Nondestructive measurements have been carried out in M250 grade maraging steel specimens subjected to solution annealing at 1093 K for 1 h followed by ageing at 755 K for various durations in the range of 0.25 to 100 h. Different NDE techniques such as ultrasonic velocity, magnetic barkhausen emission (MBE), positron annihilation spectroscopy (PAS), eddy current and X-ray diffraction (XRD) have been employed for comprehensive characterization of microstructural features evolved consequent to aging treatment.
展开▼
