Abstract
A study of the aging behavior of an Fe-12 Ni-6 Mn alloy has been made. Rapid hardening was found to occur over a wide temperature range. Extraction of the overaged precipitate has been carried out and the precipitate identified as fct θ NiMn by electron diffraction. Studies of the effect of aging on the toughness and tensile ductility have shown that severe embrittlement occurs over a wide temperature range. The relationship between the hardening and the embrittlement was studied by comparison of “activation energies” determined from Arrhenius plots. It is suggested that embrittlement in this alloy is the result of segregation of manganese to prior austenite grain boundaries resulting in intergranular failure. To avoid embrittlement, aging was performed at temperatures above the embrittlement range which resulted in good toughness with moderate hardness.
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This paper is based upon a thesis submitted by D. R. SQUIRES in partial fulfillment for a higher degree of CNAA at Sheffield Polytechnic.
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Squires, D.R., Wilson, E.A. Aging and brittleness in an Fe-Ni-Mn alloy. Metall Trans 3, 579–585 (1972). https://doi.org/10.1007/BF02642065
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DOI: https://doi.org/10.1007/BF02642065