Abstract
Interstitial-free Fe-P alloys (0.083, 0.23 and 0.40 at. pct P) and a rephosphorized low-carbon steel were strained 4 pct in tension, aged isothermally at temperatures between 373 and 723 K, then strained to fracture at room temperature. The yield strength increment of the Fe-P alloys increases with aging time, reaches a maximum, then decreases. As with other substitutional solutes, only the first stage of strain aging was seen; the UTS and elongation remained unchanged. Phosphorus is more effective than other substitutional solutes in causing strain aging. Because of the limited solubility of P in α-Fe, increasing creasing the P content from 0.083 to 0.40 at. pct had only a slight effect on strain aging. The activation energy for strain aging is about 220 kJ/mole, indicating that aging is controlled by lattice diffusion of P. When both interstitial and substitutional solutes are present, as in the rephosphorized steel, aging by interstitials masks any aging by P.
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E. J. DZIURA, formerly Graduate Student, Department of Materials and Metallurgical Engineering, University of Michigan, is now with the
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Li, C.C., Dziura, E.J. & Leslie, W.C. Static strain aging of α-Fe-P alloys. Metall Trans A 8, 705–709 (1977). https://doi.org/10.1007/BF02664780
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DOI: https://doi.org/10.1007/BF02664780