R. A. Savrai, A. V. Makarov, I. Yu. Malygina, S. A. Rogovaya, A. L. Osintseva

IMPROVING THE STRENGTH OF THE AISI 321 AUSTENITIC STAINLESS STEEL BY FRICTIONAL TREATMENT

The influence of frictional treatment on the micromechanical characteristics, phase composition, residual stresses, surface roughness and damage of the AISI 321 austenitic stainless steel is investigated. The frictional treatment is performed with a hemispherical synthetic diamond indenter, loaded with 294 N, in a non-oxidizing argon medium, by varying the number of indenter strokes over the same part of the surface. It has been established that, to achieve substantial hardening, high quality and sufficient contact strength of the steel surface, it is expedient that, with the used process parameters, the frictional treatment of the AISI 321 steel be carried out with the number of double strokes not exceeding 14. Herewith, frictional treatment with 14 double strokes increases microhardness by a factor of 3.7, up to 730 HV0.025, while providing low surface roughness with Ra = 0.23 mm and highly increased ability of the surface to resist mechanical contact, this being supported by the data of kinetic microindentation.

Acknowledgment: This work was done within the Complex program of UB RAS, project no. 15-10-1-22, within the state order of FASO Russia on the subject “Structure” no. 01201463331 and with partial financial support of the Russian Foundation for Basic Research grant no. 15-08-06754_a. Electron scanning microscopy, optical profilometry and micromechanical tests were performed in Collective Use Center “Plastometriya” of the Institute of Engineering Science UB RAS.

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