Characterizing microstructural changes in ferritic steels by positron annihilation spectroscopy: Studies on modified 9Cr–1Mo steel

摘要: Abstract Applicability of positron annihilation spectroscopy in probing the microstructural changes ferritic steels has been investigated with thermal treatment studies on modified 9Cr–1Mo steel, during 300–1273 K. Positron lifetime results are compared those ultrasonic velocity and hardness techniques two initial conditions i.e., normalized tempered condition as well only condition. In first case, is found to be sensitive small metal carbide precipitation which could not probed by other techniques. later defect annealing until 673 K distinguishing growth coarsening stages 773–1073 K. The present study suggests that combining lifetime, measurements, it possible distinguish distinct microstructures occurring at different stages.