Ziming Qin

PLA Navy General Hospital

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Chenlong Ji

PLA Navy General Hospital

Hao Xue

Northeastern University

Shibo Li

Shanghai Maritime University

Yongqian Liu

North China Electric Power University

Peizhong Gao

Shengli Oilfield Central Hospital

Hongyi Wei

Technische Universität Berlin

Zhongliang Zheng

Wuhan University

Yue Wei

Shengli Oilfield Central Hospital

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Shengli Oilfield Central Hospital

PLA Navy General Hospital

Northeastern University

Yanshan University

Universidad del Noreste

Nanjing Institute of Technology

Shanghai Maritime University

Hebei University of Technology

Beijing Jiaotong University

Qilu University of Technology

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Investigation of Multi-Factor Stress Corrosion Cracking Failure of Safe-End Feedwater Lines of Submarine Power System

Materials (2024)

Chenlong Ji Zhongliang Zheng Ziming Qin Hao Xue

The corrosion process under the complex safe-end feedwater line conditions was investigated via experimental lab testing and numerical simulation. The corrosion of safe-end feedwater lines was controlled through the combination of galvanic corrosion, residual stress, and flow velocity. Firstly, galvanic corrosion occurred once the 20 steel was welded with 316L stainless steel. The pitting corrosion could be observed on the 20 steel side of the weld joint. Secondly, a vortex flow was detected around the welding bump and within the pits. The growth of the pits was accelerated in both the vertical and horizontal directions. Finally, under the residual stress condition, the stress intensity factor (K) at the bottom of the pits was easier to reach than the critical stress intensity factor (KISCC). Then, pitting was transformed into stress corrosion cracking which then propagated along the weld line. Therefore, the critical factor inducing the failure of safe-end feedwater lines was the combined action of galvanic corrosion, residual stress, and flow velocity.

Boiler feedwater

Pitting Corrosion

Galvanic cell

Galvanic corrosion

10.3390/ma17061381

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A remote self-calibration design for three-phase power monitoring terminal

Journal of Physics Conference Series (2024)

Yue Wei Peizhong Gao Ziming Qin Hongyi Wei Yongqian Liu

Abstract In view of the situation that the existing three-phase power metering device is prone to excessive error and inaccurate measurement during long-term operation, and the device must be removed for re-calibration, a self-calibration power monitoring terminal based on NB-IOT communication is proposed. The power monitoring terminal adopts an external voltage transformer and current transformer, and the input signal is mV and mA level AC small signal. The integrated design of single-chip microcomputer and metering chip is used in the power monitoring terminal. The single-chip microcomputer reads and writes the data collected by the metering chip and displays and transmits the power data. After the remote measurement instruction is issued, the three-phase sinusoidal signal generator chip inside the system is used to simulate the voltage signal and current model, and the external voltage and current input channel are switched with the analog signal channel through the analog switch to complete the internal self-verification work of the device. This scheme can significantly reduce the workload caused by dismantling, installing and verifying the instrument, ensure the measurement accuracy of the instrument for a long time, and has great practical value.

10.1088/1742-6596/2703/1/012088

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Citations (1)