| WU Yi-zheng,HU Jin-cheng,FU Yi-rao,WEN Xiao-ting,ZHANG Tian-yi,WANG Xiao-chuan.Surface Characteristic of 304 Steel after Ultra-high Pressure Jet Peening Based on Indentation Theory[J],52(7):406-416 |
| Surface Characteristic of 304 Steel after Ultra-high Pressure Jet Peening Based on Indentation Theory |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.07.037 |
| KeyWord:pure water jet 304 steel metal surface strengthening indentation theory micro morphology surface roughness |
| Author | Institution |
| WU Yi-zheng |
School of Power and Mechanical Engineering,Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan , China |
| HU Jin-cheng |
School of Power and Mechanical Engineering,Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan , China |
| FU Yi-rao |
School of Power and Mechanical Engineering,Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan , China |
| WEN Xiao-ting |
School of Power and Mechanical Engineering,Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan , China |
| ZHANG Tian-yi |
School of Power and Mechanical Engineering,Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan , China |
| WANG Xiao-chuan |
School of Power and Mechanical Engineering,Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan , China |
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| Abstract: |
| Using high pressure water jet to impact the metal surface can make the mechanical properties of the material better and increase its service time. The analysis on properties of the metal surface during the jet peening can assist to grasp the key influencing parameters, so as to provide industrial support. This paper derived the indentation equation of metal surface strengthened by pure water jet based on indentation fracture theory and verified it by numerical simulation, then studied the influence that jet pressure, standoff distance and transverse speed have on the surface micro morphology, surface roughness and surface hardness of 304 steel which was impacted by high pressure pure water jet. The main experimental instrument was a water jet scalpel, the moving speeds of its x-axis, y-axis and z-axis were 6, 6, and 1 m/min respectively, the maximum moving speed was 6 m/min, the control accuracy was ±0.01 mm, and the diameter of the nozzle was 1.2 mm. In this work, a three-dimensional profiler and a scanning electron microscope were used to observe the surface micro characteristic of the material, the surface roughness of the material was measured by a three-dimensional surface topography measurement system and μsoft analysis software, and a micro hardness tester was used to measure the surface hardness. The three factors of jet pressure, standoff distance, and traverse speed were used as experimental variables to conduct the experiment that the 304 steel was strengthened by high pressure pure water jet. In the experiment, the jet pressure was 180, 240 and 300 MPa respectively, the standoff distance was 10, 15 and 20 mm respectively, the transverse speed was 400, 600 and 800 mm/min respectively. First, a single factor experiment was conducted to explore the influence law of the three factors, then an orthogonal experiment was used to find out the extent of this influence. It was discovered that the indentation depth was directly related to jet pressure and standoff distance in the water jet treatment. Jet treatment can effectively improve the microstructure and stress distribution of the metal surface, and the boundary between the strengthened layer and the peeled layer was not obvious. Its surface micro morphology changed most obviously when the jet pressure changed. In the single factor experiment, when the jet pressure increased, the surface roughness of the material increased first and then decreased. When the standoff distance and transverse speed increased, the surface roughness continued to decrease. When the jet pressure and the traverse speed increased, the surface hardness of the material increased first and then decreased. When the standoff distance increased, the surface hardness continued to decrease. It is concluded that the high-pressure pure water jet has a significant effect on the surface strengthening of 304 steel, but it will cause a serious removal effect on the surface of the material if the jet energy is too high. The order of the effect that the three factors have on surface roughness is:jet pressure, standoff distance, transverse speed, the order of the effect that the three factors have on surface hardness is:jet pressure, standoff distance, transverse speed. |
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