skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Journal Article · · Science and Technology of Welding and Joining
 [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)

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, Vol. 20, Issue 7; ISSN 1362-1718
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English

References (53)

The effects of ruthenium on the phase stability of fourth generation Ni-base single crystal superalloys journal May 2006
Prestraining effect on creep behaviour of nickel base C263 superalloy journal August 2002
Design of a creep resistant nickel base superalloy for power plant applications: Part 1 - Mechanical properties modelling journal March 2003
Welding and weldability of candidate ferritic alloys for future advanced ultrasupercritical fossil power plants journal November 2013
Strengthening Mechanisms in Polycrystalline Multimodal Nickel-Base Superalloys journal May 2009
Theory of microstructural development during rapid solidification journal May 1986
Effects of Long-Term Thermal Exposure on the Microstructure and Properties of a Cast Ni-Base Superalloy journal November 2007
Characterization of the microstructure evolution in a nickel base superalloy during continuous cooling conditions journal December 2001
Nucleation ahead of the advancing interface in directional solidification journal June 1997
Welding of nickel base superalloy single crystals journal April 1997
Dislocation movement through random arrays of obstacles journal October 1966
Nickel Base Superalloys for Next Generation Coal Fired AUSC Power Plants journal January 2013
Microstructural development in PWA-1480 electron beam welds — an atom probe field ion microscopy study journal March 1996
Design of a creep resistant nickel base superalloy for power plant applications: Part 2 - Phase diagram and segregation simulation journal March 2003
Welding Metallurgy and Weldability of Nickel-Base Alloys book September 2009
In situ neutron diffraction measurements of temperature and stresses during friction stir welding of 6061-T6 aluminium alloy journal May 2007
Microstructure of stainless steel single-crystal electron beam welds journal June 1990
Development of microstructures in Fe−15Ni−15Cr single crystal electron beam welds journal June 1989
INCONEL 718: A solidification diagram journal October 1989
A New Complex Phase in a High-Temperature Alloy journal July 1956
The welding metallurgy of HASTELLOY alloys C-4, C-22, and C-276 journal November 1986
Weld cracking in Ta-modified cast Inconel 718 journal January 1988
Correlation between solidification parameters and weld microstructures journal January 1989
Solidification and welding metallurgy of Thermo-Span alloy journal October 1997
Elastic interaction energy of two spherical precipitates in an anisotropic matrix journal August 1979
Homogenization and Dissolution Kinetics of Fusion Welds in INCONEL® Alloy 740H® journal March 2014
Solidification of Nb-bearing superalloys: Part II. Pseudoternary solidification surfaces journal November 1998
Coarsening kinetics of coherent γ′ precipitates in ternary Ni–based alloys: the Ni–Al–Si system journal January 2000
Interfacial free energies and solute diffusivities from data on Ostwald ripening journal January 1995
Effect of filler alloy composition on post-weld heat treatment cracking in GTA welded cast Inconel 738LC superalloy journal May 2008
Modelling of residual stresses and property distributions in friction stir welds of aluminium alloy 6061-T6 journal May 2007
U.S. Program on Materials Technology for Ultra-Supercritical Coal Power Plants journal June 2005
The effects of elastic stress on the kinetics of ostwald ripening: The two-particle problem journal July 1989
Theoretical analysis of strain-induced shape changes in cubic precipitates during coarsening journal June 1988
Elasticity effects on the microstructure of alloys containing coherent precipitates journal January 1996
Microstructural shape evolution of γ′ in nickel-based superalloys by stress-assisted diffusion journal February 2001
A melting and solidification study of alloy 625 journal September 1988
Effect of boron on grain-boundaries in Ni3Al† journal February 1985
Nickel-Based Superalloys for Advanced Turbine Engines: Chemistry, Microstructure and Properties journal March 2006
Modification of Ni-Cr-Co-Mo-Nb-Ti-Al Superalloy for USC Power Plant Application at Temperature above 750°C journal October 2007
The use of new PHACOMP in understanding the solidification microstructure of nickel base alloy weld metal journal December 1986
Microsegregation-related pitting corrosion characteristics of AL-6XN superaustenitic stainless steel laser welds journal October 2010
Introduction to the High-Temperature Oxidation of Metals book January 2006
Solidification Structures and Properties of Fusion Welds journal January 1975
Formation and stability of radiation-induced phases in neutron-irradiated austenitic and ferritic steels journal December 1989
A combined solubility product/new PHACOMP approach for estimating temperatures of secondary solidification reactions in superalloy weld metals containing Nb and C journal May 1998
Microstructure and phase stability in INCONEL alloy 740 during creep journal September 2004
The Role of Eta Phase Formation on the Creep Strength and Ductility of INCONEL Alloy 740 at 1023 K (750 °C) journal January 2012
The development of columnar grain and single crystal high temperature materials through directional solidification journal October 1970
High temperature behavior of Ni-base weld metal journal August 2004
Microstructural stability and mechanical properties of a new nickel-based superalloy journal August 2003
A comparison of the solidification behavior of INCOLOY 909 and INCONEL 718 journal January 1990
High temperature behavior of Ni-base weld metal journal August 2004