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Microstructure Evolution During Continuous Cooling in Niobium Microalloyed High Carbon Steels
Zhaodong Li,Qilong Yong,Zhengyan Zhang,Xinjun Sun,Jianchun Cao,Haiquan Qi,Zhi Liao 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.5
Effects of microalloyed niobium (Nb) on the austenite decomposition behaviors and microstructure evolutionduring continuous cooling in the near eutectoid steels were investigated. Compared to the Nb freesteel, the Nb microalloyed steel was refined with regard to polygonal ferrite grain, pearlite block and colonysizes. This was because its austenite grain size was smaller. The volume fraction of polygonal ferrite transformedwas more in the Nb microalloyed steels, which indicated the eutectoid carbon content exceededthat of pure carbon steel. The spheroidization of pearlite during continuous cooling was enhanced by Nbmicroalloying, mainly due to a higher critical transformation temperature and the finer pearlite structurewith smaller colony size and narrower interlamellar spacing. Hot deformation right above the equilibriumeutectoid temperature accelerated the spheroidization kinetics of pearlite, especially in the Nb microalloyedsteel.
Active control of amplitude and phase of high-power RF systems in EAST ICRF heating experiments
Zhu Guanghui,Liu Lunan,Mao Yuzhou,Zhang Xinjun,Guo Yaoyao,Ai Lin,Jiang Runhao,Qin Chengming,Zhang Wei,Yang Hua,Yuan Shuai,Wang Lei,Ju Songqing,Wang Yongsheng,Sun Xuan,Yang Zhida,Wang Jinxin,Cheng Yan 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.2
The EAST ICRF system operating space has been extended in power and phase control with a low-level RF system for the new double-strap antenna. Then the multi-step power and periodic phase scanning experiment were conducted in L-mode plasma, respectively. In the power scanning experiment, the stored energy, radiation power, plasma impedance and the antenna's temperature all have positive responses during the short ramp-ups of PL;ICRF. The core ion temperature increased from 1 keV to 1.5 keV and the core heating area expanded from jZj 5 cmto jZj 10 cm during the injection of ICRF waves. In the phasing scanning experiment, in addition to the same conclusions as the previous relatively phasing scanning experiment, the superposition effect of the fluctuation of stored energy, radiation power and neutron yield caused by phasing change with dual antenna, resulting in the amplitude and phase shift, was also observed. The active control of RF output facilitates the precise control of plasma profiles and greatly benefits future experimental exploration.