Comments on Small-angle neutron scattering analysis of the precipitation behaviour in a maraging steel by Staron, Jamnig, Leitner, Ebner & Clemens (2003)

Further to the paper by Staron, Jamnig, Leitner, Ebner & Clemens [ J. Appl. Cryst. ( 2003), 36, 415 - 419], the following points are made. Characterization of the precipitation process in maraging steels is difficult, primarily because the precipitates formed are on the nanometre scale. Identification of the precipitate type is complicated by the fact that its composition evolves during ageing, even when the precipitate type remains unchanged. Interpretation of experimental results should be treated with caution, especially when indirect methods, such as small-angle neutron scattering ( SANS), are used. Atom-probe field ion microscopy (APFIM) has proved to be capable of determining the type and composition of the fine precipitates in maraging steels. The advantages and disadvantages of SANS and APFIM are briefly discussed.