Single-crystal elastic constants of Fe-15Ni-15Cr alloy

Abstract

Resonant ultrasound spectroscopy (RUS) and pulse-echo (PE) superposition techniques have been used to determine the three independent elastic-stiffness constants C 11 , C 12 , and C 44 as a function of temperature for single crystals of 70Fe-15Ni-15Cr alloy. The values of the elastic moduli determined using RUS and PE are in very good agreement within the range of uncertainties. This particular ternary composition of Fe, Ni, and Cr undergoes an fcc-bcc structural phase transformation near 190 K resulting in a low-temperature ferromagnetic phase. The Debye characteristic temperature was determined to be 447 K from PE and 451 K from RUS measurements. The Zener elastic anisotropy A ϭ 2C 44 /(C 11 Ϫ C 12 ) is nearly constant: A ϭ 3.53 Ϯ 0.16 in Fe-Ni-Cr alloys with similar compositions. For these alloys, only small variations are observed in the Grüneisen parameter, ␥ Ϸ 2.08, and in the Poisson ratio, v [hkl] ϭ 0.293 Ϯ 0.013.

Influence of the microstructure and voids on the high‐cycle fatigue strength of 316L stainless steel under multiaxial loading

“…An isotropic elastic model is used to define the behaviour of the matrix. The isotropic elastic moduli ( Table 2) are determined with a tensile test, whereas those used in the cubic elastic model (Table 4) have been identified by Teklu et al for an austenitic steel, 27 close to the one studied in the present work.…”

Stacking fault energies in austenitic stainless steels

“…[27] where alloys with very similar concentrations were measured. In the cases where the exact alloy concentrations could not be found, we used data from the closest available alloy.…”

Alloy Steel: Properties and Use First-Principles Quantum Mechanical Approach to Stainless Steel Alloys

“…We have demonstrated the above effect in the case of the temperature dependence of the single crystal elastic constants of paramagnetic Fe-Cr-Ni alloys ). In particular, we have shown that spin fluctuation in paramagnetic Fe-Cr-Ni alloys can account for 63% of c'/T and 28% for c 44 /T as compared to the experimental measurements (Teklu et al, 2004).…”