Call for Charpy toughness samples

Thanks, Chuck!! And you, too, Warren. :) I just ordered some thicker AEB-L from Chuck, enough to do at least 40 test coupons (4 ea x 10 conditions). Might have to ask for some help surface grinding, I have one on order but Mr. Wuertz is a pretty busy guy and it is looking like end of the year...
 
Michael.Drinkwine said:
Thanks, Chuck!! And you, too, Warren. :) I just ordered some thicker AEB-L from Chuck, enough to do at least 40 test coupons (4 ea x 10 conditions). Might have to ask for some help surface grinding, I have one on order but Mr. Wuertz is a pretty busy guy and it is looking like end of the year...
Click to expand...


So far we have DevinT (super busy) JT, and Chuck at aks surface grinding. I just posted on knifemaker whiteboard https://www.facebook.com/groups/1334550390015523/?ref=bookmarks asking for volunteers to help with samples and grinding. We’ll see who responds. When I was at the southern Alberta hammer in four years ago, we had Kevin Cashen presenting, and out of nearly 300 knife makers, only five of us took Kevin up on his presentations. I overheard others saying the “nerds overthink this stuff. Get it red hot and quench is all that’s needed.” We are more informed here than that, but that’s what we’re up against.
 
Last edited:
I will happily add my name to the list for surface grinding once I get mine. In the meantime I've got an idea for a jig for my disc sander. It won't work for blades, but just might be perfect for coupons. Let me see what I can do on that.
 
jQ7F8o5.jpg

5MjpBms.jpg


Working on some Nitro V
 
Wllie ' we live in a time when "little things mean a lot " in metallurgy, cooking , etc, etc. To ignore the little things is foolish. let's take advantage of them.

Deadbox , no surprise in those hardnesses . Of course each alloy is a little different !
 
Chuck Bybee, A point I should have asked about earlier . I did a good bit of work in the bearing industry and I wondered which grade of 52100 did you Use . There's bearing , aircraft , and other types . Might make some difference .
 
mete said:
Chuck Bybee, A point I should have asked about earlier . I did a good bit of work in the bearing industry and I wondered which grade of 52100 did you Use . There's bearing , aircraft , and other types . Might make some difference .
Click to expand...

I think their stuff is Bohler and has extremely low impurity levels. Very close to 1%c and 1.5 cr. Good stuff.

Hoss
 
DeadboxHero said:
They're all Nitro V.
Click to expand...

Ok. I have two more conditions in aeb-l, but I’ll see what Michael.Drinkwine has going on. I did 1750f pre-quench, 1975x5min, plate quench, cryo, 250f temper 2hx2, and 350f temper 2hx2. I got Rc62 and Rc59.5 with these samples. I was going to do two more samples tempered at 300f, and 200f. If he didn’t pre-quench, I’ll do these samples for comparison. If he did, were being redundant.

Edit: my tester hasn’t been consistent. My new diamond indented hasn’t come yet.
 
What's the most efficient way process these samples? Are you doing 3 of each 2.5x 10x55mm or a larger coupon that needs to be cut into 3 pieces?

Willie71 said:
Ok. I have two more conditions in aeb-l, but I’ll see what Michael.Drinkwine has going on. I did 1750f pre-quench, 1975x5min, plate quench, cryo, 250f temper 2hx2, and 350f temper 2hx2. I got Rc62 and Rc59.5 with these samples. I was going to do two more samples tempered at 300f, and 200f. If he didn’t pre-quench, I’ll do these samples for comparison. If he did, were being redundant.

Edit: my tester hasn’t been consistent. My new diamond indented hasn’t come yet.
Click to expand...
 
DeadboxHero said:
What's the most efficient way process these samples? Are you doing 3 of each 2.5x 10x55mm or a larger coupon that needs to be cut into 3 pieces?
Click to expand...

For air hardening steels, I’ve been cutting about 1mm oversized, and putting the three pieces in the same piece of foil. If the aust temp is the same, I heat treat all samples together, temper all at the lowest temper, then temper each set at the next temper. For oil/water hardening steel, I cut the sample to have 12mm wide tines as if I was making a fork. The length of the tines depends on how many samples I need. I quench, temper once at the lowest temper, then cut the pieces into 55mm lengths and temper each condition as needed. I avoid cutting lengthwise after heat treat, as I’m worried about the effect of the heat on the temper. Cutting at 55mm King is kess of an issue, as the anvils are 40mm apart. This is a time consuming process.

Larrin, correct me if I’m wrong.
 
Willie71 said:
Ok. I have two more conditions in aeb-l, but I’ll see what Michael.Drinkwine has going on. I did 1750f pre-quench, 1975x5min, plate quench, cryo, 250f temper 2hx2, and 350f temper 2hx2. I got Rc62 and Rc59.5 with these samples. I was going to do two more samples tempered at 300f, and 200f. If he didn’t pre-quench, I’ll do these samples for comparison. If he did, were being redundant.

Edit: my tester hasn’t been consistent. My new diamond indented hasn’t come yet.
Click to expand...

I just received the thicker AEB-L stock from AKS today, so I haven't done any coupons yet. I've attached a pic of what I have planned, let me know which test numbers you haven't done or aren't planning to do and I will make sure those get done. No sense in doing it multiple times, though!

I am in awe of the level of participation by some of the members of this forum, and the level of personal expense and effort you are willing to go to in order to advance public knowledge. Kudo's to you.

Michael
 

Attachments

  • AEB-L Tests.JPG
    AEB-L Tests.JPG
    87.3 KB · Views: 8
Michael.Drinkwine said:
I just received the thicker AEB-L stock from AKS today, so I haven't done any coupons yet. I've attached a pic of what I have planned, let me know which test numbers you haven't done or aren't planning to do and I will make sure those get done. No sense in doing it multiple times, though!

I am in awe of the level of participation by some of the members of this forum, and the level of personal expense and effort you are willing to go to in order to advance public knowledge. Kudo's to you.

Michael
Click to expand...


Please see post 372. I did two conditions so far, and am waiting for steel for more. I’ll stop if you are planning to do more. I’d suggest using 200f and 300f tempers, for sure.
 
Warren, I've added your results from post# 372 to my test sheet, thanks. Wasn't sure if you had additional ones I had missed. I will go through the tests I have listed first and then we can regroup on the next round for the additional tempering temps. I have to admit I'm curious as to the toughness tempering =<300*F will give.
 
I may have missed it but any chance of doing Vanax at 60-61 to see how it stacks up as well as doing a2 and o1 as a sort of baseline then maybe s7 as the top haha? I check this thread daily thanks for all you guys have done.
 
Tin.Man said:
I may have missed it but any chance of doing Vanax at 60-61 to see how it stacks up as well as doing a2 and o1 as a sort of baseline then maybe s7 as the top haha? I check this thread daily thanks for all you guys have done.
Click to expand...


I’ve got vanax from Chuck for the next round. O1 is on the list of steels I want to heat treat before sending this batch for surface grinding. A2 is in the mail, and will be in the next round. S7- not on my current list but I think JT is working on S5.
 
You must log in or register to reply here.
Back
Top