2721.     POMEY, J., GOUTEL, F., MOULIN, J., AND COUDRAY, R.  [Thermomagnetic Transformation of the Iron-Carbon-Nitrogen Alloys.]  Compt. rend., vol. 230, 1950, pp. 2196-2198; Chem. Abs., vol. 44, 1950, p. 10641.

        Fe-C-N alloys containing up to 1.5 N₂ and 1.25% C were prepared by cementation of 0.5-mm. wire of mild steel heated to 810° in a mixture of CO₂, H₂, and acetonitrile for N₂ content up to 0.6% and a slight addition of NH₃ for N₂ contents 0.6-1.5%.  These alloys showed the reversible thermomagnetic transformations of austenite in cementite Fe₃C and nitride Fe₄N.  This eutectoid transformation begins at 595°, as in the Fe-N alloys, but it is completed at a lower temperature than the Fe-N and Fe-C alloys.

        PONGRACZ, A.  See abs. 3373.

        PORAI-KOSHITS, E. A.  See abs. 3414.

        PORTER, D. J.  See abs. 2178.