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

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Abstract

The aging behavior of iron-carbon martensite (5.1 at. pct C = 5.3C/100Fe) at about 297 K was studied by analyzing, in particular, the changes in the {002} and {200} diffraction line profiles obtained by X-ray diffractometry. Martensitic specimens were prepared by gaseous carburizing of pure iron in a mixture of H2 and CO, followed by quenching in brine and subsequently in liquid nitrogen. The aging process can be divided into two stages. First, a redistribution of carbon atoms in the martensite matrix occurs in four ways (aging time < about 50 hours): (1) segregation of carbon to lattice defects (about 0.21C/100Fe), (2) transfer of carbon from thea/b- type toc-type octahedral interstices in the bulk of the martensite (0.13C/100Fe), (3) transfer of carbon fromc-type toa/b- type interstices at locations of significant stress variation, and (4) formation of carbon enrichments (clusters) in the matrix in which the majority of the carbon atoms is involved. Second, coarsening of the clusters occurs (aging time > about 50 hours) leading to diffraction by the matrix independent of the clusters. Within the range of aging times employed (up to 2 years), the diffraction by the retained austenite did not change.

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Authors and Affiliations

  1. Laboratory 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-carbon martensite on aging at room temperature. Metall Trans A 22, 1957–1967 (1991). https://doi.org/10.1007/BF02669863

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