Love learning so much about steels
Love learning so much about steels
[QUOTE=WMR;847253]If you enjoy information about steel and have an iPhone, I found this in the Off-Topic Forum and really like it:
Just installed it!
Blake, I have a Phil Wilson S110V knife at rc 63.5-64 and it doesn't really sharpen and harder than S90V IMO. Of course I'm using diamonds and the edges are thinner than the typical production blade. I suppose changing the bevel or grinding off a lot of steel would make a difference though.
I wouldn't have a problem recommending a S110V knife that's 3 inches run at rc 62. It seems plenty tough to me in a harder blade with thinner edges. Of course I use it as what it is though, a slicer and cutter. Scraping, pounding, or twisting out of deep cuts would likely cause a bit of damage. Cutting huge quantities of rope didn't cause problems though.
It's not a fragile steel like a person would think though. I guess it's in the S90V range which is doable in knives with cutting as their main purpose.
"A Mastiff is to a dog what a Lion is to a housecat. He stands alone and all others sink before him. His courage does not exceed temper and generosity, and in attachment he equals the kindest of his race" Cynographia Britannic 1800
"Unless you're the lead dog the view is pretty much gonna stay the same!"
i have to agree with ankerson. 62-63 would be ideal in a production folder. hopefully Sal will chime in.
Maybe this is off topic, but other companies have pushed the Cryo treatment. I would love to try out a Cryo'd blade from Spyderco. Doesn't have to be something like S110V, it could be something like S35VN or S30V or XHP or BD1 or something. I'm just figuring it would be one of the golden models/steels.
A while ago on BF, a guy made the comment that he was messing around with liquid nitrogen, dipped his knife in, and after that, the knife performed much better. (This could be a load of BS, but it has me interested.)
In short, before you would ask for a deep quench you need to find out how the steel is being austenized and tempered to even know if it is of benefit.
As I have explained to you before, and so have many other people, the reason you see differences in how the edge behaves isn't the hardness, it is the microstructure.
What you are doing is comparing two basketball players :
-one is 6'10"
-one is 6'2"
The first guy wins a round of 21.
You then conclude it was because of his height and you then go to the coach of your team and ask them to get the guys to wear high heels because they will be taller and therefore better players. When anyone asks, this then is the advice you give, just make the guys taller.
Now if you want actual facts :
D2 at 62 HRC has a compression strength in ksi of 319
D2 at 60 HRC has a compression strength in ksi of 312
If you drop the hardness way down to 55 you will find that the compression strength is 261, which is what you would expect with a 20% loss in hardness there would be a 20% loss in compression strength as that is what it measures obviously.
As for the rest of it, what I have said is based on the actual materials data, grounded in basic metallurgy such as the reason for the strong hardening peak in SS is because of the precipitates of Cr which is why it is NEVER recommended to do that with stainless steels.
If you do want that hardness then you pick an alloy which is made to get it without having to take that loss of corrosion/impact toughness. Again, this is all basic metallurgy.
Now you could use a knife at 58 RC and find the edge roll dramatically, as many people have pointed out to you, including myself several times, this is NOT because the hardness is 58 HRC as that has a minor effect on the strength. What you are seeing is the effect of microstructure which is caused by :
-blown grain structure
or any combination of the same.
This is why you need to ensure proper micro-structure, and why you need to adjust the thermal processing to achieve the properties you want.
I think we should start a pool for actual as-delivered Rc on this one.
Thanks for the input Joe Really appreciated.
Thin edges, exotic steels. A great combo .