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Metastable precipitate in a duplex martensite + Ferrite Precipitation-Hardening Stainless Steel

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Abstract

The crystal structure and chemical composition of the strengthening precipitates in an Fe- 11.8 pct Cr-8.5 pct Ni-1.8 pct Ti-3.8 pct Mo martensite + ferrite duplex steel were determined by transmission electron microscopy (TEM). The study revealed that a metastable precipitate phase formed in the ferrite and martensite phases during the initial stages of aging. The meta- stable phase was proposed to have a hexagonal crystal structure similar to that reported for the omega phase in Ti alloys. Prolonged aging formed an equilibrium orthorhombic precipitate phase with a Ni3(Mo, Ti) stoichiometry. The higher dislocation density in martensite accelerated the precipitation reaction, and the transition to the equilibrium precipitate occurred with shorter aging times compared to ferrite. The details of the electron diffraction and analytical electron microscopy studies of the precipitates are described.

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Authors and Affiliations

  1. STEM, Inc., 06460, Milford, CT

    Raghavan Ayer

  2. Ethicon, Inc., 08876, Somerville, NJ

    L. P. Bendel (Manager, Materials Engineering)

  3. 06840, New Canaan, CT

    V. F. Zackay (Consultant)

Authors
  1. Raghavan Ayer
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  2. L. P. Bendel
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  3. V. F. Zackay
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Ayer, R., Bendel, L.P. & Zackay, V.F. Metastable precipitate in a duplex martensite + Ferrite Precipitation-Hardening Stainless Steel. Metall Trans A 23, 2447–2453 (1992). https://doi.org/10.1007/BF02658048

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  • DOI: https://doi.org/10.1007/BF02658048

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