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

Abstract

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.

Authors:
 [1];  [2];  [3];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Electric Power Research Inst. (EPRI), Charlotte, NC (United States)
  3. Lehigh Univ., Bethlehem, PA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1360036
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Science and Technology of Welding and Joining
Additional Journal Information:
Journal Volume: 20; Journal Issue: 7; Journal ID: ISSN 1362-1718
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Austenitic steels; Advanced ultrasupercritical; Phase stability; Corrosion; Weldability; HEAT-AFFECTED-ZONE; NB-BEARING SUPERALLOYS; AGE CRACKING CHARACTERISTICS; HIGH-TEMPERATURE BEHAVIOR; ELECTRON-BEAM WELDS; MICROSTRUCTURAL DEVELOPMENT; DIRECTIONAL SOLI

Citation Formats

David, Stan A., Siefert, J. A., DuPont, J. N., and Shingledecker, J. P. Weldability and weld performance of candidate nickel base superalloys for advanced ultrasupercritical fossil power plants part I: fundamentals. United States: N. p., 2015. Web. doi:10.1179/1362171815Y.0000000035.
David, Stan A., Siefert, J. A., DuPont, J. N., & Shingledecker, J. P. Weldability and weld performance of candidate nickel base superalloys for advanced ultrasupercritical fossil power plants part I: fundamentals. United States. doi:10.1179/1362171815Y.0000000035.
David, Stan A., Siefert, J. A., DuPont, J. N., and Shingledecker, J. P. Wed . "Weldability and weld performance of candidate nickel base superalloys for advanced ultrasupercritical fossil power plants part I: fundamentals". United States. doi:10.1179/1362171815Y.0000000035.
@article{osti_1360036,
title = {Weldability and weld performance of candidate nickel base superalloys for advanced ultrasupercritical fossil power plants part I: fundamentals},
author = {David, Stan A. and Siefert, J. A. and DuPont, J. N. and Shingledecker, J. P.},
abstractNote = {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.},
doi = {10.1179/1362171815Y.0000000035},
journal = {Science and Technology of Welding and Joining},
issn = {1362-1718},
number = 7,
volume = 20,
place = {United States},
year = {2015},
month = {5}
}

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