Heat Treatment - Crystal Weaving Foundation

Twindog said:
This is awesome research, Luong. Thank you for sharing.

The bone was obviously a bridge too far for steels this hard and edges this thin.

To my eye, it looks as though M4 and T-15 fared the best on rope and bamboo. I thought MagnaCut would do better, based on your previous work, although it looks to be fairly good relative to most of the other steels in the bone test.
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You are right on both points: slice pork rib bone is too far/difficult for 10dps ~2-3thousands of an inch edge. M4 & T-15 (steels with 4+W%) show best edge stability (also minimal wear) against rope & bamboo. 65.5rc Magnacut fine carbide microstructure still has good plasticity at this peak hardness. Magnacut fine grain doesn't excel over other steels because bcmw ht generated subgrain (grain within grain) putting all ht-ed steels on same playing field. Reflected so by compare e.g. between 66rc s90v and 65.5rc magnacut.

However if order ranking result on test/data objective without regard to hardness differences - plasticity range/distance then 26c3,niolox, cpm154, magnacut. Per my narrative in video - shouldn't compare between steels for slicing bone because of inconsistencies in cutting pressure; angle; etc.. Slice bone data did shown 26c3 & niolox & cpm154 & magnacut range of plasticity allowed prior to fractured.

tinfoil hat timmy said:
to be fair.

2 to 3 thousands of an inch behind the edge is essentially nothing. I'd like to see these results on the pork bone with say... .01" BTE
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I estimate at 0.01" BET edge, damage would be around 2x of bamboo at 0.0025-0.0035" BET. 12dps 0.01"BET = 1x bamboo. 15dps = 1x rope. Yep, dried bone is a nasty crunchy hard material.
 
HT6 params are set to produce max/peak hardness, making it easier to measure toughness at boundary/limit condition. Which mean, S125V chopper probably will has hardness between 65-66.5rc. I sure would like to includes cpm154 and magnacut choppers in this batch but that would add too much thermal mass.

btw - HT will take 5-7 days, all blades will go through from quench to finish processes together. If divide 25 blades into 5 group of 5, it would takes 25-35 days to ht :(

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HT6 TF0_3DTG7 is in progress (since yesterday). There were a few blades added to this batch. Below are austenite temperatures & steels

1435F: 1095, O7, 26C3, 52100

1875F: D2, CPM D2, D3, D6, Psf27

1975F: Aebl, Niolox, CPM154, S35vn, Vanadis4e, Zwear

2100F: 10V, 15V, T15, M2, M4, K390, Zmax, S90V, 204P, M398, Elmax, Magnacut, S125V

Sort of a surprise, counted different 28 steels. 20L LN2 dewar gets a re-fill today. Pandemic LN2 price(gouging) is perpetual now - $12 per liter. Hopefully I don't need to fill up the 30L dewar as well.

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There are 4 test blades from ht5 tf7...: 64rc n690, 63.5rc Becut, 63rc 3V, 65.5rc S690. If anyone interest in seeing how they perform in 10dps test, lmk.
 
Twindog said:
This is awesome research, Luong. Thank you for sharing.

The bone was obviously a bridge too far for steels this hard and edges this thin.

To my eye, it looks as though M4 and T-15 fared the best on rope and bamboo. I thought MagnaCut would do better, based on your previous work, although it looks to be fairly good relative to most of the other steels in the bone test.
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It doesn’t surprise me the 2 high speed tool steels had the best edge stability amongst those tested.

I appreciate Luong’s work.
 
After 7 days of HT6 processes, 2/3 is done. Hardness readings:

10V 65.5, 15V 66, 204P 59, Aebl 56, CPM154 63, D2 65, CPM D2 65, D3 64, D6 64, Elmax 62
K390 67, M2 64, M398 64, M4 64.5, Magnacut 63, Niolox 60, Psf27 65
S35vn 64, S90V 65, S125v 66.5, T15 67, Vanadis4E 62.5, Zmax 67.5, Zwear 63

Edit 20210717: S125V 66.5rc 18dps chop test video cross link - https://www.bladeforums.com/threads/s125v-66rc-chopper.1795220/post-20624118
 
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10.5 days of MS6 (formerly HT6) is about done. Final HRC +- 0.5rc compilation:

10V 67.5, 15V 67, 204P 61.5, Aebl 61, CPM154 64, D2 64.5, CPM D2 65, D3 68, D6 66.5, Elmax 63
K390 67, M2 65, M398 65.5, M4 65.5, Magnacut 64, Niolox 62, Psf27 65
S35vn 64.5, S90V 65, S125v 67, T15 66.5, Vanadis4e 66, Zmax 67.5, Zwear 65

Edit: 1095 66, 26c3 65, 52100 63-64, O7 62-65 diff.
 
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CPM 15V 67rc 10 dps, 0.0039" BET. **note** light shine at apex.

Cut pork rib bone exhibits excellent toughness (deformations w/o fractured)

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Research metal sequencing: TF0_SBF1_3DTG7

1095 66rc Corrosion and wear resistance test.
Sharpened with Edgepro 10dps, 85um/0.0033" BET

Corrosion test: 4 sprays of ocean water in 24 hrs period
Wear test: 300 cuts 1" dia sisal rope

6:00 video

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V1 is on page 12 https://www.bladeforums.com/threads...ving-foundation.1409721/page-12#post-16355537
since the thread got quite long I wrote an attempt at a synopsis on page 45 https://www.bladeforums.com/threads...ving-foundation.1409721/page-45#post-19902630
bluntcut later added 3 details:
- low hardenability steels should be quenched in fast quenchant (50°C oil or specialized quenchant like parks50) for 3-4 seconds before they go into the hot oil
- the oil can be 200°C/390°F hot, basically any temp from 180 to 240°C/360-465°F should work. 150°C is too low.
- cryo & temper soak step should be repeated at least once.

(thread has now reached 1000 posts)
 
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