1 / 31

Microstructure & Performance of Joints in High Temperature Alloys

Explore the diffusion bonding of high-temperature alloys at 900-1250°C under 3-10 MPa pressure, including directionally solidified nickel superalloys and single-crystal repairs. Learn about bonding techniques, such as Transient Liquid-Phase (TLP) and Inertia Welding, for joining dissimilar metals. Discover the impact of alloy compositions on microstructures and mechanical properties.

harveyg
Download Presentation

Microstructure & Performance of Joints in High Temperature Alloys

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related