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DEVELOPMENT OF IRON BASE POWDERS SUITABLE FOR LASER WELDING S. Libardi*,  S. Saccarola** ,  C. Poli***, C. Menapace*, A. Molinari* *  University of Trento  ** Pometon S.p.A. Venice - Italy. *** Pentax srl Marostica (VI), Italy
Stone cutting: the evolution
Stone cutting: the evolution
Stone cutting: the evolution In 1953 first synthesis of an artificial diamond
Diamond tools used for cutting of stones and other hard construction materials
Laser welding Laser welding needs a diamond free mixture   Common backing material composition is  Co ,  Ni ,  Fe  based powder Backing material Complex (metallic matrix with diamonds)
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],With these references, we started to develop a new product for this application, an iron based powder with some addictives
[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],Mechanical alloying
Experimental procedure: Two powders used: Fe-Ni (Ni 10%) Extrafine Co Mixed and ball milled for 20 h then we test three powder mixtures: -   simply  mixed powder   -   milled powder   -   50-50 mixture of them
[object Object],Morphology
Densification Densification curves of the mixed and milled powders   after hot pressing at 900°C   516  ±7 HV0.05 7.96 Milled 213  ±28 HV0.05 8.07 Mixed Microhardness Density (g/cm 3 ) Powder
Microstructures microstructure of the 900°C hot pressed  milled powder microstructure of the 900°C hot pressed  mixed powder
XRD analysis milled powder mixed powder 4 % 1 % 95 % Milled 22 % 15 % 63 % Mixed Ni(Co) fcc Fe(Ni) fcc Fe(Ni) bcc Material
Mixing 50 – 50 of them..  Density of the different materials versus the hot pressing temperature
Hot pressing at 800°C mixed milled “ mixed+milled” microhardness
Mechanical properties (1) three points bending curves of specimens obtained with the  mixed  powder tensile curves of specimens obtained with the  mixed  powder
Mechanical properties (2) three points bending curves of specimens obtained with the  milled powder tensile curves of specimens obtained with the  milled powder
Mechanical properties (3) three points bending curves of specimens obtained with the  mixture of the two powders tensile curves of specimens obtained with the  mixture of the two powders
Conclusions ,[object Object],[object Object],[object Object],[object Object]
Conclusions ,[object Object],[object Object],[object Object],[object Object]
Acknowledgements   Università di Trento
Thank you for your attention

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Stefano Saccarola

  • 1. DEVELOPMENT OF IRON BASE POWDERS SUITABLE FOR LASER WELDING S. Libardi*, S. Saccarola** , C. Poli***, C. Menapace*, A. Molinari* * University of Trento ** Pometon S.p.A. Venice - Italy. *** Pentax srl Marostica (VI), Italy
  • 2. Stone cutting: the evolution
  • 3. Stone cutting: the evolution
  • 4. Stone cutting: the evolution In 1953 first synthesis of an artificial diamond
  • 5. Diamond tools used for cutting of stones and other hard construction materials
  • 6. Laser welding Laser welding needs a diamond free mixture Common backing material composition is Co , Ni , Fe based powder Backing material Complex (metallic matrix with diamonds)
  • 7.
  • 8.
  • 9.
  • 10. Experimental procedure: Two powders used: Fe-Ni (Ni 10%) Extrafine Co Mixed and ball milled for 20 h then we test three powder mixtures: - simply mixed powder - milled powder - 50-50 mixture of them
  • 11.
  • 12. Densification Densification curves of the mixed and milled powders after hot pressing at 900°C 516 ±7 HV0.05 7.96 Milled 213 ±28 HV0.05 8.07 Mixed Microhardness Density (g/cm 3 ) Powder
  • 13. Microstructures microstructure of the 900°C hot pressed milled powder microstructure of the 900°C hot pressed mixed powder
  • 14. XRD analysis milled powder mixed powder 4 % 1 % 95 % Milled 22 % 15 % 63 % Mixed Ni(Co) fcc Fe(Ni) fcc Fe(Ni) bcc Material
  • 15. Mixing 50 – 50 of them.. Density of the different materials versus the hot pressing temperature
  • 16. Hot pressing at 800°C mixed milled “ mixed+milled” microhardness
  • 17. Mechanical properties (1) three points bending curves of specimens obtained with the mixed powder tensile curves of specimens obtained with the mixed powder
  • 18. Mechanical properties (2) three points bending curves of specimens obtained with the milled powder tensile curves of specimens obtained with the milled powder
  • 19. Mechanical properties (3) three points bending curves of specimens obtained with the mixture of the two powders tensile curves of specimens obtained with the mixture of the two powders
  • 20.
  • 21.
  • 22. Acknowledgements Università di Trento
  • 23. Thank you for your attention