Creep cavities and carbide evolution in interrupted creep conditions along P91 steel of dissimilar weld joint

Tushar Ramdas Dandekar, Deepshree Awale, Atul Ballal , Manjusha Thawre

Research output: Contribution to journalArticlepeer-review

Abstract

The creep behaviour of dissimilar weld joint of 316LN SS-P91 steel when subjected to lower applied stresses (below 100MPa) generally fails in a Type-IV pattern. The dissimilar weld joint was welded through shielded metal arc welding (SMAW) process with INCONEL as electrode, a nickel-based superalloy. An interrupted creep test was carried out at creep condition of 80 MPa -600 ℃ temperature. Interruption was done at two stages of creep i.e. (a) mid of secondary and (b) start of tertiary. Microstructural evolution with respect to the hardness variation along various regions of P91 steel at interrupted and the failed specimen was done. A coarsening of hierarchical boundaries and M 23 C 6 carbides was observed along HAZ region that has resulted with respect to time and temperature.
Original languageEnglish
JournalJournal of Adhesion Science and Technology
Publication statusAccepted for publication - 13 Jun 2024

Keywords

  • P91 steel
  • Dissimilar weld
  • Creep cavities
  • M23C6
  • Interrupted creep test

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