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Metallurgical and Materials Transactions A

, Volume 40, Issue 2, pp 292–301 | Cite as

Influence of Sintering under Nitrogen Atmosphere on Microstructures of Powder Metallurgy Duplex Stainless Steels

  • C. García
  • F. MartinEmail author
  • Y. Blanco
  • M.P. de Tiedra
  • M.L. Aparicio
Article

Abstract

Duplex stainless steels (SS) obtained through powder metallurgy (PM) from austenitic AISI 316L and ferritic AISI 430L powders were mixed in different amounts to obtain a biphasic structure with an austenite/ferrite ratio of 50/50, 65/35, and 85/15. Prepared powders were compacted at 750 MPa and sintered in N2-H2 (95 pct–5 pct) at 1250 °C for 1 hour. Some samples sintered in vacuum were taken as references. Optical metallography, X-ray diffraction, and scanning electron microscopy/energy dispersive analysis of X-rays were used for microstructural characterization. Powder metallurgy base materials, AISI 430L and 316L, showed a single lamellar constituent after sintering in nitrogen. A mixed constituent was identified in PM duplex SS sintered in nitrogen and in vacuum. However, coarse and fine lamellar constituents were only present in PM duplex SS sintered in nitrogen. The effects of annealing solution heat treatment (1150 °C) on microstructures were evaluated. Homogeneous structures were obtained for the PM base materials, while for PM duplex SS, annealing dissolved lamellar constituents but mixed constituent were still present.

Keywords

Ferrite Austenite Powder Metallurgy Duplex Stainless Steel Fe3N 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors thank Junta de Castilla y León (Programa de Apoyo a Proyectos de Investigación a Iniciar en 2005, Orden EDU/1143/2004 de 6 de julio de 2004, B.O.C. y L. de 15 de julio de 2004, Ref. VA034A05) for financial support.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2009

Authors and Affiliations

  • C. García
    • 1
  • F. Martin
    • 1
    Email author
  • Y. Blanco
    • 1
  • M.P. de Tiedra
    • 1
  • M.L. Aparicio
    • 1
  1. 1.Materials EngineeringE.T.S.I.I., Universidad de ValladolidValladolidSpain

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