Heat Treatment - Crystal Weaving Foundation

bluntcut said:
Batch 2 HT 5.0 A & B 32 work pieces are ready for hardening. Probably be 6 Aust heating. Interrupted Super Quench for low alloy. Oil quench for high alloy. None & Pre & post Cryo tests.

Low alloy target 63-66rc
High alloy stainless 63-65rc
High alloy 4-6%cr 2-3rc below peak hrc (cwf ht 1-4 reference)

Cost: Time(days) & Resource intensive (aka most expensive sequencing)

Risk of Failure: Moderate. However most blades can be re-ht to plain HT 5.0 rather than A or B

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I like that s45vn blade profile and the W2 model looks nice as well. Good luck!
 
Chopping Lignum Vitae also hurts me. I think it looks excellent as handle material, and certainly hard stuff...

Block of aluminum??

Bunch of great blades in this batch.
 
Lignum Vitae quite too heavy for knife - maybe good for chopper - handle. Well, I need something to substitute cow femur; super hard wood; soft metal; etc. good consistency and reasonable price. Nail chopping edge will leave a deep cut to the backing material. I just ordered a 2x3x6" aluminum block - will give it a try. Probably need to flatten it with a file after a few nail chops.

Bigfattyt said:
Chopping Lignum Vitae also hurts me. I think it looks excellent as handle material, and certainly hard stuff...

Block of aluminum??

Bunch of great blades in this batch.
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Thanks.
When this batch 2 is in progress, batch 3 will get prepare. tentative batch3 high alloy set: 15v, t15, m398, zmax, m4, s690, 204p. too bad, I don't have rex121 nor s125v to toss in. Anyway, as far as my need of testing m398 probably as brittle as s125v anyway, thus will see how ht 5.0 m398 performs.

ice-pic said:
I like everything I see in the 2150f batch,wishing you success.
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200C to save the oil from degrading (i.e. avoid smoke/smell). If using salt bath/oven, keep at 230C. I tested many blades 150 vs 200 vs 240c, can't discern perf diff between 200 & 240c. 150c performed poorer than other 2 temps. Since HT 1.5+, I uses 200C.

outlandish710 said:
wait, only 200°C not 230-240? is that a typo or as intented? does that apply to all low alloy steels too?
sorry for answering so late, I had missed that detail on first read.
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Batch 2 HT 5.0 A & B - at this stage - took 3.5days. Can't get LN2 locally, due to pandemic. Thus, I did changed HT a little bit to reduce RA% while keeping post quench (equiv to tempering) temperature below 400F. i.e. conventionally called low-temperature-tempering.

10xx, W2, 26C3, etc 62.5 to 63rc -> chopping 16D nail @18dps = edge rippled & rolled. Target batch 3 ht 5.0C to produce ~65rc.

17N2 = failed to harden due to wrong(too hight) aust temp
10V 65rc
S45VN 61rc
T15 65.5rc
15V 67rc
Niolox 62-63rc
K390 66rc
S90V 65rc
440C 60rc

Edge Stability Test Video
M398 64.5rc
EdgePro 15dps, 400-1200grit diamond plates, deburred DMT EE
 
HT 5.0A, 1095 63rc
Sharpened: edgepro 20dps 400 grit diamond plate, burred 600 grit diamond

Edge after cut 3/8" diameter rebar
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8 minutes video

HT 5.0A+ 26C3 63rc 20dps, 0.020" BET
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Batch #3 HT 5.0 C & D work pieces are ready for foil wrap then HT. Target hardness 64-66rc.

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Estimate HT process takes 3-4 days.

Will test 26C3, 1095, W2 and O1 blades 20dps ~0.022" BET to cut - to red line, and edge afterward still slice printer paper
xUxURyC.jpg
 
Hardness summary for HT 5.x (pre-cryo/post-cryo HRC)

HT 5A: 10V 65/69, S45VN 61/62, T15 65.5/67, Niolox 61/62, 15V 67/67, K390 66/67, S90V 65/, 440C 60/62, M398 64/

HT 5 C & D:
Low alloy carbon ~64rc/
NitroV /62, N690 58/64, ZMax 67/68.5, Aebl 60/64, S35vn /62, 3V 62/63, CPM 154 62/66, Niolox /62
17N2 58/61.5, D2 /66/64@400F, D6 /66
T15 66/67.5, 10V /69, 15V /67.5, 204P 58/64, M4 65/65, S90V /65, K390 66/67

*per cutting steel rod test/challenge - 10mm dia is possible. 10mm dia hexagon 12L14 cold finished will arrive in a few days. Here is a visual size comparison
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HT 5E is in progress. Steels [1095, 26C3, O1, W2, 52100, O7, Cfv, 1.2419]
 
bluntcut said:
Batch #3 HT 5.0 C & D work pieces are ready for foil wrap then HT. Target hardness 64-66rc.

x2sEPiH.jpg


Estimate HT process takes 3-4 days.

Will test 26C3, 1095, W2 and O1 blades 20dps ~0.022" BET to cut - to red line, and edge afterward still slice printer paper
xUxURyC.jpg
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You done went and made a nakiri... that makes me excited! I'm curious the result you get with that one... if you end up selling it let me know!
 
Nakiri in HT 5D failed. That 1095(0.130" spine) and a new 26c3(0.136" spine) nakiri in HT 5E were successful = on target in grain size and hardness (64.5rc). These 2 nakiri actually were planed for test cut steel rod instead of vegies - :D wide blade = can keep grind a new edge and keep testing. Once HT 5.x is finalized, I will make 0.10" or thinner nakiri in low and mid alloy steels. Thanks for asking :thumbsup:

Maggot Brain said:
You done went and made a nakiri... that makes me excited! I'm curious the result you get with that one... if you end up selling it let me know!
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HT 5D result:
17N2 (similar to N680 with extra carbon and nitrogen) blades in HT 5D turned out very well. I will do HT 5F for 2 more 17N2 blades - aim to push hardness greater than 62rc. Grind and sharpening were easy. Super stable and good edge retention. Did a little corrosion resistance test = performed as expected. If I find 1 or 2 blades of LC200N/z-finit blade (59-60rc), will side-to-side corrosion test. Here is 17N2 after ~3hrs of multiple cycle of salt water rub & dry.

 
HT 5F batch 4 is being assemble, quite a few niolox blades. Groups: Low/no alloy carbon, 1900F for 17N2, 1975F [niolox, aebl, nitro-v, 3v, zwear, vanadis4e,s30v,s45vn,elmax,..].

Cutting steel rod quest: gathering blade candidates stage. Received 3 bars 10mm diameter 14L14 steel, will try this size first. Quite a challenge ...

HT 5E Niolox 63rc, 13dps, 0.006-0.007" behind edge thick. Edge after test: https://i.imgur.com/OT6juiG.jpg

HT 5E 26C3 65rc, 15dps, 0.010-0.011" behind edge thickness
Edge after antler: https://i.imgur.com/0eKjZ8b.jpg Edge after nail: https://i.imgur.com/ylfou0l.jpg

HT 5D CPM 3V 63rc, 15dps, 0.010-0.011" BET
Edge after antler: https://i.imgur.com/P7LGnhc.jpg
 
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Someone asked me about edge stability in term of toughness. Here is my reply (re-post from youtube)

Edge stability/capability = functioning within range limit of 3 yield points [strength, deflection, impact load]. Conventional HT constrained itself to mutual exclusive among 3 yields. i.e. increase/widen strength at cost of decrease/narrow deflection & load, etc.

For example: a conventional ht D2 64rc would has low edge stability because of low deflection and impact load. Thus almost certain would chip if facing same tests as in video. Toughness = 3 yields + plasticity + ductility. Edge stability in toughness sense = whatever edge afterward still functional according to explicit specs.

BCMW HT 5 R&D main objectives are to uncoupling (inclusive rather than exclusive) 3 yields + plasticity range + ductility. D2 in this video demonstrated some of that.​
 
Thanks for sharing your truly informative testing, Luong. Your work is awesome, and I appreciate your candor and honesty in revealing the results. I've never seen you hype anything.

I was wondering why you use such thin edges for chopping nails and bones? The 3V at 63 Rc you tested had an edge width of just 0.010 inches and an edge angle of 15 dps. I don't see how any edge that thin and acute can survive that kind of abuse, regardless of steel or heat treat. My understanding is that 3V heat treated conventionally does not have good edge stability with thin edges.

And in terms of edge stability, your 3V at 63 Rc seemed to roll and dent when abused, rather than chip. I don't know how hard you can take 3V, but wouldn't those results lead you to increase the hardness so that strength and toughness were more evenly balanced? Your tests showed toughness exceeding strength by a fair amount.

It seems that for any given steel/heat treat in a blade performing any given task, the best edge stability will be found at the perfect balance between strength and toughness (chipping and rolling).
 
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