Characterization of nanoscale NiAl-type precipitates in a ferritic steel by electron microscopy and atom probe tomography

The microstructure of NiAl-type (β′) precipitates in an aged ferritic steel (Fe–12.7Al–9Ni–10.2Cr–1.9Mo, at.%) is characterized by transmission and analytical electron microscopy (AEM) and atom probe tomography (APT). The alloy shows a duplex precipitation of β′ particles: primary with an average diameter of 130 nm and secondary with an average diameter of 3 nm. Based on APT, the primary and secondary β′ have compositions of Ni41.2Al43.6Fe12.7Cr0.8Mo1.4 and Ni26.3Al41.6Fe26.9Cr3.3Mo1.7, respectively.

[1]  J. E. Doherty,et al.  Precipitation of γ in the γ′of nickel-base superalloys , 1974, Metallurgical and Materials Transactions B.

[2]  Z. Guo,et al.  Microstructural evolution in a PH13-8 stainless steel after ageing , 2003 .

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

[4]  R. Viswanathan,et al.  Materials for ultrasupercritical coal power plants—Boiler materials: Part 1 , 2001 .

[5]  M. Fine,et al.  Effect of cyclic plastic deformation on elevated temperature ostwald ripening of an alloy with coherent precipitates , 1984 .

[6]  G. B. Olson,et al.  Precipitation of heusler phase (Ni2TiAl) from B2-TiNi in Ni-Ti-Al and Ni-Ti-Al-X (X=Hf, Zr) alloys , 2003 .

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

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

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

[10]  G. B. Olson,et al.  Precipitation of paraequilibrium cementite: Experiments, and thermodynamic and kinetic modeling , 2002 .

[11]  David C. Joy,et al.  Principles of Analytical Electron Microscopy , 1986, Springer US.

[12]  W. C. Johnson,et al.  On the morphological development of second-phase particles in elastically-stressed solids , 1992 .

[13]  S. Tjong,et al.  Dislocation/particle interactions in β′(NiAl) precipitation strengthened ferritic Fe-19Cr-4Ni-2Al alloy , 1997 .

[14]  H. C. Vacher,et al.  Identification of metallurgical reactions and their effect on the mechanical properties of 17-7 PH stainless steel , 1962 .

[15]  K. Kakehi.  Effect of primary and secondary precipitates on creep strength of Ni-base superalloy single crystals , 2000 .

[16]  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 .

[17]  Gregory B Olson,et al.  Characterization of the microstructure and phase equilibria calculations for the powder metallurgy superalloy IN100 , 2003 .

[18]  T. Nishizawa,et al.  Miscibility gap in Fe-Ni-Al and Fe-Ni-Al-Co systems , 1984 .

[19]  Madeleine Durand-Charre,et al.  The microstructure of superalloys , 1997 .