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Lattice changes of iron-nitrogen martensite on aging at room temperature

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Abstract

The aging behavior of iron-nitrogen martensite (5.5 at. pct N ≙5.8N/100Fe) at about 297 K was investigated by employing X-ray diffractometry, thereby following, in particular, the changes in the {002} and {200} line profiles. Martensitic specimens were prepared by gaseous nitriding of pure iron in a mixture of NH3 and H2, followed by quenching in brine and subsequently in liquid nitrogen. The aging process can be divided into two stages. First, a redistribution of nitrogen atoms in the martensite matrix occurs (aging time < about 40 hours) in three ways: segregation of nitrogen to lattice defects (about 0.07N/100Fe), transfer of a small amount of nitrogen (about 0.06N/100Fe) fromalb- toc-type octahedral interstices, and local enrichment in an ordered way of the majority of the nitrogen atoms (coherent α′’-Fe16N2 precipitates). Second, formation of incoherent α″-Fe16N2 takes place (aging time > about 40 hours). Within the range of aging times employed (up to 670 hours), the diffraction by the residual austenite did not change.

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Authors and Affiliations

  1. Laboratory of of Metallurgy, Delft University of Technology, 2628, AL Delft, The Netherlands

    LIU Cheng (Graduate Student), N. M. van der Pers (Research Assistant), A. Böttger (Scientist), Th. H. de Keijser (Senior Scientist) & E. J. Mittemeijer (Professor)

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  1. LIU Cheng
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  2. N. M. van der Pers
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  3. A. Böttger
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  4. Th. H. de Keijser
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  5. E. J. Mittemeijer
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Cheng, L., van der Pers, N.M., Böttger, A. et al. Lattice changes of iron-nitrogen martensite on aging at room temperature. Metall Trans A 21, 2857–2867 (1990). https://doi.org/10.1007/BF02647206

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