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- Jan 17, 2008
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ok, so bear with me through this, i may answer my own question from the title of the post, but need confirmation....so i did up a 19 layer stack of mokume, with .020 sheets of copper and nickel silver.
my process in short version was cut,clean,soak in 3/4'' plates in ht oven at 1650 for just over an hour, plates were tightened while under the pressure of my forging press so i know they were tight.
everything looked great.....actually perfect, which was a real supprise. so after touching up the edges on the grinder i heated and quenched from around 900deg f. then tried to roll in my rolling mill, instantly got a slight sepperation, ground it out, but it seemed to be all the way through. so i split and figured id work the two halves seperately. (making rings btw) i tried working at 1200deg f, tried working under the pres, annealed, in the rolling mill, hot,cold, etc it just kept coming apart. one a small piece i did by hand was going ok, but fail when i put in the rolling mill.
my two conclusions
1, i needed either higher temp, or longer soak time or both to complete the full diffusion process
2. i was trying to take to big of a bite at one time with the rolloing mill.
i think both seem to be valid explanations, but woulod be interested in hearing others ideas. (got one week to have two wedding bands done....
)
ok heres some pics
ready to sand and clean
the plates
tightening the bolts under pressure
the face of these was surface ground before using
homemade charcoal
filling around billet with crushed charcoal i made
i sealed it off with masking tape to prevent it from just falling out before getting into oven.
doubled s.s. foil pouch
in for a soak @1650 f
little over an hour later, out of oven and under press, few light squeezes, then a press and hold till most of the glow was gone
PERFECTION......OR SO I THOUGHT,not totally convinced it wasnt perfect, im leaning towards a combination of technique working the material afterwards, and the not long enough soak.
either way here is the billet complete, and this is the billet that ended up seperating till it was totally trashed.
any thoughts?
my process in short version was cut,clean,soak in 3/4'' plates in ht oven at 1650 for just over an hour, plates were tightened while under the pressure of my forging press so i know they were tight.
everything looked great.....actually perfect, which was a real supprise. so after touching up the edges on the grinder i heated and quenched from around 900deg f. then tried to roll in my rolling mill, instantly got a slight sepperation, ground it out, but it seemed to be all the way through. so i split and figured id work the two halves seperately. (making rings btw) i tried working at 1200deg f, tried working under the pres, annealed, in the rolling mill, hot,cold, etc it just kept coming apart. one a small piece i did by hand was going ok, but fail when i put in the rolling mill.
my two conclusions
1, i needed either higher temp, or longer soak time or both to complete the full diffusion process
2. i was trying to take to big of a bite at one time with the rolloing mill.
i think both seem to be valid explanations, but woulod be interested in hearing others ideas. (got one week to have two wedding bands done....
)ok heres some pics
ready to sand and clean
the plates
tightening the bolts under pressure
the face of these was surface ground before using
homemade charcoal
filling around billet with crushed charcoal i made
i sealed it off with masking tape to prevent it from just falling out before getting into oven.
doubled s.s. foil pouch
in for a soak @1650 f
little over an hour later, out of oven and under press, few light squeezes, then a press and hold till most of the glow was gone
PERFECTION......OR SO I THOUGHT,not totally convinced it wasnt perfect, im leaning towards a combination of technique working the material afterwards, and the not long enough soak.
either way here is the billet complete, and this is the billet that ended up seperating till it was totally trashed.
any thoughts?
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