Abstract
We propose a method for automated determination of grain geometry, based on the analysis of digital metallographic images of the microstructure of exploited 12Kh1MF steam-pipeline steel. This method enables one to analyze images with indistinctly delineated grain boundaries by means of interactive processing. We have shown that, with approach to the pipe surfaces, the grain size grows at its straight part and decreases at its bend in the tension zone, which is evidence of recrystallization processes in high-strained metal. If one evaluates grain sizes by changes in the metal hardness, then the distribution of grain sizes across the pipe wall in the tension zone of bend does not agree with the Hall – Petch law, which can be a result of intense operational degradation of the bend metal.
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