R. A. Savrai, P. A. Skorynina, A. V. Makarov, L. Kh. Kogan, M. B. Rigmant, A. I. Men’shakov

THE EFFECT OF FRICTION PROCESSING AND LOW-TEMPERATURE PLASMA CARBURIZING ON THE MAGNETIC PROPERTIES OF THE AISI 321 AUSTENITIC STAINLESS STEEL

The paper investigates the magnetic properties of the AISI 321 corrosion-resistant austenitic steel subjected to electron beam plasma carburizing at temperatures of 350 and 500 °C, friction processing with a sliding indenter, and different kinds of combined processing including friction processing and plasma carburizing. It is found that plasma carburizing, friction processing, and combined processing of the AISI 321 steel are accompanied by a change in the magnetic parameters of the modified surface layers, which, in turn, is due to a change in the structural and phase state. Moreover, the AISI 321 steel exhibits the highest values of relative magnetic permeability μr and coercive force Hc after combined processing including friction processing and plasma carburizing at T = 350 °C, which ensures maximum surface hardness and the maximum possible depth of the modified surface layer. The obtained results indicate a high sensitivity of magnetic properties to changes in the structural and phase state of thin surface layers of the AISI 321 austenitic steel, and they can be used to develop magnetic techniques for testing the quality of surface hardening treatments (including combined ones) of austenitic chromium-nickel steels.

Acknowledgment: This study was performed under the state assignments for the IES UB RAS, reg. No. 124020600045-0, the IMP UB RAS, Nos. 122021000033-2 (Structure) and 122021000030-1 (Diagnostics), and the IEP UB RAS, No. 125020601664-1. The equipment of the Plastometriya shared research facilities at the IES UB RAS was used for the structural studies.

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