Abstract
The form of nitrogen in Cr, Ni·Cr and Ni·Cr·Mo steels, which has hitherto been almost unknown, was minutely studied by the authors with the experiment. The present method of observation is based on the determination of N2 percentage in both HCl solution and HCl insoluble residue in the common distillation method, which change due to various heat treatments. The results obtained are briefly summarized as follow:(1) At the quenched state, almost all the nitrogen will be dissolved in austenite or martensite of Cr, Ni·Cr or Ni·Ci·Mo steels.(2) Tempering at high temperatures will cause most of the nitrogen to separate out as (Fe, Cr, N)3C, i. e., almost all nitrogen atoms will be dissolved in the space lattice of Fe3C with Cr atoms.(3) Nickel and molybdenum have no influence on the nitrogen separation.(4) This nitrogen separation has a critical point which occurs at the amount of Al 0·05%, i. e., when aluminium in these steels exceeds 0·05%, the phenomenon will suddenly disappear.(5) Titanium will fix about 93% of the nitrogen in liquid steel as nitride (probably the maximum amount of titanium nitride), when 0·7% of Ti exists in these steels in a form capable of being soluble with HCl.
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