THE METHODS AND DEVICES OF THE NON-DESTRUCTIVE CONTROL OF QUALITY OF THE THERMAL PROCESSING AND SURFACE STRENGTHENING OF STEEL ITEMS

The work is aimed at studying the structural sensitivity of the magnetic characteristics of the hardened items of the different thickness, made from the carbonic steels to the carbon content deviations and to the variations of structure at tempering; at searching for the optimum parameters of control of the thermal and chemico-thermal processing; at the developing the methods and instruments of the non-destructive control and its introduction in the production. The essentially large dependence of the magnetic characteristics of the thermal-processed thin-sheet items from the carbon steels with the through hardening on the carbon content has been established at the comparison with "massive" items. The optimum depth of magnetizing of the items to be controlled and the more informative parameters of the cementing quality contorl have been determined. The methods and instruments of the thermal processing quality control of the thin-sheet items from carbon steels have been developed at the carbon content variation of about 0,2%. The two-parameter control of quality of cementation, using the coercitimetric and vortex methods, the local control of the HFC hardening control and the depth of the nitrated layers of the items from the carbon and austenite steels have been developed. The non-destructive methods of the quality control of the thermal processing and surface strengthening of items from the ferromagnetic and austenite steels have been introduced in practice of productionAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio