Abstract
THE recent communication in NATURE by Túry and Krausz1 may be helpful regarding work on the plastic distortion of metals and, in particular, on the nature of the yield point. In their letter, Fig. 1, No. 2, shows a load-extension curve for molybdenum wire after a certain treatment and involving the use of nitrogen at 1,300° C. for 20 sec. This curve closely resembles the well-known load-extension curve for iron and soft steel, apart from a horizontal portion at the top of the curve. Fig. 1, No. 1, shows a curve for wire treated in hydrogen only, but no such yield point is shown in this case. The shape of the curves may be partly due to the different treatments affecting the crystal size, and it would be useful to know the size of the crystals in the wire and to know the behaviour of iron wire after similar treatments. In this connexion, data2 given by Arrowsmith for Armco iron show that for material in which the crystal width was approximately 0.11 mm. did not have a marked yield point, but for a crystal width of approximately 0.07 mm. there was a considerable yield. Curves given by Edwards and Pfeil3 suggest that for aggregates of iron crystals the marked yield may not occur when the crystals are wider than approximately 0.25 mm. or 0.4 mm.
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References
NATURE, 138, 331 (August 22, 1936).
J. Iron and Steel Inst., 110, 317 (1924).
J. Iron and Steel Inst., 112, 98, Fig. 9 (1925).
E. W. Fell, ” The Piobert Effect in Iron and Soft Steel”, J. Iron and Steel Inst., 132, 75 (1935).
J. Iron and Steel Inst., 133, 389P (1936)
J. Iron and Steel Inst., 109, 82 (1924).
” The Distortion of -Brass and Iron Crystals”, Proc. Roy. Soc., A, 153, 273 (1936).
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FELL, E. Distortion of Iron and Molybdenum. Nature 138, 760 (1936). https://doi.org/10.1038/138760a0
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DOI: https://doi.org/10.1038/138760a0
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