A comparison of three weld consumables for P92 under creep

D. W. J. Tanner*, K. Chalk, W. Sun, P. H. Shipway, T. H. Hyde

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

1 Citation (Scopus)

Abstract

To encourage realistic power plant weld heat-affected zone failures within reasonable test times in laboratory creep testing, a welding consumable for P92 steel with the best creep performance was sought, to avoid failures in the weld metal itself. Therefore, a short term creep test programme was undertaken to evaluate weld pads manufactured using three commercially available consumables for P92, the results of which are presented in this paper. The effects of weld consumable composition are discussed both in general and with specific reference to the behaviour observed. The best overall and the poorest performing weld consumables were identified by composition. Microstructural investigations revealed the presence of precipitate free zones, that more readily formed using the poorest performing consumable as the result of retained 6 ferrite, since its deposited chemical composition led to the lowest value of 6 ferrite formation temperature. A consumable not based on P92 but on the stronger steel alloy FB2 did not perform as well as expected, confirming previous suggestions that the compositional factors which make a parent material creep-strong do not apply on a one-to-one basis to weld metals.

Original languageEnglish
Pages (from-to)359-367
Number of pages9
JournalMaterials at High Temperatures
Volume29
Issue number4
DOIs
Publication statusPublished - 2012

Keywords

  • DESIGN
  • P92 weld consumable
  • precipitate free zone
  • 9CR STEEL
  • METALS
  • LAVES PHASE
  • microstructure
  • POWER-PLANTS
  • PRECIPITATION
  • filler metal
  • delta ferrite
  • creep
  • 9-12-PERCENT CR STEELS
  • CARBONITRIDES
  • composition difference
  • MICROSTRUCTURE
  • TEMPERATURE

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