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Evolution of Minor Phases in a 9PctCr Steel: Effect of Tempering Temperature and Relation with Hydrogen Trapping

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Abstract

The evolution of minor phases in ASTM A335 P91 steel has been studied on specimens submitted to different thermal treatments including a tempering step. Particular emphasis has been put on the tempering temperature range 573 K to 873 K (300 °C to 600 °C), which has not been yet intensively studied. The techniques used in this investigation were X-ray diffraction with synchrotron light, scanning electron microscopy with field emission gun and transmission electron microscopy. In the low tempering temperature range [573 K to 673 K (300 °C to 400 °C)], retained austenite, Fe3C and MX precipitates are observed. In the high tempering temperature range [773 K to 1053 K (500 °C to 780 °C)], M23C6-type carbides, MX-type carbonitrides and M2X precipitates are observed. The effect of the microstructure on hydrogen trapping is analyzed. The distorted matrix around the M2X and MX particles provides the most important trap sites in the P91 steel.

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Acknowledgments

The X-ray diffraction measurements have been carried out at the Brazilian Synchrotron Light Laboratory, Campinas, Brazil. This institution provided financial and technical support.

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Authors and Affiliations

  1. Comisión Nacional de Energía Atómica (Argentina), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina

    Carolina Hurtado-Noreña (Researcher), Claudio Ariel Danón (Researcher), María Inés Luppo (Researcher) & Pablo Bruzzoni (Researcher)

Authors
  1. Carolina Hurtado-Noreña
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  2. Claudio Ariel Danón
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  3. María Inés Luppo
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  4. Pablo Bruzzoni
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Correspondence to Carolina Hurtado-Noreña.

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Manuscript submitted August 13, 2014.

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Hurtado-Noreña, C., Danón, C.A., Luppo, M.I. et al. Evolution of Minor Phases in a 9PctCr Steel: Effect of Tempering Temperature and Relation with Hydrogen Trapping. Metall Mater Trans A 46, 3972–3988 (2015). https://doi.org/10.1007/s11661-015-3045-7

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  • DOI: https://doi.org/10.1007/s11661-015-3045-7

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