper titled, Metallurgical Investigation and Failure Analysis in GTD-111 Stage 2 Buckets From an Industrial F-Class Gas Turbine
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Topics: Creep, Failure analysis, Gas turbines, Metallography
Proceedings Papers

Challenges in the Life Management of Steam Methane Reformer (SMR) Components

Alex Bridges, Michael Gagliano, John Siefert, Mitul Dalal, Jorge Penso
Proc. ASME. PVP2023, Volume 5: Materials & Fabrication, V005T06A058, July 16–21, 2023
Publisher: American Society of Mechanical Engineers
Paper No: PVP2023-106623
https://doi.org/10.1115/PVP2023-106623
View Paper titled, Challenges in the Life Management of Steam Methane Reformer (SMR) Components
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Topics: Creep, Methane, Steam
Journal Articles

Options for Improving Performance of Additively Manufactured Nickel-Base Superalloys for Gas Turbine Applications

Alex Bridges, John Shingledecker, John Clark, David Crudden, Michael Kirka, Patxi Fernandex-Zelaia
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. March 2024, 146(3): 031017.
Paper No: GTP-23-1419
https://doi.org/10.1115/1.4063631
Published Online: November 28, 2023
View Article titled, Options for Improving Performance of Additively Manufactured Nickel-Base Superalloys for Gas Turbine Applications
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Topics: Additive manufacturing, Creep, Gas turbines, Heat treating (Metalworking), Nickel, Rupture, Stress, Superalloys, Temperature, Testing
Proceedings Papers

Options for Improving Performance of Additively Manufactured Nickel-Base Superalloys for Gas Turbine Applications

Alex Bridges, John Shingledecker, John Clark, David Crudden, Michael Kirka, Patxi Fernandez-Zelaia
Proc. ASME. GT2023, Volume 8: Industrial and Cogeneration; Manufacturing Materials and Metallurgy, V008T17A012, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102648
https://doi.org/10.1115/GT2023-102648
View Paper titled, Options for Improving Performance of Additively Manufactured Nickel-Base Superalloys for Gas Turbine Applications
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Topics: Additive manufacturing, Cathode ray oscilloscopes, Electron beams, Gas turbines, Lasers, Nickel, Superalloys
Proceedings Papers

Observations in the High-Temperature Creep Performance of Diffusion Bonds for sCO2 Heat Exchangers

John Shingledecker, Vikash Kumar, Alex Bridges
Proc. ASME. GT2023, Volume 12: Supercritical CO2, V012T28A018, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102967
https://doi.org/10.1115/GT2023-102967
View Paper titled, Observations in the High-Temperature Creep Performance of Diffusion Bonds for sCO2 Heat Exchangers
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Topics: Diffusion (Physics), Diffusion bonding (Metals), Heat exchangers, High temperature creep
Proceedings Papers

Full Rejuvenation Heat Treatment of MGA 1400DS

Hans van Esch, Stijn Pietersen, Wayne Greaves, Alex Bridges, John Scheibel
Proc. ASME. GT2023, Volume 8: Industrial and Cogeneration; Manufacturing Materials and Metallurgy, V008T17A007, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101741
https://doi.org/10.1115/GT2023-101741
View Paper titled, Full Rejuvenation Heat Treatment of MGA 1400DS
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Topics: Creep, Fatigue testing, Heat treating (Metalworking), Melting, Rupture, Stress, Superalloys
Journal Articles

Creep Analysis and Microstructural Evaluation of a Novel Additively Manufactured Nickel-Base Superalloy (ABD ® -900AM)

Alex Bridges, John Shingledecker, John Clark, David Crudden
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. June 2023, 145(6): 061005.
Paper No: GTP-22-1421
https://doi.org/10.1115/1.4056097
Published Online: January 13, 2023
View Article titled, Creep Analysis and Microstructural Evaluation of a Novel Additively Manufactured Nickel-Base Superalloy (ABD ® -900AM)
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Topics: Creep, Rupture, Stress, Superalloys, Temperature, Nickel, Heat, Additive manufacturing
Proceedings Papers

Metallurgical Characterization of a 114,000-Hour Service-Aged Forge 91-Pipe 91 Steel Header Weldment

Yiyu Wang, Wei Zhang, Yanli Wang, Zhili Feng, John Siefert, Alex Bridges, Steven Kung
Proc. ASME. PVP2022, Volume 4B: Materials and Fabrication, V04BT06A021, July 17–22, 2022
Publisher: American Society of Mechanical Engineers
Paper No: PVP2022-85319
https://doi.org/10.1115/PVP2022-85319
View Paper titled, Metallurgical Characterization of a 114,000-Hour Service-Aged Forge 91-Pipe 91 Steel Header Weldment
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Topics: Pipes, Steel, Creep, Cavities, Damage, Base metals, Coal, Cracking (Materials), Density, Fracture (Process)
Proceedings Papers

Characterization Methods to Evaluate Recrystallization and Weld-Repair in Single Crystal Nickel-Base Superalloys

Alex Bridges, John Shingledecker, Eeva Griscom, Hans van Esch, Stijn Pietersen, Robert Zuber, Wayne Greaves
Proc. ASME. GT2022, Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications, V007T17A016, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-82537
https://doi.org/10.1115/GT2022-82537
View Paper titled, Characterization Methods to Evaluate Recrystallization and Weld-Repair in Single Crystal Nickel-Base Superalloys
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Topics: Crystals, Gas turbines, Maintenance, Nickel, Recrystallization, Superalloys
Proceedings Papers

Creep Analysis and Microstructural Evaluation of a Novel Additively Manufactured Nickel-Base Superalloy (ABD®-900AM)

Alex Bridges, John Shingledecker, John Clark, David Crudden
Proc. ASME. GT2022, Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications, V007T17A015, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-82512
https://doi.org/10.1115/GT2022-82512
View Paper titled, Creep Analysis and Microstructural Evaluation of a Novel Additively Manufactured Nickel-Base Superalloy (ABD®-900AM)
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Topics: Additive manufacturing, Creep, Gas turbines, Nickel, Superalloys
Proceedings Papers

Recrystallization of René N4 and N5

Hans van Esch, Stijn Pietersen, Alex Bridges, John Scheibel, Robert Zuber, Wayne Greaves
Proc. ASME. GT2022, Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications, V007T17A007, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-81438
https://doi.org/10.1115/GT2022-81438
View Paper titled, Recrystallization of René N4 and N5
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Topics: Recrystallization, Crystals, Maintenance, Superalloys, Heat, Manufacturing, Nickel, Compressive stress, Shot peening, Stress
Proceedings Papers

Full Rejuvenation Heat Treatment of GTD 111DS

Hans van Esch, Stijn Pietersen, Wayne Greaves, Alex Bridges, John Scheibel
Proc. ASME. GT2022, Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications, V007T17A008, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-81454
https://doi.org/10.1115/GT2022-81454
View Paper titled, Full Rejuvenation Heat Treatment of GTD 111DS
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Topics: Heat treating (Metalworking), Mechanical properties, Stress, Fatigue, Gas turbines, Hot pressing, Low cycle fatigue, Mechanical testing, Rupture
Proceedings Papers

Metallurgical Evaluation of an Additively Manufactured Nickel-Base Superalloy for Gas Turbine Guide Vanes

Alex Bridges, John Shingledecker, Alex Torkaman, Lonnie Houck
Proc. ASME. GT2020, Volume 8: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine; Microturbines, Turbochargers, and Small Turbomachines, V008T18A005, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14808
https://doi.org/10.1115/GT2020-14808
View Paper titled, Metallurgical Evaluation of an Additively Manufactured Nickel-Base Superalloy for Gas Turbine Guide Vanes
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Topics: Additive manufacturing, Gas turbines, Guide vanes, Nickel, Superalloys, Creep, Grain size, Rupture, Alloys, Casting