Specimen Size Effect on the Creep of Si3N4

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The effect of specimen size on the measured tensile creep behavior of a commercially available gas pressure sintered Si3N4 was examined. Button-head tensile test specimens were used for the testing, and were machined to a variety of different gage section diameters (ranging from 2.5 to 6.35 mm) or different surface-area-to-volume ratios. The specimens were then creep tested at 1350 Degrees C and 200 MPa with tensile creep strain continuously measured as a function of time. The steady-state creep rate increased and the lifetime decreased with an increase in diameter (or decrease in the ratio of gage section surface area to ... continued below

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10 p.

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Barnes, A.S.; Ferber, M.K.; Kirkland, T.P. & Wereszczak, A.A. January 25, 1999.

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Description

The effect of specimen size on the measured tensile creep behavior of a commercially available gas pressure sintered Si3N4 was examined. Button-head tensile test specimens were used for the testing, and were machined to a variety of different gage section diameters (ranging from 2.5 to 6.35 mm) or different surface-area-to-volume ratios. The specimens were then creep tested at 1350 Degrees C and 200 MPa with tensile creep strain continuously measured as a function of time. The steady-state creep rate increased and the lifetime decreased with an increase in diameter (or decrease in the ratio of gage section surface area to volume). The time and specimen size dependence of transformation of a secondary phase correlated with the observed creep rate and lifetime dependence.

Physical Description

10 p.

Notes

OSTI as DE00004595

Medium: P; Size: 10 pages

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  • 23rd Annual Cocoa Beach Conference and Exposition, Cocoa Beach, FL (US), 01/25/1999--01/29/1999

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  • Report No.: ORNL/CP-102057
  • Report No.: ED 19 01 00 0
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 4595
  • Archival Resource Key: ark:/67531/metadc675553

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Office of Scientific & Technical Information Technical Reports

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Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 25, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • April 6, 2017, 7:06 p.m.

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Barnes, A.S.; Ferber, M.K.; Kirkland, T.P. & Wereszczak, A.A. Specimen Size Effect on the Creep of Si3N4, article, January 25, 1999; Tennessee. (digital.library.unt.edu/ark:/67531/metadc675553/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.