Thread: Cooked my brass, Whoops

I too would err on the side of caution, but it would be interesting to do the crush test with pliers to see how much softer they are than virgin brass.

Where'd you get that graph from @Puffin ?

Sent from my GT-I8190T using Tapatalk

Originally Posted by Feather or Shoot

Where'd you get that graph from @Puffin ?

Hmmm... tricky to recall now, but my best guess would be that I copied it from a posting by The Firing Line & Shooters' Forum stalwart Unclenick. It appears to be taken from a metallurgy text.

@Feather or Shoot I recently came across the following:
http://web.nchu.edu.tw/~jillc/me/Ch1...0Treatment.pdf
Pages 33-37

Originally Posted by Puffin

@Feather or Shoot I recently came across the following:
http://web.nchu.edu.tw/~jillc/me/Ch1...0Treatment.pdf
Pages 33-37

That's some confusing stuff @Puffin!

I get that softening happens during the re crystallization temperature boundaries of 200& 500°C. I don't get how they don't show time on that graph. They then refer to the annealing of brass at 580°C being totally re crystallized after 8 seconds.
Interesting that the more worked brass is the less temperature it takes to anneal.

In the steel section they talk of age hardening at low temperatures for long times, I wonder if brass age softens when treated the same.

Any idea what hardness we are aiming for when annealing cartridge brass?

Sent from my GT-I8190T using Tapatalk

Originally Posted by Feather or Shoot

That's some confusing stuff @Puffin!

I get that softening happens during the re crystallization temperature boundaries of 200& 500°C. I don't get how they don't show time on that graph. They then refer to the annealing of brass at 580°C being totally re crystallized after 8 seconds.
Interesting that the more worked brass is the less temperature it takes to anneal.

In the steel section they talk of age hardening at low temperatures for long times, I wonder if brass age softens when treated the same.

Any idea what hardness we are aiming for when annealing cartridge brass?

Sent from my GT-I8190T using Tapatalk

Agree. I'm assuming that time is fixed, but no figure has been given, and then the crossing of the data plots in figure 10-33 is unintuitive. Also online searches reveal a differing in opinion over whether low temperature "age" annealing is possible. If I was sufficiently motivated I'd spend a day up at the VUW library trying to get to the bottom of it as it is in the area of my educational background, but my DIY inductive annealer has recently appeared to result in a halving of vertical dispersion out to 1000 metres so I'm content at the moment to engage in casual reading on the topic, follow the debate in an ill-informed manner, while enjoying the practical benefits !

Originally Posted by Puffin

Agree. I'm assuming that time is fixed, but no figure has been given, and then the crossing of the data plots in figure 10-33 is unintuitive. Also online searches reveal a differing in opinion over whether low temperature "age" annealing is possible. If I was sufficiently motivated I'd spend a day up at the VUW library trying to get to the bottom of it as it is in the area of my educational background, but my DIY inductive annealer has recently appeared to result in a halving of vertical dispersion out to 1000 metres so I'm content at the moment to engage in casual reading on the topic, follow the debate in an ill-informed manner, while enjoying the practical benefits !

Always wanted to do a DIY induction annealer. Where'd you get the parts and plan from? Or is this original puffin magic?

Sent from my GT-I8190T using Tapatalk