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After low-temperature ageing the subsurface zone of the effect of the formation became wider, reaching 15-30 [micro]m (in comparison with 10-15 [micro]m after first ageing).
As a result of the formation of the subsurface zone of the tensile residual stresses, the region with the defects may be characterised by the formation of cracks causing in later stages premature failure of the components during testing.
Almost all of this increase is due to assessments of new geographic areas and subsurface zones that had too little data for previous research and assessments".

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