Effect of preexisting plastic deformation on the creep behavior of TP347 austenitic steel

Sung Min Hong, Dong Joon Min, Yong keun Chung, Ju Heon Kim, Dong Ik Kim, Jin Yoo Suh, Jae Hyeok Shim, Woo Sang Jung, In Suk Choi

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Abstract

We investigated the effect of preexisting plastic deformation with the strain of 30% on the creep behavior of TP347 austenitic steel at 650. °C with different applied stresses. The results showed that the creep rupture life of the prestrained sample increased more than that of the unstrained sample tested at 300, 250 and 200. MPa due to the strengthening of the mechanical twins induced by preexisting plastic deformation. Conversely, the prestrained samples were ruptured earlier than that of the unstrained sample tested when the lower creep stresses (150 and 125. MPa) were applied. The shorter creep rupture life of the prestrained sample was due to the reduced amount of time to a minimum creep rate and the shorter tertiary-stage creep time which can be related to the accelerated precipitation of sigma phase at the grain boundaries in the strained sample.

Original languageEnglish
Pages (from-to)390-399
Number of pages10
JournalMaterials Science and Engineering A
Volume654
DOIs
Publication statusPublished - 2016 Jan 27

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Hong, S. M., Min, D. J., Chung, Y. K., Kim, J. H., Kim, D. I., Suh, J. Y., Shim, J. H., Jung, W. S., & Choi, I. S. (2016). Effect of preexisting plastic deformation on the creep behavior of TP347 austenitic steel. Materials Science and Engineering A, 654, 390-399. https://doi.org/10.1016/j.msea.2015.12.051