Magnetic properties derived from major hysteresis loops are sensitive to the microstructures of iron-based steels and have therefore been used for nondestructive evaluation of degradation in ferromagnetic materials contained in structural components. A permeability obtained from ac small field excitation may be a more us eful parameter than one obtained from a major hysteresis loop from the viewpoints of electricity consumption and real-time measurement. In this paper, the relati on between the ac permeabi...
英字タイトル:
Evaluation for Mechanical Properties of Ferromagnetic Steels by AC Permeability

This study demonstrates the possibility of applying magnetic methods to pressure vessel surveillanc e at nuclear power plants. Magnetic hesteresis-minor-loop measurement and TEM observation were pref ormed on thermally aged Fe-1.0wt%Cu model alloys. Minor loop parameters decreased with increasing a ging time. The mechanism is discussed in terms of Cu precipitation behaviors of cold-rolled alloys....
英字タイトル:
Relation between Precipitation Behaviors and Magnetic Properties in Cold-rolled FeCu Model Alloys

This study demonstrates the possibility of applying magnetic methods to pressure vessel surveillance at nuclea r power plants. Charpy impact test and magnetic hysteresis-loop measurement were preformed on Fe-1.0wt%Cu model alloys. The ductile-brittle transition temperature and the coercivity increased by cold-rolling and thermal agi ng. This correlation originates from an increase in the dislocation density and a formation of Cu precipitates....
英字タイトル:
Magnetic Properties of FeCu Model Alloys Embrittled by Cold-rolling and Thermal Aging

This study developed an apparatus for the measurement of magnetic properties of tensile test specimen. Experimental results show that the difference shape of BH curves of the steels cold-rolled with different rolling reduction. The coercive force has good correlation with Ductile-brittle transition temperature and Vickers hardness of the specimen. This result indicate s the possibility of nondestructive evaluation for the mechanical properties of tensile test pieces using magnetic methods....
英字タイトル:
NDE for Mechanical Properties of Ferromagnetic Steels using Magnetic Measurement Apparatus