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Separation is a commonly observed phenomenon during drop weight tear testing in high-toughness linepipe steels. Severe separation is harmful because it may cause fracturing or bursting of pipes. In this study,a quantitative measurement of separation was proposed,and using this new method,a relationship between the separation and microstructure was determined and discussed. The microstructures observed using optical and scanning electron microscopy revealed that the separation was related to the mixed ferritic and bainitic microstructures,or rather,it was related to the carbon enrichment in bainite.
Separation is a commonly observed phenomenon during drop weight tear testing in high-toughness line pipe steels. Severe separation is harmful because it may cause fracturing or bursting of pipes. In this study, a quantitative measurement of separation was proposed, and using this new method, a microscopic observation of the separation between the separation and the microstructure was determined