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Call for Charpy toughness samples

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

  1. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    We have now added 1084 steel to the chart, as well as a couple more tempering temperatures for L6:
    Low alloy steel toughness 6-14-19.jpg
     
  2. hugofeynman

    hugofeynman Gold Member Gold Member

    559
    Jan 18, 2011
    So 8670 still is the king of the hill!
     
    Last edited: Jun 14, 2019
    rodriguez7 likes this.
  3. daizee

    daizee KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Dec 30, 2009
    Hooray for 1084!! Thanks, Larrin!

    Sure looks like in the hardness range I care about (59-63, but mostly 60-62), 1084 is a great performer. Like AEB-L, it seems you can get a lot of your edge retention from hardness instead of carbides and have a fine, acute edge.

    BTW, do you plan to update this page, or is there another authoritative spot we can see the tabular version of the data?:
    https://knifesteelnerds.com/toughness-database/

    Thanks again!

    -E
     
    Willie71 likes this.
  4. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    Keith Nix likes this.
  5. jdm61

    jdm61 itinerant metal pounder Knifemaker / Craftsman / Service Provider

    Aug 12, 2005
    Those 1084 results are interesting and good news for folks like me to boot. Funny how it tracks right along with CFV until you get close to 63Rc then CFV kind of pulls away. I typically do the 1500/400 HT for straight 1084 which gets me in that 20 lb ft + sweet spot. Just from the 1084 results and the composition of the mix, where what would you guess (and we won't hold you to it) as to where say a typical 60/40 mix of 1084 and 15N20 might land on the chart assuming best methods during forge welding?
     
  6. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    I don't know.
     
  7. Willie71

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

    Feb 23, 2013
    Larrin, was that 1084 I did, or did someone else send some in? After the initial pieces came out soft, I have some normalized and cycled, and ready for heat treat. Doesn’t look like I need to do new samples now. I’m surprised with how much tougher 1084 is than 1095 or O1.


    I’m surprised by the L6 at Rc57. Was it in the embrittlement range? I thought for sure at low hardness it would be tougher than the 8670 @ Rc60.
     
    lazlo likes this.
  8. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    The 1084 came from AKS, presumably from your heat treating. Obviously different than the first ones tested.
     
  9. Willie71

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

    Feb 23, 2013
    It was the same piece of steel, and austenitized all at once. It was cut into individual pieces after 1st temper. Totally bizarre!
     
    Larrin likes this.
  10. Jason Volkert

    Jason Volkert KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    140
    Nov 25, 2018
    I would like to help out with the testing and research. I don't have anyway to precisely heat treat anything at this moment. I send my stuff out for heat treat. I do have a little bit of cash I could put towards the cause. Is there any steel that is needed that you don't have. I'll buy some and ship it to who ever is gonna heat treat the stuff.
    I think this is awesome stuff that you guys are doing. I am already a patreon of Knife steel nerds. But I would like to help out some more if I can.

    Jason
     
    Salival, shqxk, DevinT and 3 others like this.
  11. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    That's a good question. We have quite a few steels tested so far. And a lot that are missing are either in process or I have some and just have to get it cut out and heat treated. One steel that has been challenging to get in a good size is XHP. Last I looked it was all either .093 or 0.25 in.
     
  12. Willie71

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

    Feb 23, 2013
    When I get a break on the truck project today, I’ll post a list of everything done or in the works.
     
    Jason Volkert, DevinT and hugofeynman like this.
  13. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    I also have sent batches for machining to two different people today.
     
    Willie71 and hugofeynman like this.
  14. hugofeynman

    hugofeynman Gold Member Gold Member

    559
    Jan 18, 2011
    Just curious if someone already grinded NZ3 and Ultrafort. These are two candidates to the toughest steel of the test (at least, Ultrafort).:)
     
  15. Willie71

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

    Feb 23, 2013
    They are at JTKnives still.

    NZ3 is pretty close to 9260 in composition, iirc. Should be very tough.
     
    Last edited: Jun 15, 2019
    hugofeynman likes this.
  16. Willie71

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

    Feb 23, 2013
    The samples in the chart were done at 1475f, with a 10 minute soak. They were normalized at 1650f first, then two cycles at 1450f, then heat treated. Tempering ranged from 300f to 450, or 500f, going by memory. Earlier samples weren’t hardened, so i’m not sure which tempers these ones were. It would be interesting to compare 1500f, and 1525f austenitizing temps. Maybe that’s what i’ll Do with the 1084 I have ready to heat treat.
     
  17. Salival

    Salival

    68
    Apr 9, 2014
    That's awesome!

    6150 and ..... INFI :)
     
  18. Willie71

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

    Feb 23, 2013
    Correct, no 6150 or INFI. 9260 is still missing too. Hitachi white and blue are missing. Chuck is doing spicy white, which is in that category.
     
    Salival likes this.
  19. Willie71

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

    Feb 23, 2013
    I just got in from a long day. I’ll post the list tomorrow. I have the info on the computer, and my wife is using it right now.
     
    hugofeynman likes this.
  20. Jason Volkert

    Jason Volkert KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    140
    Nov 25, 2018
    Ok so where can I order some 9260 or 6150 from? Also what size should I order?

    Jason
     
    hugofeynman and Salival like this.

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