Evaluation of T91 after 130,000 hours in service

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Description

Two superheater tubes fabricated from T91 were removed for evaluation after 130,000 hours service. Regions of interest included a hot section that replaced type 321 stainless steel, dissimilar welds to type 321 stainless steel safe ends, and cold bends. The evaluation consisted of metallography, transmission electron microscopy (TEM) and precipitate analysis, hardness, tensile properties, creep, and stress rupture. Observed microstructure and properties of the tubing were compared with results on unexposed and thermally aged materials. Overall, the properties were similar to expectations. Substructural coarsening occurred which produced reductions in the short-time tensile and creep strength. However, ductility remained high. Corrosion ... continued below

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11 p.

Creation Information

Swindeman, R.W.; Sikka, V.K.; Maziasz, P.J. & Canonico, D.A. March 1, 1998.

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Description

Two superheater tubes fabricated from T91 were removed for evaluation after 130,000 hours service. Regions of interest included a hot section that replaced type 321 stainless steel, dissimilar welds to type 321 stainless steel safe ends, and cold bends. The evaluation consisted of metallography, transmission electron microscopy (TEM) and precipitate analysis, hardness, tensile properties, creep, and stress rupture. Observed microstructure and properties of the tubing were compared with results on unexposed and thermally aged materials. Overall, the properties were similar to expectations. Substructural coarsening occurred which produced reductions in the short-time tensile and creep strength. However, ductility remained high. Corrosion was minimal, although somewhat greater on the fire side of the cold bend. Short oxide wedge cracks were observed at the dissimilar metal welds, and type 4 cracking was observed in an untempered region of a stainless steel attachment weld.

Physical Description

11 p.

Notes

OSTI as DE98004944

Source

  • 1998 ASME/JSME joint pressure vessel and piping (PVP) conference, San Diego, CA (United States), 26-30 Jul 1998

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  • Other: DE98004944
  • Report No.: ORNL/CP--97476
  • Report No.: CONF-980708--
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/654008 | External Link
  • Office of Scientific & Technical Information Report Number: 654008
  • Archival Resource Key: ark:/67531/metadc712316

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Jan. 25, 2016, 12:22 p.m.

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Swindeman, R.W.; Sikka, V.K.; Maziasz, P.J. & Canonico, D.A. Evaluation of T91 after 130,000 hours in service, report, March 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc712316/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.