Call for Charpy toughness samples

I thought you might say that, in that case would it be best to take them to clean up, or to get 1 side uniform, leave the mill finish in the other which is pretty uniform?
 
I'm just going to take to clean up. The m4 warped the worst so they'll be small but the elmax is still .110 and hasn't even been touched.

If they're taken to cleanup and same size within alloy at least the different aus temps can allow a comparison.
 
0.0974" is still within tolerance
 
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I have my oven now and will try to get a hardness test before long. If there was some sort of list even if its something quick I would be willing to do some coupons for a few more data points. I have a reasonable selection of steel and could toss something in my next order.
 
skillgannon said:
I have my oven now and will try to get a hardness test before long. If there was some sort of list even if its something quick I would be willing to do some coupons for a few more data points. I have a reasonable selection of steel and could toss something in my next order.
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OK I have updated the first page of this thread with requests.
 
I just hardened 4 1095 coupons and 5 52100 coupons all .187".
The bars were placed in my forge and soaked, cooled to black then i took them into my kiln.
I normalized, thermal cycled then quenched. 2 hour sub critical anneal. Then cut bars into coupons and hardened each one at different Aust temps. Ill be cleaning the coupons and hardness testing monday. If you'd like I can send them all to you after ai hardness test them. I wrote down every step of the process for mt test.
I have aus range of 1095 at 1435, 1450, 1475 and 1500 in parks 50
Aus range 52100 1480 11 second oil, 1475 parks 50, 1500 11 second oil, 1525 parks 50, 1545 11 second oil.
Both bars from AKS, the 52100 is technically Bohler R100
-Trey
 
comet_sharp said:
I just hardened 4 1095 coupons and 5 52100 coupons all .187".
The bars were placed in my forge and soaked, cooled to black then i took them into my kiln.
I normalized, thermal cycled then quenched. 2 hour sub critical anneal. Then cut bars into coupons and hardened each one at different Aust temps. Ill be cleaning the coupons and hardness testing monday. If you'd like I can send them all to you after ai hardness test them. I wrote down every step of the process for mt test.
I have aus range of 1095 at 1435, 1450, 1475 and 1500 in parks 50
Aus range 52100 1480 11 second oil, 1475 parks 50, 1500 11 second oil, 1525 parks 50, 1545 11 second oil.
Both bars from AKS, the 52100 is technically Bohler R100
-Trey
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Sounds cool. What was the hold time at austenitizing temperature? What are you tempering them at? Are you surface grinding them to final dimensions?
 
I
Larrin said:
Sounds cool. What was the hold time at austenitizing temperature? What are you tempering them at? Are you surface grinding them to final dimensions?
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Held the 1095 for 7 minutes and the 52100 for 10 minutes. I tempered 1 hour at 280°F all coupons first. Then 52100 at 325°F and 335°F for one hour. I'll be cleaning up the coupons on my grinder tomorrow with trizact belts and will surface grind at 400 grit before testing.
-Trey
 
Larrin, I did N690, M2 (low and high temper), Z-finit at higher hardness than the previous samples, 8670 at two hardnesses, and 52100 at two hardnesses. I have to apologize as I thought they were mailed weeks ago, but they didn’t get sent. My hardness tester is reading high, so I ordered a new indenter, and have the heat treat regime written out. My numbers are coming out thee or four points higher than expected, and my test block is reading the same.

My wife is going for an mri for memory problems. We think she might have had a mini stroke. I will personally mail them myself tomorrow.

I can commit to O1, 1084, 1095, W2, and have samples of v4e, Caldie, and a8mod sent by hugeo to heat treat. (Going from memory. I’ll double check.) I can do some 15n20 to compare with the weird results from earlier too.
 
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Willie71 said:
Larrin, I did N690, M2 (low and high temper), Z-finit at higher hardness than the previous samples, 8670 at two hardnesses, and 52100 at two hardnesses. I have to apologize as I thought they were mailed weeks ago, but they didn’t get sent. My hardness tester is reading high, so I ordered a new indented, and have the heat treat regime written out. My numbers are coming out thee or four points higher than expected, and my test block is reading the same.

My wife is go8ng for an mri for memory problems. We think she might have had a mini stroke. I will personally mail them myself tomorrow.

I can commit to O1, 1084, 1095, W2, and have samples of v4e, Caldie, and a8mod sent by hugeo to heat treat. (Going from memory. I’ll double check.) I can do some 15n20 to compare with the weird results from earlier too.
Click to expand...

Our sympathies. I hope everything goes ok Willie.
 
Willie71 said:
Larrin, I did N690, M2 (low and high temper), Z-finit at higher hardness than the previous samples, 8670 at two hardnesses, and 52100 at two hardnesses. I have to apologize as I thought they were mailed weeks ago, but they didn’t get sent. My hardness tester is reading high, so I ordered a new indenter, and have the heat treat regime written out. My numbers are coming out thee or four points higher than expected, and my test block is reading the same.

My wife is going for an mri for memory problems. We think she might have had a mini stroke. I will personally mail them myself tomorrow.

I can commit to O1, 1084, 1095, W2, and have samples of v4e, Caldie, and a8mod sent by hugeo to heat treat. (Going from memory. I’ll double check.) I can do some 15n20 to compare with the weird results from earlier too.
Click to expand...

Hello, Willie71, the samples I sent you are from V4e, A8mod, NZ3 (~S1) and Ultrafort (Maraging steel that, on theory, can reach 60hrc). Take your time, family first, hope everything goes well with your wife.

Best regards!
 
Figured I should post my findings here.
steel was 1095 and R100(52100) from Alpha Knife Supply
each bar was soaked in forge 1800+ for a short while and cooled to make sure the grain was NOT where i wanted to be
blades normalized for 15 minutes at 1650
thermal cycles
1500, 1475x2 quench on last
sub critical anneal, 1260 x 2 hours
bars of steel then cut into coupons and hardened. all coupons immediately tempered 1 hour at 280 and then 1 hour at 325 for 52100 and 335 for 1095.
Here are my results, took 3 readings on each coupon
1095
all coupons austentized for 7 minutes in an evenheat KF-18 and quenched in parks 50.
1435 - 63, 62.75, 63
1450 - 62.75, 63, 63
1475 - coupon hamoned and readings were null
1500 - 64.25, 64.25, 63.65

52100
all coupons austentized for 10 minutes in same evenheat, some quenched in parks 50 and some in Mcmaster 11 oil
my control was cut directly from AKS r100 stock and austentized at 1480 for 10 minutes and quenched in medium oil. read 56, 55.75, 55.75RC with 325 temper
1475F, parks 50 - 61, 61.5, 61.5
1500F, mcmaster11 - 59.5, 60, 59.5
1525F, parks 50 - 62.5, 62.75, 63
1545F, mcmaster 11 - 62.5, 63, 63.25

The 52100 really opened my eyes, I want to do more coupons with an increase in soak time. As of now 52100 gets hardened at 1525F witha 15 minute soak and parks 50 quench for kitchen knife use in my shop.
Thanks,
Coupons are available for scrutiny if anyone is interested.
 
I’m curious as to the reproducibility of your results. Have you tested the same steel with the same HT several times ? What is the imprecision of the measurement ?
 
I haven’t tested any without three samples per condition. All the data points are shown in the Z-Wear article where you can see the spread. Toughness is more variable than some other kinds of tests and more samples are better.
 
Hey larrin I’m going to be doing some thin A2 knives for the wife. I would be happy to bust out a handful of coupons for testing. I also can do some D2 at the same time with a pre quench and cryo. Is there any interest in somthing as extream as S5? Been tossing around the idea of getting a stick of it to forge out.
 
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