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So Kamada,Toshiro Itoga,Yasuhiro Unno,Wataru Takahashi,Takuji Oishi,MAMORU BABA 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We have measured energy angular distribution of secondary neutrons for 1) ^7Li(p,xn) and ^9Be(p,xn) reactions with thin targets at 70 MeV, 2)^9Be(p,xn) reactions with a thick target at 11 MeV, using the time-of-flight technique at Tohoku University Cyclotron facility. Data were obtained at several laboratory angles from 0° to 110° using a beam swinger system and an NE213 scintillation detector placed at a well collimated neutron flight path. The energy range was from maximum to ~4 MeV (at 70 MeV). The spectrum results at 70 MeV showed very strong angular dependence which should be considered in detail in the applied purposes, while the data at 11 MeV showed much milder dependence and in fair agreement with the prediction of MCNPX.
Characteristics of Barkhausen Noise Properties and Hysteresis Loop on Tensile Stressed Rolled Steels
Hiroaki Kikuchi,Katsuyuki Ara,Yasuhiro Kamada,Satoru Kobayashi 한국자기학회 2011 Journal of Magnetics Vol.16 No.4
The rolled steels for welded structure applied tensile stress have been examined by means of magnetic Barkhausen noise (MBN) method and of a physical parameter obtained from a hysteresis loop. The behaviors of MBN parameters and coercive force with tensile stress were discussed in relation to microstructure changes. There is no change in MBN parameters and coercive force below yield strength. The coercive force rises rapidly with tensile stress above yield strength. On the other hand, the rms voltage and the peak in averaged rms voltage take a maximum around yield strength and then decreases. The magnetomotive force at peak in the averaged rms voltage shows a minimum around yield strength. These phenomena are attributed to the combined effects of cell texture and dislocation density. In addition, the behaviors of MBN parameters around yield strength may be reflected by the localized changes in strain field due to the formation of dislocation tangles.
Magnetic NDE for Sensitization of Inconel 600 Alloy
Hiroaki Kikuchi,Takaki Sumimoto,Yasuhiro Kamada,Satoru Kobayashi 한국자기학회 2013 Journal of Magnetics Vol.18 No.3
Inconel 600 alloy, Ni base alloy, is widely used for steam generator tubings where sensitization occurs at grain boundaries and sensitization will induce tubing failures. This alloy has usually paramagnetic property, however, it transforms into ferromagnetic property along grain boundaries when sensitization occurs: this means NDE using magnetism for sensitization is possible. Therefore, in this study, Inconel 600 alloys were heat treated at 873 K from 0 to 400 hours so as to generate sensitization and their magnetic properties were investigated in detail. The saturation and the residual magnetization increase with increasing heat treatment time and take a maximum. On the other hand, the coercive force decreases with the increase in time of heat treatment. We confirmed that characteristics at only grain boundaries change into ferromagnetic phase by a MFM observation. As a trial for industrial application, heat treated Inconel 600 alloy was scanned by a magnetic field sensor, and the variations in magnetization were obtained nondestructively. The results indicate a feasibility of magnetic NDE for sensitization of Inconel 600 alloy.