Small-angle neutron scattering and the Mössbauer effect in nitrogen austenite

Small-angle neutron scattering (SANS) in Fe-19%Cr-19%Mn-0.9%N and Fe-18%Cr-10%Mn-16%Ni-0.5%N (wt %) high-nitrogen austenites is investigated. The neutron diffraction patterns and Mössbauer spectra are measured and analyzed. The SANS curves are approximated in the framework of the Guinier and Porod models. The nature of small-angle neutron scattering in nitrogen austenite is explained in terms of microinhomogeneities whose structure depends on the alloying with nickel. The mean size and shape of inhomogeneities are evaluated. The effect of low-temperature annealing of the Fe-19%Cr-19%Mn-0.9%N austenite on small-angle neutron scattering and the parameters of the Mössbauer spectra is analyzed.