Expectation to compact neutron source RANS on neutron engineering researches

Suzuki, Hiroshi  

Neutron diffraction is known to be a non-destructive and non-contact method which can measure stress and strain inside material with a few cm order depth. Furthermore, we can obtain microstructural factors such as a microstrain, a texture and a dislocation density by analyzing the diffraction profile. In general, large experimental facilities like JRR-3 or J-PARC have been required so far for carrying out the neutron engineering researches. Of course, the high quality and high intensity neutrons obtained from such large facilities are very attractive. However, the compact neutron source which we can use anytime is rather important for industrial users to develop their products. We have already confirmed that the recognizable diffraction pattern can be measured for 10 to 30 minutes by the diffraction experiment using the compact neutron source RANS. Moreover, the obtained diffraction pattern shows enough resolution to distinguish two different phases, i.e. austenitic and ferritic phases, in steel. It is still insufficient accuracy for applying this technique to the engineering researches; however, it is expected to apply the compact neutron source to the quantitative evaluations of texture and residual austenite, which is one of important parameters for materials design, by advancing the optical system as well as analysis method.