Does anyone know of a paper that demonstrates a plot or mathematical model of the density of austenitic steel as a function of nickel content at STP? I am working on a paper where I need to know the density of austenitic steel at standard temperature and pressure (STP) as a function of nickel content.
The question seems at a glance like it should be trivial, but it is not that simple. Nickel atoms are slightly heavier and larger than iron. As nickel replaces iron in austenite, the FCC unit cell gets heavier but also gets more spacious. The increasing mass is probably linear with nickel content, while the increasing volume is probably not linear w/[Ni]. Further complicating the question is that austenite with very low [Ni] is unstable below the transition temperature curve, while the data I need must be at atmospheric temperature and pressure. So simple, yet so complex!
I made a plot (below) of data taken from x-ray diffraction PDF cards from the 04-XXX-XXXX subfile, about 28 cards total of Fe-Ni alloys of point group 225 at STP, and the scatter is huge regardless of a linear or nonlinear best-fit curve. I suspect some of the cards were not measured at STP, confused mass% with mole%, or contained other unspecified elements in more than trace amounts. I am hoping to find something a little more definitive than this, but I have had no luck finding any such paper.
Richard ChinnNational Energy Technology Laboratoryrichard.email@example.com
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