3668. WESTGREN, A., AND LINGH, A. E. [Crystal Structure of Iron and Steel.] Ztschr. physik. Chem., vol. 98, 1921, pp. 181-210; Chem. Abs., vol. 15, 1921, p. 3812.
Deals with an X-ray spectrographic investigation of the crystal structure of Fe and steel. The results of Hull (abs. 1516) that the atoms of pure Fe at ordinary temperature (a-Fe) are arranged on a centered cubic lattice, have been confirmed. At 800°-830° that is, within the so-called β-Fe interval, the atoms are grouped in the same way as in a-Fe. Since allotropy of crystalline solids is synonymous with polymorphism, β-Fe cannot be regarded as a special modification of Fe. In both austenite and pure Fe, which is stable at 1,000°, the crystals have a plane-centered cubic lattice. This is also characteristic of γ-Fe, and constitutes a fundamental difference between a- and γ-Fe. In martensite the Fe appears in the form of the a modification. This is likewise the case in rapid-drawn steel of ordinary composition that has been hardened at 1,275°.