The diagnostics of Structure and physical-mechanical properties of high-strength clad constructional steels

Putilova, Evgeniia; The Institute of Engineering Science, UB RAS; Russian Federation

Putilova, E.A.; The Institute of Engineering Science UB RAS; Russia
Zadvorkin, S.M.; Institute of Engineering Science UB of RAS; Russia
Gorkunov, E.S.; Institute of Engineering Science UB of RAS; Russia

ID: ECNDT-0098-2018
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Session: Materials Characterization - Magnetic Techniques 2
Room: J2
Date: 2018-06-14
Time: 15:40 - 16:00

The development of the Arctic regions and the implementation of large-scale projects in the northern latitudes are closely connected with the necessity to create and introduce new technologies and especially promising materials that are resistant to aggressive external influences and could ensure the durability, reliability and economy of the applicable structures.
In this work, we studied the structure, phase composition, mechanical and magnetic properties of structural steel used for hulls of ice navigation vessels clad with corrosion-resistant steels with varying degrees of austenite stability in order to determine the possibility of using magnetic methods for diagnostics the current state of such materials. Since corrosive wear affects only the outer surface of the hull, it is economically feasible to increase the corrosion resistance not over the entire thickness of the hull, but to provide it in a thin clad surface layer made of corrosion-resistant steel. And it is necessary to diagnose changes occurring during operational loads in both the laminate as a whole and in the components that make it up. At present, there are no adequate methods of nondestructive testing of the current state of individual layers in bimetallic materials under operating stress conditions.
It is proposed to use the values of the maximums on the field dependences of the differential magnetic permeability as parameters for diagnostics the formation of a new magnetically ordered phase and its amount formed in the process of plastic and elastoplastic deformation. It is shown that the coercive force and the maximum magnetic permeability could be used as parameters of nondestructive testing to assess the quality of such heat treatment operations as quenching and tempering of the researched materials.