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Microstructure and Creep Properties of AISI 316LN Steels with Niobium Additions

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Abstract:

The long-term creep rupture tests have been carried out on three casts of a type AISI 316LN steel at 600 and 650°C. Two of the casts investigated contained additions of 0.1 and 0.3 wt.% of niobium. The growing niobium content strongly reduced the minimum creep rate and prolonged the time to the onset of the tertiary stage of creep and also shortened this stage. The enhanced creep resistance of niobium containing steels is not accompanied by the longer creep life that might have been expected. At both temperatures of creep exposure the niobium-bearing casts displayed an inferior creep ductility. Microstructural investigations revealed that niobium provoked significant grain size refinement and the formation of Z-phase. Particles of this phase were considerably dimensionally stable. Furthermore, niobium accelerated the formation and coarsening of s-phase, h-Laves and M6(C,N). The coarse intergranular particles facilitated the formation of cavities which resulted in intergranular failure mode.

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Periodical:

Materials Science Forum (Volume 482)

Pages:

275-278

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.482.275

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Online since:

April 2005

Authors:

Vlastimil Vodárek, Gabriela Rožnovská, Jaromír Sobotka

Keywords:

Austenitic Steel, Creep Failure Mechanisms, Creep Rupture Tests, Precipitation Reactions

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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