Heat Treatment - Crystal Weaving Foundation

So after all of your efforts, what steel/heat treatment in your experience is the most durable in this kind of test?
HT 5 Theta Function is still being test/determine, my latest projection = ~66rc 1095/W2/52100. Thus far with current HT ~65rc high alloy steels performed very well, hence might be just behind low alloy steels.
 
Looking to capture data on threshold range where chopping 16D nail cross over from succeed (deformation) to failure (chipped).

CPM 15V, 68.5rc - HT 5 TF 7,15,22.5|5,15,20|2,15,14|0,25

Sharpened with edgepro: 18DPS, ~0.0122" BET

5:30 video

YzMBZoN.jpg
 
So after all of your efforts, what steel/heat treatment in your experience is the most durable in this kind of test?
Right!!!! I have been pseudo-following this thread, but it has almost reached the point of data overload. No offense intended at all, this is all good stuff. But there is just SOOOOO much of it now.

Could I humbly suggest a summary of what steels perform best at what RC?
 
Right!!!! I have been pseudo-following this thread, but it has almost reached the point of data overload. No offense intended at all, this is all good stuff. But there is just SOOOOO much of it now.

Could I humbly suggest a summary of what steels perform best at what RC?
Posts come in spurt driven by R&D results. Sorry, for recent rapid pace. My approach is to share data, readers do the thinking. However I will consider constricting data sharing.
 
Well Timmy - your curious open mind demonstrates bountiful brain sulci :thumbsup:
well.... share all the data still please. we like all the data.

Thanks for clarified your point :thumbsup: I am setting up more ht equipment, so research intensive will go on for a few more months. When seeing a series of post on charpy impact test #s, good probable of about entering development phase. Then I will summarize/compile result & discuss ht metallurgy.

HT advancement is cumulative, shared data in progress are point-in-time wysiwyg. Best to comments/questions data of interest, my in-context answers might provide insight (or sow deeper confusion/ambiguity :p)

Don't stop sharing - that was not my intention or request at all!

I will say it another way.....at what point will you stop testing, and begin to compile the results and formulate conclusions?
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I'm thinking to test S90V 65rc chopper at 18dps (already tested & shared video at 20dps).

If price of .275" thick S125V(~30% carbide volume) is reasonable, will make a 64-66rc proof of ht concept chopper.
 
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CPM 10V 68rc - HT5 TF7,15,22.5|5,15,20|2,15,14|0,25
Sharpened with Edgepro: 15dps, 0.019" BET

Gathering edge performance and failure mode when chopping Lignum Vitae and 16D nail.

9 minutes video

Edge after chopped Lignum Vitae
WPdvOFe.jpg


odjR9Kq.jpg


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**********
In 3 weeks, I will make a S125V .275" thick x 2.25" wide chopper. Aim for late July testing date.
 
** NOTICE: this blade was heat treated with BluntCut MetalWorks' proprietary ht protocol, NOT mfg/public ht protocol **

Test chopping super hardwood and 16D nail
CPM MagnaCut 65rc, HT 5 TF7,15,22.5|5,15,20|2,15,14|0,25
Sharpened with edgepro: 15dps, 0.013" BET

9 minutes video

Z7MqGu7.jpg
 
Test: Cut rope, argentine lignum vitae and pork rib bone
Objective: gather thin steel failure mode and plasticity range

20CV 64.5rc - HT 5 TF7,15,22.5|5,15,20|2,15,14|0,25
Sharpened with edgepro: 7.5dps (straight razor edge bevel), deburred with DMT EE, 0.015" BET


XNnuQMV.jpg
 
*note: Elmax has ~18% vs Magnacut ~8% carbide volume

Chop test: Argentine Lignum Vitae and 16D nails

Elmax 65rc - HT 5 TF7,15,22.5|5,15,20|2,15,14|0,25
Sharpened with edgepro: 15dps, 0.013" BET

12 minutes video

Closeup edge after wood & nail:
rxZW2S0.jpg


Closeup of big chip:
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CPM MagnaCut 65.5rc - HT 5 TF7,15,22.5|5,15,20|2,15,14|0,25

Sharpened with edgepro: 10 dps, 1200 grit diamond waterstone

Test edge stability and damage mode when cutting sisal rope, whittle Argentine Lignum Vitae, Pork rib bone.

12 minutes video

YaSk4f7.jpg
 
Well that is a nice result considering that the edge is as thin as or thinner than a razor blade.
Thanks. I supposed edge could be a little bit thinner, since the largest damage (from sliced pork rib bone) is 0.0023" thick, so maybe I will try 0.0030-0.0035" BTE on coming tests.
incredible stuff. you've really got something here I can feel it.
Thanks Timmy! Yours analysis & instinct are outstanding!

I will additionally test [m4, cpm154,..] to confirm/validate definitive toughness at 64+rc hardness with 10dps and ~0.004" BTE edge geometry. Thus far I gathered a fairly large HT5 samples as baseline for comparing to upcoming HT. Perhaps 'something' is here and hopefully HT6 TF3DTG7 brings more things 😎
 
With this set data below, I've sufficient info to decide ht6 parameters.

Gathering data on plasticity of 9 steels with 64-66rc hardness at 10 dps edge geometry by cutting rope; bamboo and pork rib bone.

64rc 20cv, 64rc 26c3, 65rc cpm154, 65rc m4, 65.5rc magnacut, 64.5rc niolox, 64rc s45vn, 66rc s90v, 65rc cpm t-15.

14:40 video

R3rG588.jpg
 
With this set data below, I've sufficient info to decide ht6 parameters.

Gathering data on plasticity of 9 steels with 64-66rc hardness at 10 dps edge geometry by cutting rope; bamboo and pork rib bone.

64rc 20cv, 64rc 26c3, 65rc cpm154, 65rc m4, 65.5rc magnacut, 64.5rc niolox, 64rc s45vn, 66rc s90v, 65rc cpm t-15.

14:40 video

R3rG588.jpg

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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