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Microstructure & Performance of Joints in High Temperature Alloys

Microstructure & Performance of Joints in High Temperature Alloys. Microstructure & Performance of Joints in Superalloys. www.msm.cam.ac.uk/phase-trans. Diffusion Bonding. Pure aluminium. Minimal gallium. Shirzadi, Saindrenan & Wallach, 2003.

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Microstructure & Performance of Joints in High Temperature Alloys

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  1. Microstructure & Performance of Joints in High Temperature Alloys

  2. Microstructure & Performance of Joints in Superalloys www.msm.cam.ac.uk/phase-trans

  3. Diffusion Bonding Pure aluminium Minimal gallium Shirzadi, Saindrenan & Wallach, 2003

  4. Diffusion Bonding of Gallium -Treated Superalloy Surfaces 3-10 MPa pressure 900-1250 oC 1 h 10-7 bar 1 mg cm-2 gallium

  5. 100 µm Co-23Cr-10 Ni-7W 0.2Ti-0.6C-0.5Zr wt% Shirzadi & Wallach

  6. 50 µm Ni-15Cr-10Co-9.5Mo 4.2Al-3.6Ti-0.006B wt% Shirzadi & Wallach

  7. Directionally solidified nickel superalloy Single-crystal nickel superalloy Shirzadi & Wallach

  8. Bonding completed in 1 hour Shirzadi & Wallach

  9. Single-Crystal Repair Melt shallow layer of SX substrate using laser. Feed melt pool with alloy powder. Epitaxial columnar growth. Repeat to build thicker layers. Kurz

  10. Single-Crystal Repair Kurz

  11. Kurz

  12. Single-Crystal Surface Engineering Lowering Cr improves properties. Polycrystalline coatings such as NiCrAlY. Ni is anisotropic.

  13. Sieborger et al. E100 = 125 GPa E111 = 310 GPa

  14. Dendrites grow along <100>. Variant selected is closest to heat flux. Kurz

  15. high aluminium MCrAlY primary b low aluminium MCrAlY primary g

  16. MCrAlY CMSX-4

  17. Transient liquid-phase bonding

  18. Al-Li TLP TG-TLP Shirzadi & Wallach, 1999

  19. TG-TLP Alloy 6082 Large gradient Small gradient Shirzadi & Wallach, 1999

  20. Inertia Welding Process No liquid phase Can join dissimilar metals Powder metallurgical alloy RR1000 Residual stress Baxter, Preuss, Withers

  21. Rolls-Royce Nottingham

  22. Mechanically Alloyed Oxide Dispersion Strengthened Metals

  23. Fine dispersion of yttria particles

  24. screw shoulder termination

  25. 2D Mixing Animation Colegrove & Shercliff, 2002

  26. Microstructure & Performance of Joints in Superalloys www.msm.cam.ac.uk/phase-trans

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