Determination of the NDT Temperature and Charpy V-Notch Impact Properties of AAR TC128 Grades B Steel and A 8XX Grade B Steel

摘要

Charpy V-notch impact tests and the nil-ductility transition (NDT) temperature were redetermined for two steels. The two steels examined were normalized and inclusion shape controlled AAR (American Association of Railroads) TC128 grade B steel and control-rolled and inclusion shape controlled A 8XX grade B steel. The notch toughness, as determined by Charpy V-notch impact test, and the NDT temperature of the AAR TC128 grade B steel was found again to be better than that of the A8XX grade B steel. Metallographic investigations showed that the ferrite/pearlite grain size of the AAR TC128 grade B steel was more uniform and finer than that of the A 8XX grade B steel. Charpy V-notch impact results and NDT temperatures, presented in an earlier report were confirmed. Plate chemistry and test specimen orientation were also confirmed.