Effect of some thermomechanical variables on plastic flow and creep-rupture of type 304 stainless steel at 593/sup 0/C

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As part of an effort to examine sources of variability in the creep-rupture behavior of type 304 stainless steel, specimens subjected to a variety of prior thermomechanical treatments were tested. Included were different reannealing temperatures, cooling rates, types of prior straining, and a 24-hr age at 816/sup 0/C. Two product forms of a single heat (heat 9T2796) were involved, and most testing was at 593/sup 0/C. For material with coarse grain size, reannealing temperature had no pronounced influence. However, slow cooling rates and the 816/sup 0/C aging significantly extended the rupture life. On the other hand, cold working by an ... continued below

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Pages: 29

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Swindeman, R.W. January 1, 1977.

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Description

As part of an effort to examine sources of variability in the creep-rupture behavior of type 304 stainless steel, specimens subjected to a variety of prior thermomechanical treatments were tested. Included were different reannealing temperatures, cooling rates, types of prior straining, and a 24-hr age at 816/sup 0/C. Two product forms of a single heat (heat 9T2796) were involved, and most testing was at 593/sup 0/C. For material with coarse grain size, reannealing temperature had no pronounced influence. However, slow cooling rates and the 816/sup 0/C aging significantly extended the rupture life. On the other hand, cold working by an equivalent of 4% tensile strain had very little influence on rupture life. Slow cooling or aging increased rupture life as a result of greatly improved creep ductility. This finding is consistent with similar observations in the literature for this and other stainless steels, and is believed to be due to the development of coarse, beneficial carbides on grain boundaries before stressing. The creep response in the primary and secondary stages was influenced by nearly all the thermomechanical treatments, but the variability in the response at relatively high stresses was scarcely greater than the variability observed in multiple tests on specimens having a common thermomechanical history. 10 figures, 1 table.

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Pages: 29

Notes

Dep. NTIS, PC A03/MF A01.

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  • Winter annual meeting of the American Society of Mechanical Engineers, Atlanta, GA, USA, 27 Nov 1977

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  • Report No.: CONF-771120-15
  • Grant Number: W-7405-ENG-26
  • Office of Scientific & Technical Information Report Number: 5270024
  • Archival Resource Key: ark:/67531/metadc1071582

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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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  • January 1, 1977

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  • Feb. 4, 2018, 10:51 a.m.

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  • March 23, 2018, 6:18 p.m.

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Swindeman, R.W. Effect of some thermomechanical variables on plastic flow and creep-rupture of type 304 stainless steel at 593/sup 0/C, article, January 1, 1977; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1071582/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.