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Autori: Petculescu P., Zagan R. Petculescu A
Editorial: 153rd Meeting: Acoustical Society of America, Journal of Acoustical Society of America, Vol. 121, No. 5, 2007.
Cryogenic steels are needed in the construction of industrial installations able to withstand low temperatures. This poster presents results on the use of an ultrasonic resonant technique to determine the composition of the cryogenic stainless steel 10TiNiCr180 with an austenitic structure.
The investigations were done both in the base material and in the weld,
with and without thermal treatment. Upon exposing the sample to two
thermal treatments welding-hardening and welding-hardening-annealing,
metallographic analysis showed the presence of chromium carbide in the
base material and the weld. The ultrasonic power spectrum shows a prevalent austenitic structure in the base material and a compound austeniteferrite-chromium carbide structure in the weld. The grain size determined from the spectral peak ratio is compared with the one obtained by metallographic analysis. The measurements presented here were obtained in direct contact with the pulse-echo technique, with excitation centered at 5MHz.
Cuvinte cheie: materiale, fizica // materials, physics