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Call for Charpy toughness samples

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by Larrin, Jan 26, 2018.

Page 3 of 53
  1. Jan 30, 2018 #41
    Larrin

    Larrin Gold Member Gold Member

    3,695
    Jan 17, 2004
    I will test it we just need people willing to heat treat and machine specimens. We have a few individuals willing to help so far but we certainly haven't reached a saturation point yet.
     
    hugofeynman likes this.
  2. Jan 30, 2018 #42
    rodriguez7

    rodriguez7 Gila wilderness knife works Knifemaker / Craftsman / Service Provider

    1,416
    Feb 1, 2009
    Can someone tag Nathan Carothers here. I’m sure he would be willing to contribute.
     
  3. Jan 30, 2018 #43
    Stromberg Knives

    Stromberg Knives strombergknives.com Knifemaker / Craftsman / Service Provider

    829
    Jan 3, 2015
    How tight are the tolerances for the specimen?
     
  4. Jan 30, 2018 #44
    DevinT

    DevinT KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    1,546
    Jan 29, 2010
    All the ones I’ve done have been +/-.001 on the thickness and width, length have run a little long, maybe .05 or so.

    Hoss
     
  5. Jan 30, 2018 #45
    Jrmysell

    Jrmysell

    394
    May 18, 2014
    I don't have any, but ELMAX would be cool to see compared as well.
     
  6. Jan 30, 2018 #46
    Larrin

    Larrin Gold Member Gold Member

    3,695
    Jan 17, 2004
    I will email him.
     
    rodriguez7 likes this.
  7. Jan 30, 2018 #47
    Larrin

    Larrin Gold Member Gold Member

    3,695
    Jan 17, 2004
    The ASTM standard says plus or minus 0.075 mm (~0.003 in).
     
  8. Jan 31, 2018 #48
    Willie71

    Willie71 Warren J. Krywko. Part Time Knifemaker Knifemaker / Craftsman / Service Provider

    11,379
    Feb 23, 2013
    If you are keeping a list, Larrin, I checked my stock, and in addition to the z-wear and cru-wear already mentioned, I’ll do 8670 in two hardnesses. I’m seeing if I can get a sample of 20cv to compare to my third generation m390. If I can, I’ll do that as well, and third, I’ll do two extra z-wear samples trying two vs. three tempers, compared to the four I normally do. I don’t think four is absolutely needed, but I’d like to see the differences between two, three, and four tempers.
     
    rodriguez7 and hugofeynman like this.
  9. Jan 31, 2018 #49
    Larrin

    Larrin Gold Member Gold Member

    3,695
    Jan 17, 2004
    Sounds great! If it were me choosing I would keep the two temper comparison but replace the three temper with a 24h cryo to compare a 30-60 minute cryo with the sometimes recommended longer cryo.
     
  10. Jan 31, 2018 #50
    Larrin

    Larrin Gold Member Gold Member

    3,695
    Jan 17, 2004
    rodriguez7 likes this.
  11. Jan 31, 2018 #51
    Willie71

    Willie71 Warren J. Krywko. Part Time Knifemaker Knifemaker / Craftsman / Service Provider

    11,379
    Feb 23, 2013

    Sure. I can do that.
     
  12. Jan 31, 2018 #52
    JTknives

    JTknives Blade Heat Treating www.jarodtodd.com Knifemaker / Craftsman / Service Provider

    8,001
    Jun 11, 2006
    Has any one offered up cruforgeV yet. I have a small stick I got from Salem that I could forge down into a few coupons.
     
  13. Jan 31, 2018 #53
    Larrin

    Larrin Gold Member Gold Member

    3,695
    Jan 17, 2004
  14. Jan 31, 2018 #54
    DevinT

    DevinT KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    1,546
    Jan 29, 2010
    15N20 on it’s way to Larrin today.

    Hoss
     
  15. Jan 31, 2018 #55
    JTknives

    JTknives Blade Heat Treating www.jarodtodd.com Knifemaker / Craftsman / Service Provider

    8,001
    Jun 11, 2006
    What did you settle on for heat treat parameters?
     
  16. Jan 31, 2018 #56
    DevinT

    DevinT KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    1,546
    Jan 29, 2010
    1470*, 375* x 2 = 60.5 hrc

    Hoss
     
    Justin Schmidt and Willie71 like this.
  17. Feb 1, 2018 #57
    Larrin

    Larrin Gold Member Gold Member

    3,695
    Jan 17, 2004
    Oh boy!
     
  18. Feb 1, 2018 #58
    rodriguez7

    rodriguez7 Gila wilderness knife works Knifemaker / Craftsman / Service Provider

    1,416
    Feb 1, 2009
    I really like the fact that you guys are sharing all the heat treat data with us! Gives us something to work off of. Hopefully I’ll have most of my heat treat equipment by the summer. Excited to try some of this! Thanks everyone!!!
     
    Ken H> likes this.
  19. Feb 1, 2018 #59
    skillgannon

    skillgannon

    991
    Apr 27, 2009
    Hopefully it all goes in a nice sticky so it's easy to find once I get my oven
     
  20. Feb 1, 2018 #60
    hugofeynman

    hugofeynman Gold Member Gold Member

    601
    Jan 18, 2011
    I think I’ve convinced some friends to make and heat treat pieces in K600 (0,45% carbon, 4% nickel), A8mod and Ultrafort (Maraging steel). Will probably take some time until they finish it.
     
    Larrin likes this.
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