A Microstructural Sensitivity Study of 316H Austenitic Stainless Steel to Inter-Granular Creep Fracture

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A preliminary sensitivity examination of the ductility exhaustion based creep damage prediction model, currently used in the R5 high temperature assessment procedure, showed that material property inputs had significant effects on damage prediction. In the present work, the link between the microstructural factors and the susceptibility to inter-granular high temperature creep failure is considered. The latter was judged to be associated with the low creep ductility. Here, the longitudinal section of a creep specimen and the fracture surface were examined. Auger electron spectroscopy was used to investigate the grain boundary composition in this specimen, which failed after a creep test of 1038h at 550°C under a triaxial stress state. The present results demonstrate that there is a possibility to correlate the susceptibility to high temperature inter-granular fracture from the low temperature fracture investigations. Finally, the susceptibility of the pre-treated 316H stainless steel to inter-granular high temperature failure and the contribution to the creep damage model are briefly discussed.

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Periodical:

Key Engineering Materials (Volumes 488-489)

Edited by:

Z. Tonkovic and Prof. Ferri M.H.Aliabadi

Pages:

658-661

Citation:

B. Chen et al., "A Microstructural Sensitivity Study of 316H Austenitic Stainless Steel to Inter-Granular Creep Fracture", Key Engineering Materials, Vols. 488-489, pp. 658-661, 2012

Online since:

September 2011

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$41.00

[1] B. Chen, P.E.J. Flewitt, and D.J. Smith: Mater. Sci. Eng. A Vol. 527 (2010), p.7387.

[2] B. Chen, D.J. Smith, P.E.J. Flewitt, and M.W. Spindler, Effects of multiaxial stress state and microstructure on creep properties of austenitic stainless steel, Int. Conf. on Eng. Struct. Integrity Assessment, Manchester, UK (2011).

[3] G.A. Webster, S.R. Holdsworth, M.S. Loveday, K. Nikbin, I.J. Perrin, and H. Purper: Fatigue Fract. Eng. Mater. Struct. Vol. 27 (2004), p.319.

[4] B. Chen, Effects of Thermo-Mechanical History on Creep Damage in 316H Austenitic Stainless Steel, PhD thesis, University of Bristol (2011).

[5] British Energy Ltd., R66, AGR materials data handbook, Issue 5 (1999).

[6] C.L. White, J.H. Schneibel, and M.H. Yoo, Report: sulfur and antimony segregation to creep cavity surfaces in Ni and an FCC Fe-Ni-Cr alloy, Information Bridge: DOE Scientific and Technical Information.

[7] C.J. McMahon, and V. Vitek: Acta Mater. Vol. 27 (1979), p.507.