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  1. Mett87

    Acicular ferrite or Bainite

    Forgot to mention hardness is 25HRC.
  2. Mett87

    Acicular ferrite or Bainite

    the micrograph below is of a medium carbon steel, the grain size looks too coarse to be bainite - could this be acicular ferrite produced by a 2 stage cooling?
  3. Mett87

    Grain Boundary Carbide Network In725

    Heres another micrograph etched with modified glyceriga electrolytically to show the precipitates http://s23.postimg.org/5n0ggh293/glycerol.jpg%5b/img%5d%5b/url
  4. Mett87

    Grain Boundary Carbide Network In725

    HCL/H2O2 nothing else would touch it! Tried gleyceriga and mixed axids.
  5. Mett87

    Grain Boundary Carbide Network In725

    http://s30.postimg.org/i6ojrebst/image.jpg
  6. Mett87

    Grain Boundary Carbide Network In725

    Unfortunately I don't have a comparison for after the solution anneal or any data regarding mechanical properties, the section is also too small to perform testing on. Kimkumvijay - that is the paper I referenced.
  7. Mett87

    Grain Boundary Carbide Network In725

    This was the paper I found http://www.tms.org/superalloys/10.7449/2001/01-5107-345.pdf
  8. Mett87

    Grain Boundary Carbide Network In725

    I cant find that exact paper, however, I did find one that has suggested M23C6 and M6C type are typically precipitated at the grain boundarys as originally thought. I can't find any reference to the amount of precipitation typical for specific ageing times/temps.
  9. Mett87

    Grain Boundary Carbide Network In725

    I have a section of In725 that appears to have a nearly continuous carbide network at the grain boundaries. Is this typical for this grade? Heat treatment was:- 1040c for 11hr/air cool 730c for 12hr/furnace cool to 620c hold for 8hr/air cool Hardness 37HRC Thanks in advance.
  10. Mett87

    Achieving Low Temperature for Charpy Impacts

    Isopentane (C5H12) and Liquid Nitrogen slush can be taken down to -256F (-160C) if thats any help?
  11. Mett87

    Inconel 625 etching

    i was saying i had no luck with the mixed acid etchant. this was etched electrolytically
  12. Mett87

    Inconel 625 etching

    It appears only on the outer few mm. Would you agree it coukd be possibly from localised heating and slow cooling?
  13. Mett87

    Experience with Buehler product

    Why don't you just hot mount with a glass/mineral filled epoxy?
  14. Mett87

    Inconel 625 etching

    Another micrograph showing defects due to cold working? http://files.engineering.com/getfile.aspx?folder=555b11e6-dcae-4d4b-a808-ab3291cdec86&file=2.jpg
  15. Mett87

    Inconel 625 etching

    Ed, Unfortunately I do not know the background behind the material, also, i dont have the facility for dic or polarized light. metaljon, I have tried with mixed acids etchant with no luck
  16. Mett87

    Inconel 625 etching

    Thanks for the advice, I have now had some luck etching but I am seeing strange areas in the microstructure. I have attached a micrographhttp://files.engineering.com/getfile.aspx?folder=74dedd7d-f902-4512-ac93-5ed0e5e8d011&file=1.jpg
  17. Mett87

    Inconel 625 etching

    also I have tried many of the advised etching techniques with no results
  18. Mett87

    Inconel 625 etching

    Thanks guys, I done a bit reading up on some of Vander Voorts papers. One strange thing with the samples is MC type carbides are visible in the un etched condition, however, in the areas the material has been deformed they appear to have disperesed very finely/or gone completely! Is this possible!?
  19. Mett87

    Inconel 625 etching

    Hi, Could anybody help with a suitable etchant for revealing grain strucutre for grain size determination in Inconel 625, I'm guessing mixed acids is the way to go? I am aware a bit trial and error would be the best solution but as I am waiting for the components I thought I would ask the...
  20. Mett87

    Steel Microstructure of Medium Carbon Steel

    If it had been quenched from above austenitizing temperature there would be no directionality within the grains, in the photomicrograph attached directionality is quite clear. Also unless it was a very thick section you would expect martensite/ferrite in the core.

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