Dear Colleagues,
do you have any idea on possible medium/high embrittlement of a Cu-Sn (say 12wt%) alloy in some melting/remelting process in a metallurgical (channel furnace)?
A colleague from the industry is looking for some kind of advice/discussion.. so he asked me.
As you know channel induction furnaces have a
I did not find much, apart from this (relatively recent) paper:
Article Intermediate temperature embrittlement of copper alloys
Before trying a not impossible approach, based on Sindo Kou anc collaborators
Article A Simple Test for Assessing Solidification Cracking Suscepti...
which in my personal opinion is based basically.. on the -- derivative of the solid fraction - so something close to the (GRF) Growth Restriction Factor of alloys and grain size on solidification and on Pandat MDTCU copper databases). The thing is slightly different from GRF as this is defined ad GRF-> Q=dT/dfs and then (empirically or theoretically) d=a+b/Q computationally well defined by the Kozlov Schmid Fetzer paper..Article Thermodynamic aspects of grain growth restriction in multico...
So.. from the above Sindo Kou paper, precisely
from "A simple test for assessing solidification cracking susceptibility and checking validity of susceptibility prediction", ( Acta MaterialiaVolume 143, 15 January 2018, Pages 181-197)
"Cracking during solidification is a serious defect in welding and casting. The crack susceptibility of one Al alloy relative to that of another has been predicted recently using the maximum steepness |dT/d(fS)1/2| as the crack susceptibility index, where T is temperature and fS the fraction solid."
So my questions:
1) On one side, I also would like to understand if some - even practical - information is available. Normally is much better to base theory on experiments instead of real developments on theoretical speculations..
2) However on the other I am quite wondering to work out some calculations on the MDTCu Pandat database and on the much less serious Copper (open) database that I have been erratically developing over these years.. Because I believe that not that many researchers have considered it for copper alloys which, by the way, are a little neglected by the scientific (one I would have said metallurgical) community..
Attached in the excel file a simple ( Cu-Sn12Wt%) Scheil simulation of solidification obtained by Computherm Pandat and "my" open copper database.
Buongiorno Prof. Miani
ho passato quasi 10 anni della mia vita professionale lavorando nell'industria delle leghe di rame. Uno dei miei progetti si occupo' negli anni '90, di leghe di CuSn, fino al 15 %.
Volentieri discuterei con Lei, e forse con il suo collega, i dettagli del suo problema.
Forse per Skype ?
Cordiali saluti
By the way :
"Copper and its alloys generally display a severe reduction in ductility between roughly 300 and 600 °C, a phenomenon variously called 'intermediate temperature embrittlement' or 'ductility trough behaviour' "
This is not really correct, pure copper doesn't show intermediate brittelness as well as many others Cu alloys.
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