METHOD OF NON-DESTRUCTIVE ESTIMATION OF CRITICAL CHANGES OF METAL TECHNICAL STATE Russian patent published in 2015 - IPC G01N3/42 

FIELD: instrumentation.

SUBSTANCE: invention relates to the non-destructive tests, in particular to method of detection of critical changes of metal technical state due to ageing processes. Essence of the invention is as follows: surface is prepared, on the prepared surface the indentor acts, and metal microhardness is determined. Initially to the prepared surface of the metal specimen similar to metal of the studied structure but in initial state the indentor acts in different zones performing series of measurements in each zone. Distribution of the microhardness in each zone is determined, then minimum microhardness is determined, it is used as base minimum value for the given metal. Then similarly the microhardness is measured at the studied section of the studied structure of the same metal, based on the measurement results the microhardnesses distribution is determined, it is compared with the obtained base minimum microhardness. More lower values of the microhardness in metal of the studied structure as compared with the base minimum microhardness say about presence of the critical changes in metal of the studied zone of the structure due to the metal ageing.

EFFECT: increased efficiency of estimation and forecast of the structures operational reliability.

2 dwg