New design aspects of creep-resistant NiAl-strengthened ferritic alloys

Abstract Ferritic alloys strengthened with NiAl precipitates are being developed for elevated-temperature applications. Due to the high concentration of Al in these alloys, they feature a relatively low density of ∼7 g cm −3 . In this paper, the high-temperature mechanical behavior of NiAl-strengthened ferritic alloys is reviewed. Further, we discuss another related class of alloys, where the precipitate strengthening is provided by Ni 2 TiAl-type precipitates rather than NiAl. These relatively unexplored alloys may enhance the creep resistance of precipitate-strengthened ferritic alloys.

[1]  Joseph K. L. Lai,et al.  Creep behavior of a β′(NiAl) precipitation strengthened ferritic Fe–Cr–Ni–Al alloy , 1998 .

[2]  G. Sauthoff,et al.  Ferritic Fe–Al–Ni–Cr alloys with coherent precipitates for high-temperature applications , 2004 .

[3]  Eckhard Nembach,et al.  Particle Strengthening of Metals and Alloys , 1996 .

[4]  P. Strutt,et al.  High temperature creep in a semi-coherent NiAl-Ni2AlTi alloy , 1976 .

[5]  P. Strutt,et al.  Creep behavior of the heusler type structure alloy Ni2AlTi , 1976 .

[6]  R. Reed.  The Superalloys: Fundamentals and Applications , 2006 .

[7]  D. Miracle.  Overview No. 104 The physical and mechanical properties of NiAl , 1993 .

[8]  Michael K Miller,et al.  Characterization of nanoscale NiAl-type precipitates in a ferritic steel by electron microscopy and atom probe tomography , 2010 .

[9]  R. Viswanathan,et al.  Materials for ultra-supercritical coal-fired power plant boilers , 2006 .

[10]  R. McMeeking,et al.  The effect of interface diffusion and slip on the creep resistance of particulate composite materials , 1994 .

[11]  A. Evans,et al.  The effects of diffusional relaxation on the creep strength of composites , 1991 .

[12]  M. Mclean,et al.  On the threshold stress for dislocation creep in particle strengthened alloys , 1985 .

[13]  Gerhard Sauthoff,et al.  The strengthening effect of (Ni, Fe)Al precipitates on the mechanical properties at high temperatures of ferritic Fe–Al–Ni–Cr alloys , 2005 .

[14]  Peter K. Liaw,et al.  Effects of Al on the microstructure and ductility of NiAl-strengthened ferritic steels at room temperature , 2010 .

[15]  J. Shingledecker,et al.  U.S. program on materials technology for ultra-supercritical coal power plants , 2005 .

[16]  Bjørn Clausen,et al.  Neutron-diffraction study and modeling of the lattice parameters of a NiAl-precipitate-strengthened Fe-based alloy , 2012 .

[17]  M. Fine,et al.  Coarsening kinetics of coherent NiAl-type precipitates in FeNiAl and FeNiAlMo alloys , 1984 .

[18]  Fan Zhang,et al.  New NiAl-strengthened ferritic steels with balanced creep resistance and ductility designed by coupling thermodynamic calculations with focused experiments , 2012 .

[19]  G. Sauthoff,et al.  Deformation behaviour of iron-rich iron-aluminum alloys at low temperatures , 2003 .

[20]  H. K. D. H. Bhadeshia,et al.  Design of Ferritic Creep-resistant Steels , 2001 .

[21]  Mark Asta,et al.  Calculation of impurity diffusivities in α-Fe using first-principles methods , 2010 .

[22]  E. Kenik,et al.  Room temperature ductility of NiAl-strengthened ferritic steels: Effects of precipitate microstructure , 2012 .

[23]  P. Withers,et al.  An investigation of the isothermal creep response of Al-based composites by neutron diffraction , 2000 .

[24]  R. Darolia,et al.  NiAl alloys for high-temperature structural applications , 1991 .

[25]  Mark Asta,et al.  A computational study of impurity diffusivities for 5d transition metal solutes in α-Fe , 2012 .

[26]  M. E. Kassner.  Fundamentals of Creep in Metals and Alloys , 2004 .

[27]  W. Nix,et al.  High temperature creep of Ni-20Cr-2ThO2 single crystals , 1976 .

[28]  V. Radmilović,et al.  On the formation of hierarchically structured L21-Ni2TiAl type precipitates in a ferritic alloy , 2013, Journal of Materials Science.

[29]  Yanfei Gao,et al.  In Situ Neutron-Diffraction Studies on the Creep Behavior of a Ferritic Superalloy , 2011, Metallurgical and Materials Transactions A.

[30]  Oliver Kraft,et al.  Interface controlled plasticity in metals: dispersion hardening and thin film deformation , 2001 .

[31]  Xi Wang,et al.  The creep rate induced by interface diffusion in particulate composite materials , 2011 .