【摘 要】
：
When a gun fires the diffusion of chemical species from the propellant gas, such as CO, CO2, H2, H2O and N2, into the hot surface through the microcracks forms
【机 构】
：
Military Engineering Department,School of Mechanical Engineering
论文部分内容阅读
When a gun fires the diffusion of chemical species from the propellant gas, such as CO, CO2, H2, H2O and N2, into the hot surface through the microcracks forms reaction products and speeds up the erosion process.Therefore, crack repairing and healing can be a possible measure for protecting against erosion of gun bore. The present study develops a novel nanocomposite with the size of 30 - 150 nm to repair and heal the microcracks so that the propellant gas can be prevented from reacting with the steel. Sample of gun steel 40CrNiMoV plate (10 mm× 10 mm × 2 mm) is prepared and a fishtail crack is generated through a repeated plastic deformation process. The crackrepairing results show that the fishtail crack become shorter and narrower. A new phase is formed, which is found to have the elements, such as Ca, La, from the raw materials of nanocomposite by energy spectrum analysis.
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