Impact Fracture Behavior of Large-Diameter X80 Line Pipes

摘要

Pendulum instrumented impact test and Charpy impact test were employed to investigate the fractural behaviors of the large diameter X80 line pipes. The results revealed that the pendulum instrumented impact absorbed energy decreased significantly as the testing temperature lowered down, and the brittle appearance arose on the impact fracture morphology as well. However, the Charpy impact test result showed little difference when tested at the given temperatures, it is deduced that the increase of the specimen thickness improves the fracture sensibility of the pipeline steel on temperature, which makes great contribution to the difference between pendulum instrumented impact test result and Charpy impact test result.