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Deuterium distribution and behavior of blisters in pre-damaged and undamaged tungsten

Tungsten 2024年第3期6卷 647-656页

作者： Cong Li Xiao-Wa Wang Ran-Ran Su Xuan-Xin Hu Shu-Guang Wei Han-Jun Tu Li-Qun Shi Hong-Liang Zhang Key Laboratory of Nuclear Physics and Ion-Beam Application Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Materials Science and Engineering University of WisconsinMadison WI 53706USA

Tungsten(W),as a plasma-facing material,is subjected to high fluence plasma,resulting in both radiation damage and deuterium(D)*** study explores the blistering behavior and D supersaturated layers in both pre-damaged and undamaged W *** achieve a uniform damage profile similar to neutron irradiation,carbon(C)ions with multiple energies and angles were *** samples were further irradiated with low-energy D ions under two fluences at temperatures from~380 to 640 *** various experimental techniques,we found that pre-damaged W samples can effectively suppress the formation of blistering and lower the threshold temperature at which the surface remains free of *** also observed the prominent D supersaturated peaks within the depth of 20 nm in both pre-damaged and undamaged ***,a close correlation between blistering and the D supersaturation was *** results suggest that neutron irradiation in the fusion reactors could increase the critical D concentration for blistering,while a greater depth of damage facilitated the inward diffusion of D,thereby reducing the D concentration gradient and alleviating surface blistering.

关键词： Tungsten Deuterium Supersaturated layer Blister Ion irradiation pre-damage

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Experimental study on motion and mechanical characteristics of the vertical wheel in the rock-breaking process

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Petroleum Science 2023年第1期20卷 495-506页

作者： Yan Yang Ying-Xin Yang Hai-Tao Ren Qing-Liang Qi Ze-Quan Huang Chun-Xiao Zhou International Faculty of Applied Technology Yibin UniversityYibinSichuan 644000China College of Mechanical and Electrical Engineering Southwest Petroleum UniversityChengduSichuan 610500China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduSichuan 610500China Faculty of Intelligence Manufacturing Yibin UniversityYibinSichuan 644000China College of Engineering Southwest Petroleum UniversityNanchongSichuan 637001China

Polycrystalline diamond compact(PDC)drill bit often performs with low ROP,short service life and poor stability under complicated and difficult to drill ***,a vertical wheel PDC bit is proposed,which is a new drill bit technology applying an integrated unit combining the tooth wheel and the rotary shaft ***,the experiments on motion and mechanical characteristics of the vertical wheel under the conditions of tooth shape and number of teeth,normal deflection angle of the wheel,and different cutting depth were carried out using variable parameter experimental device,and the movement,force law,and crushing specific work of vertical wheel under different experimental conditions were *** comparative experiments of PDC cutting rock breaking under the conditions of parallel cutting of PDC unit and pre-damage of the wheel were also carried out,and the cutting load of PDC teeth under pre-damage conditions is between 38.72% and 70.95%lower than that of parallel cutting was ***,a comparative experiment of indoor drilling between vertical wheel PDC bit and conventional PDC bit was carried *** show than when drilling in gravel rock,under the same WOB,the torque response of vertical wheel PDC bit is equivalent to that of the PDC bit,while the ROP of vertical wheel PDC bit is 22.94%-53.33% higher than that of conventional PDC bit,and the threedimensional acceleration of the vertical wheel PDC bit is 19.17%-76.23% of that of the PDC *** experimental results contribute to a better understanding of vertical wheels and provide technical support for their use in PDC bits.

关键词： Difficult to drill formation Vertical wheel Vertical wheel PDC bit Rock-breaking mechanism pre-damage

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