Letter | Published:

Change of Length during Transformation of Iron under Stress

Abstract

IT is well known1 that various metallic materials are mechanically weak while being transformed into another allotropic modification. We measured the change of length of specimens of pure iron2 while the metal, kept under tensile stress, was heated through the transformation temperature at 910° C. In Fig. 1 the change of length for fine-grained iron has been plotted for one α–γ transformation, one γ–α transformation and for a complete α–γ–α cycle as a function of stress. The resultant strain for the complete cycle gives a straight line through the origin. The fine-grained material for these experiments was obtained by loading the iron with a small amount (0.008 per cent by weight) of nitrogen3. All measurements were made in vacuo. An iron–carbon alloy containing 0.2 per cent by weight of carbon behaves in essentially the same way when given a temperature cycle through the two-phase field α + γ.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1

    Sauveur, A., Iron Age, 113, 581 (1924). Scheil, E., Z. anorg. allg. Chem., 207, 21 (1932). Wassermann, G., Arch. Eisenhüttenw., 6, 347 (1933); 10, 321 (1937); 11, 89 (1937).

  2. 2

    Fast, J. D., and Luteyn, A. I., Philips Tech. Rev., 15, 73 (1949).

  3. 3

    de Jong, M., and Rathenau, G. W., Acta Metall., 5, 679 (1957).

  4. 4

    Bibring, H., and Sebilleau, F., C.R. Acad. Sci., Paris, 244, 1496 (1957).

  5. 5

    Basinski, Z. S., and Hume-Rothery, W., Proc. Roy. Soc., A, 229, 459 (1955).

  6. 6

    Lehr, P., C.R. Acad. Sci., Paris, 242, 1172 (1956).

  7. 7

    Bowles, J. S., and Barrett, C. S., “Progress in Metal Physics”, 3, 2 (London, 1952).

  8. 8

    Wechsler, M. S., Liebermann, D. S., and Read, T. A., Trans. Amer. Inst. Min. Met. Eng., 197, 1503 (1953). Chang, L. C., and Read, T. A., ibid., 189, 47 (1951). Burkart, M. W., and Read, T. A., ibid., 197, 1516 (1953).

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.