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Advances in Fractology: Materiial Limits and Failure Analysis for Turbine Blades**

This comprehensive review discusses critical topics in fractology, focusing on the failure analysis and prevention methods of turbine blades, particularly those operating at extreme temperatures of 1590°C. It delves into the oxidation resistance provided by platinum aluminide coatings for titanium alloys, and explores the microstructural control in welding and solidification processes. Emphasis is placed on the environmental impacts affecting materials, including embrittlement and the effects of various elements. Novel welding techniques and the synthesis of complex alloys are also examined.

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Advances in Fractology: Materiial Limits and Failure Analysis for Turbine Blades**

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Presentation Transcript

  1. 10-25 Recap Matthew Humbert

  2. Fractology • ASM Handbooks • 11 – Failure Analysis and Prevention • 12 –Fractogrophy • 19 – Fatigue and Fracture

  3. Material Limits

  4. 4th Gen Turbine Blades • Operating at 1590 ºC • Reducing and Oxidizing Environment • PtAl TBC • Convective cooling J Gurrappa, I Gurrappa, I. Platinum Aluminide Coatings for Oxidation Resistance of Titanium Alloys PLATINUM METALS REVIEW

  5. Bulk HT Processing • Skull melting • Plasma processing • Sintering • Melting • Reactive Flame Spraying • Reactive Sintering • Everything reacts with everything • Anything is possible

  6. Environmental Damage • Hydrogen embrittlement • Stainless steel sensitization • Blue embrittlement –Temper embrittlement – 425C • Hot-shorting • Liquid metal embrittlement • Nitrogen, oxygen, and carbon embrittlement in specific materials

  7. Baffle Bolt

  8. Ductile to Brittle Transition 1018 mild steel

  9. Giga-tonnes of Nano-Structure • To make big things we need to weld • Progress with BMG’s • Welding – Melting and solidifying • Control microstructure during solidification • Keep enthalpy high while making entropy small • Complex alloys with many components. Y. Kawamura, Liquid phase and supercooled liquid phase welding of bulk metallic glasses, Materials Science and Engineering: A, Volumes 375–377, 15 July 2004, Pages 112-119

  10. Questions

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