1084 grain size?

DevinT said:
Look up dynamic recrystallization.

Larrin did say that forging a knife from bar stock doesn’t do much but that is assuming the starting bar has fine grain.

I also asked if this material would be good for pattern welding which would require quite a bit of reduction.

And, lower your tone with me.

Hoss
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Hoss I was just asking for clarification for what was a very broad statement based off what I knew, I’m familiar with dynamic crystallization I just didn’t know if that would really apply in this scenario. Also I didn’t have a tone, Im here just trying to help same as you. Regardless of if the pattern welding process does help reset and refine the grain that won’t necessarily help someone that just wanted to use this steel for stock removal or forging a simple knife and maybe doesn’t have the ability or tools to use it for pattern welding. I likely won’t have time to test if it would work for pattern welding, keep in mind I’m not employed by Pops and don’t gain anything from running these tests other than trying to help out.
 
I would like to get some of this material and run a couple of tests on it. I think there might be a simple solution.

Hoss
 
DevinT said:
I would like to get some of this material and run a couple of tests on it. I think there might be a simple solution.

Hoss
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What are your thoughts for the simple solution? I’ve tried several different methods of cycling it with various temperatures. I’ll list what I tried below.
1650-1450-1450
1650-1500-1350
1900-1650-1500-1350
1900-1650-1450-1450
1650-1500-1450-1350
1650-1450-1450-1350-1350
1650-1450 (annealing)
1650-1500-1450 (annealing)
All the above I did 10-15 minute soaks at each temp minus the cycles listed at annealing where I did a 30 minute hold and slow cooled at 100F per hour down to 1000F then left in the oven as it cooled down normally. I made sure to coat pieces with anti scale or put in foil for the high temp cycles.
I’m probably forgetting a couple sequences as well, I even tried doing an excessive amount of grain refinement cycles to see if I could get the steel to a point it wouldn’t harden but that didn’t work either. All of the above I quenched at 1475 for 10 minutes going into parks 50, I also tried dropping the austenizing temp to 1450 and that didn’t help either. Some of the above may seem redundant but I wanted to try various temps to see if anything would have an effect.
 
I would try 1450 for 25 minutes, quench in parks 50, sub-critical anneal @ 1250 for 2 hours.

Austenitize at 1475

Normalizing is for refining the carbide size and distribution. Small evenly distributed carbides do pin the grain boundaries but this material is not responding to these treatments.

Quenching from Acm and a subcritical anneal might just work.

Hoss
 
DevinT said:
I would try 1450 for 25 minutes, quench in parks 50, sub-critical anneal @ 1250 for 2 hours.

Austenitize at 1475

Normalizing is for refining the carbide size and distribution. Small evenly distributed carbides do pin the grain boundaries but this material is not responding to these treatments.

Quenching from Acm and a subcritical anneal might just work.

Hoss
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Thank you, I’ll try that. I’ve got some sample already cut up but just ran out of ideas to try. I’m sorry if one of my previous posts seemed like it had a tone I definitely didn’t mean for it to come across that way. I’ll post back if this works.
 
Are you sure the oven is on Fahrenheit not Celsius.

Try this,

950 15 mins quench
790 10 mins quench
790 10 mins quench
790 10 mins quench
 
Way-Barney said:
Are you sure the oven is on Fahrenheit not Celsius.

Try this,

950 15 mins quench
790 10 mins quench
790 10 mins quench
790 10 mins quench
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Yes I’m absolutely sure it’s set to Fahrenheit, I heat treat out of the same oven quite frequently and ran some coupons of W2 that I had as a comparison and had no trouble getting really fine grain with the W2
 
Convert those from C to f then and try, if there is hardening due to carbon content it must respond. if not there might be no carbon in it and the hardness is possibly from something else.
 
DevinT said:
Any update on the Sheffield report?

Hoss
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I’ve not heard anything yet, I’ll make sure to post back as soon as I get an update from Pops, I don’t know how long it will take the mill to produce any information. I did reach out directly to the UK supplier to see if they have certs for their 1084 since they still have it available on their website. I’ve not heard back from them but I did send the message over the weekend. I’d call them but last time I did that I ended up with a $40 charge on my phone bill for a 10 minute call.
 
Use "whats app" for free international phone calls, do you have that APP over there? I used to spend £100 a month on calls to Ireland before I discovered that. Connections are not always %100 but nine times out of ten its serviceable
 
DevinT said:
Any news on this?

Hoss
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I haven’t heard anything yet, I’ll check again with pops this week and should have time this week to run your idea on some samples, trying to finish up 140 knives this weekend otherwise I’d run the samples today
 
R.C.Reichert said:
Is there such thing as over-cycling steel? 🤷
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I know you can technically over cycle and over refine the grain and make it where the steel becomes so shallow hardening that you can’t harden it but I don’t think that’s what going on here, it doesn’t seem to have trouble hardening just doesn’t look right and my guess would be the larger than ideal grain would lead to poor toughness/sharpenability
 
That batch of steel is cursed. Someone added the wrong amount of Eye of Newt when it was cooking in the cauldron.
 
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