Weldability and weld performance of candidate nickel base superalloys for advanced ultrasupercritical fossil power plants part I: fundamentals

David, Stan A.; Siefert, J. A.; DuPont, J. N.; Shingledecker, J. P.

doi:10.1179/1362171815Y.0000000035

Weldability and weld performance of candidate nickel base superalloys for advanced ultrasupercritical fossil power plants part I: fundamentals

Journal Article · Wed May 13 04:00:00 EDT 2015 · Science and Technology of Welding and Joining

DOI:https://doi.org/10.1179/1362171815Y.0000000035· OSTI ID:1360036

David, Stan A. ^[1]; Siefert, J. A. ^[2]; DuPont, J. N. ^[3]; Shingledecker, J. P. ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Electric Power Research Inst. (EPRI), Charlotte, NC (United States)
Lehigh Univ., Bethlehem, PA (United States)

Fossil fuel will continue to be the major source of energy for the foreseeable future. To meet the demand for clean and affordable energy, an increase in the operating efficiency of fossil fired power plants is necessary. There are several initiatives worldwide to achieve efficiencies >45% higher heating value (HHV) through an increase in steam temperature (700 to 760 degrees C) and pressure (27.6 to 34.5 MPa). Realising this goal requires materials with excellent creep rupture properties and corrosion resistance at elevated temperatures. In order to accomplish this, three classes of materials have been identified: creep strength enhanced ferritic steels, austenitic stainless steels and nickel base superalloys. Although new alloys have been designed and developed to meet this need, welding can have a significant and often detrimental effect on the required mechanical and corrosion resistant properties. Two previous papers addressed the welding and weldability of ferritic and austenitic stainless steels. Welding and weldability of nickel base alloys will be discussed in a two part paper. In this paper, the primary focus will be on the fundamentals of welding and weldability of Ni base superalloys.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1360036

Journal Information:: Science and Technology of Welding and Joining, Journal Name: Science and Technology of Welding and Joining Journal Issue: 7 Vol. 20; ISSN 1362-1718

Publisher:: Taylor & Francis

Country of Publication:: United States

Language:: English

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Weldability and weld performance of candidate nickel base superalloys for advanced ultrasupercritical fossil power plants part I: fundamentals

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