吴仪政,胡锦程,傅亦饶,文晓婷,张天一,王晓川.基于压痕理论的超高压射流喷射强化304钢表面特性研究[J].表面技术,2023,52(7):406-416.
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].Surface Technology,2023,52(7):406-416 |
| 基于压痕理论的超高压射流喷射强化304钢表面特性研究 |
| 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 |
| 中文关键词: 纯水射流 304钢 金属表面强化 压痕理论 微观形貌 表面粗糙度 |
| 英文关键词:pure water jet 304 steel metal surface strengthening indentation theory micro morphology surface roughness |
| 基金项目:国家自然科学基金(52074194) |
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| Author | Institution |
| WU Yi-zheng | School of Power and Mechanical Engineering,Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China |
| HU Jin-cheng | School of Power and Mechanical Engineering,Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China |
| FU Yi-rao | School of Power and Mechanical Engineering,Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China |
| WEN Xiao-ting | School of Power and Mechanical Engineering,Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China |
| ZHANG Tian-yi | School of Power and Mechanical Engineering,Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China |
| WANG Xiao-chuan | School of Power and Mechanical Engineering,Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China |
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| 中文摘要: |
| 目的 高压纯水射流喷射冲击金属表面可以提高材料的力学性能，延长其使用寿命，研究射流喷射过程中金属表面特性有助于掌握关键影响参数，为工业应用提供支撑。方法 基于压痕断裂理论推导纯水射流喷射强化金属表面压痕方程式，采用数值模拟进行验证，并使用扫描电子显微镜、三维轮廓仪、显微硬度计及μsoft analysis软件对射流冲击强化后的304钢进行试验分析，采用单因素法及正交试验法考察超高压水射流压强、靶距和横移速度3个因素对射流冲击强化304钢微观特性及表面质量的影响规律。结果 在水射流冲击强化304钢表面的过程中，压痕深度与射流压强及靶距直接相关，射流冲击可以有效改善金属表层微结构及应力分布，其强化层与剥落层的分界不明显，材料表面的微观形貌在射流压强改变时变化最大。结论 高压纯水射流对304钢的表面强化效果显著，但过高的射流能量会对材料表面造成严重的剔除效果。3个因素对表面粗糙度影响的主次顺序为:射流压强、靶距、横移速度，对表面硬度影响的主次顺序为:射流压强、靶距、横移速度。 |
| 英文摘要: |
| 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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