Abstract
The paper proposes methods for assessing the strength of grain boundaries according to the results of testing miniature specimens by impact bending. Results of bending at low temperature are given to assess the strength of grain boundaries in austenitic chromium-nickel steels. The test temperature was determined when the proportion of brittle intergranular fracture of embrittled chromium-nickel steel 10Kh18N9 is at least 90%. Three types of miniature specimens of different geometric shapes have been developed, providing approximately the same absorbed energy when tested for impact bending. It is shown when it is necessary to use such miniature specimens.
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