METHOD FOR DETERMINING HEAT RESISTANCE OF AUSTENITE STEELS Russian patent published in 2017 - IPC G01N3/60 

FIELD: technological processes.

SUBSTANCE: method for determining the heat resistance of austenitic steels based on the maximum depth of its corrosion damage when testing a specified number of steel samples under conditions of a high-temperature aggressive medium includes the preparation of the site thin section of the largest sample corrosion damage and the measurement of the greatest depth of the said damage by an optical microscope. Herewith with the help of a ferritometer, several samples with the largest values of the ferrite phase content in the surface layer at the indicated places of the greatest corrosion damage are selected from the given total amount; the sections are manufactured and their examination is carried out by this microscope only for the number of samples selected in this way. The section surface of the samples selected for the study is polished with a silica-based suspension with an etching effect; after determining the heat resistance of the samples selected for the study by means of an optical microscope, in addition by the electron scanning microscope, the maximum thickness of the altered ferritic metal layer is measured in the samples selected for the study; the measurement results for each section are summed and the average proportionality coefficient between the maximum values of the corrosion damage depth and the thickness of the altered ferritic layer is calculated.

EFFECT: eliminating the need for laborious research using optical and scanning electronic devices of all samples identified for the study of heat resistance.

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