Alloy hardness after cool down, 3 days and 7days

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GrumpyBear
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Re: Alloy hardness after cool down, 3 days and 7days

Post by GrumpyBear » Wed Oct 20, 2021 7:22 am

desert deuce wrote:
Sun Oct 17, 2021 10:21 pm
Congrats Ian, good shooting.
Agreed DD, Ian is a good shot and a good spotter,and a good friend, at the Hepsworth match he spotted for himself, so deserves that recognition.

Aviator
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Joined: Mon Sep 03, 2018 8:06 pm

Re: Alloy hardness after cool down, 3 days and 7days

Post by Aviator » Wed Oct 20, 2021 8:20 am

Hopefully we will see scores and a report from the HepSworth match!

mdeland
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Re: Alloy hardness after cool down, 3 days and 7days

Post by mdeland » Wed Oct 20, 2021 4:38 pm

Same alloy ,water dropped , registering 7 when recovered ,at plus 20 hours is BHN 11, almost twice what the same alloy without water drop registered at 6.

mdeland
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Joined: Mon Nov 20, 2006 1:47 pm

Re: Alloy hardness after cool down, 3 days and 7days

Post by mdeland » Wed Oct 20, 2021 4:47 pm

That's quite interesting to me as I had always thought that water dropping set the hardness at the quench but this apparently is not the case as the water drop started at 7 and in less than 24 hours has progressed to 11.
Now I'm wondering what effect water drop quenching has on stability over time and does lead/ tin alloy react similarly or completely different.

mdeland
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Re: Alloy hardness after cool down, 3 days and 7days

Post by mdeland » Wed Oct 20, 2021 4:52 pm

I think I still have some 30-1 ingots left and if so I will cast up some of the same bullets and water drop them to see how they react without the Antimony to water drop quench.

mdeland
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Re: Alloy hardness after cool down, 3 days and 7days

Post by mdeland » Wed Oct 20, 2021 8:30 pm

30-1 alloy ,water dropped ( approx 50* F. ) same as all other water drop temp, was BHN 6 . I'm anxious to see how the hardness and stability develops.

ian45662
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Re: Alloy hardness after cool down, 3 days and 7days

Post by ian45662 » Wed Oct 20, 2021 9:08 pm

Aviator wrote:
Wed Oct 20, 2021 8:20 am
Hopefully we will see scores and a report from the HepSworth match!
If someone wants post a picture of the scores I can e Mail it to them for posting. I am away from my computer traveling to another match :D

mdeland
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Re: Alloy hardness after cool down, 3 days and 7days

Post by mdeland » Thu Oct 21, 2021 9:05 pm

Another surprise; 30-1 lead/tin, water dropped, plus 30 hours are 11.5 BHN from a start of 6 BHN. I did not know previously that water dropped lead/tin would quench harden. I had always thought antimony was necessary for this to occur .
The only possible error I can invision is perhaps the mis- marking of these alloy ingots but I don't think it very likely.

mdeland
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Re: Alloy hardness after cool down, 3 days and 7days

Post by mdeland » Thu Oct 21, 2021 9:16 pm

This means that the lead/tin reacted almost exactly the same to a water quench as did the 50-50 lead/tin/antimony mix. Now the question of linear stability on a similar time line peaks my interest. I wonder if the water quench will have a stabilizing effect on the lead /tin alloy to prevent the slip in hardness over a years time ?
I do know my .44 cal WW alloy has sustained it's hardness level within 2 BHN of when they were cast over 15 years ago.

mdeland
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Joined: Mon Nov 20, 2006 1:47 pm

Re: Alloy hardness after cool down, 3 days and 7days

Post by mdeland » Thu Oct 21, 2021 9:42 pm

Considering the potential advantage to this BBBBBBBBBBBig IF and that being a simple method to stabilize lead/tin alloy hardness over time, might possibly just advance bullet shape integrity both at bump up and in flight.
I believe I read some where in history that mercury added to lead/tin alloy was experimented with in this regard, No ?

mdeland
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Re: Alloy hardness after cool down, 3 days and 7days

Post by mdeland » Thu Oct 21, 2021 10:03 pm

Oh, almost forgot, this is day seven and the original 50/50 WW/lead mix, without water quench, is holding at 8.5 - 9 BHN.

mdeland
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Re: Alloy hardness after cool down, 3 days and 7days

Post by mdeland » Fri Oct 22, 2021 9:27 pm

I made an error on the water drop 30-1 lead/tin alloy hardness testing! I went back again tonight and retested the alloy not believing the results I got the other evening. They tested 6 just as they did when recovered from the quench. That means I tested from the wrong sample which were actually the 50/50 mix.
My bad, I had to correct the error I posted once I discovered the mistake. The 30-1 did not quench harden at all over the time since they were cast.

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