Tensile, creep and microstructural behavior of welded cast Haynes 282 alloy for A-USC steam turbine casing applications

P. J. Maziasz, J. Moser, K. Unocic, Y. Yang, D. Purdy, P. D. Jablonski

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

Haynes 282 alloy is a relatively new Ni-based superalloy that is being considered for advanced ultrasupercritical (A-USC) steam turbine casings for steam temperatures up to 760°C. Weld properties are important for the turbine casing application, so block ingots of Haynes 282 alloy were cast for properties studies. Good, sound welds were produced using Haynes 282 weld-wire and a hot gas-tungsten-arc welding method, and tensile and creep-rupture properties were measured on cross-weld specimens. In the fully heat-treated condition (solution annealed + aged), the tensile properties of the welded specimens compare well with as-cast material. In the fully heat-treated condition the creep-rupture life and ductility at 750°C/250MPa and 800°C/200MPa of the cross-weld specimens are similar to the as-cast base metal, and repeat creep tests show even longer rupture life for the welds. However, without heat-treatment or with only the precipitate age-hardening heat-treatment, the welds have only about half the rupture life and much lower creep ductility than the as-cast base metal. These good properties of weldments are positive results for advancing the use of cast Haynes 282 alloy for the A-USC steam turbine casing application.

Original languageEnglish
Title of host publicationAdvances in Materials Technology for Fossil Power Plants - Proceedings from the 8th International Conference
EditorsJohn Shingledecker, J. Siefert, Jonathan Parker
PublisherASM International
Pages702-713
Number of pages12
ISBN (Electronic)1627081313, 9781627081313
StatePublished - 2016
Event8th International Conference on Advances in Materials Technology for Fossil Power Plants - Albufeira, Algarve, Portugal
Duration: Oct 11 2016Oct 14 2016

Publication series

NameAdvances in Materials Technology for Fossil Power Plants - Proceedings from the 8th International Conference

Conference

Conference8th International Conference on Advances in Materials Technology for Fossil Power Plants
Country/TerritoryPortugal
CityAlbufeira, Algarve
Period10/11/1610/14/16

Keywords

  • Cast superalloy
  • Creep-rupture properties
  • Heat-treatment effects
  • Microstructural analysis
  • Pandat computational thermodynamics
  • Tensile properties
  • Welded superalloy

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