激光冲击强化9Cr18钢及协同制备表面微坑研究  

Laser Shock Processing of 9Cr18 Steel and Synergistic Preparation of Surface Micro-pits

作　　者：陈秀玉 林郁茹 李科林 陈俊英 蒋清山 方芳[1] 许志龙[1] 黄国钦[2] CHEN Xiuyu;LIN Yuru;LI Kelin;CHEN Junying;JIANG Qingshan;FANG Fang;XU Zhilong;HUANG Guoqin(College of Marine Equipment and Mechanical Engineering,Jimei University,Fujian Xiamen 361000,China;Huaqiao University,Fujian Xiamen 361000,China)

机构地区：[1]集美大学海洋装备与机械工程学院,福建厦门361000 [2]华侨大学,福建厦门361000

出　　处：《表面技术》2024年第11期193-204,共12页Surface Technology

基　　金：福建省自然科技基金青年项目(2021J05168);福建省自然科学基金面上项目(2021J01855);福建省重大专项(2022HZ024009);福建省科技厅项目(2021HZ024006)。

摘　　要：目的探索9Cr18钢经激光冲击强化后,二次激光冲击制备表面微坑的可行性和相关工艺。方法利用不同工艺参数对9Cr18钢试样进行单点冲击,使用激光共聚焦对单点冲击诱导的微坑进行轮廓形貌检测,使用显微硬度仪测量微坑区域的硬度;通过激光冲击对9Cr18钢进行全覆盖表面强化,并进行二次激光冲击,以制备表面微坑。结果对于单点冲击,表面凹坑深度随着激光冲击能量的增大而增大,并非呈线性增大。当冲击能量为12 J时,凹坑深度达到38.39μm。对于同能量单点双次冲击,其凹坑深度比单点冲击大。当冲击能量为12 J时,双次冲击深度最大达到49.05μm。在能量梯度叠加冲击时,以6 J为第1次冲击能量,将第2次冲击能量提高到12 J,此时凹坑深度达到58.61μm。对于不同脉宽冲击,在脉宽为26 ns时,不同能量冲击的凹坑深度均达到最深。经激光冲击强化后,采用不同能量进行二次冲击,在能量为12 J时凹坑深度为19.79μm。采用不同脉宽进行二次冲击,在脉宽为22、26 ns时,凹坑深度为13.61μm。结论表面微坑的深度随着能量、脉冲宽度和冲击次数的增加而增加;表面微坑的硬度随着能量和次数的增加而增大,硬度随着脉宽的增加呈先减小后增大的趋势;采用激光冲击工艺协同处理,可以强化9Cr18钢表面,并制备出一定深度的微坑,可为激光冲击对9Cr18钢的强化及表面织构化提供理论指导和工艺基础。The work aims to explore the feasibility and related processes of preparing surface micro-pits by secondary laser impact after laser shock processing of 9Cr18 steel.The single-point impact of 9Cr18 steel samples with different process parameters was carried out,the Laser Confocal was used to measure the two-dimensional morphology profile of micro-pits texture by single-point laser shock induction and the hardness of micro-pit induced by single-point impact was measured by microhardness tester.The full coverage surface of 9Cr18 steel was impacted by laser shock processing to obtain the surface strengthening layer,and the micro-pit texture was treated by secondary laser impact induction to form the surface texture.For the micro-pit prepared by single-point impact,the depth of the surface micro-pits increased with the increase of laser impact energy,but it was not linear.When the impact energy was 12 J,the depth of the micro-pits reached 38.39μm.When the single-point double impact was carried out under the same energy,the depth of the surface micro-pits slightly increased compared with the single-point single impact under the same energy.When the impact energy was 12 J,the maximum depth of the micro-pits obtained by the double impact was 49.05μm.When the superimposed impact of different energy gradients was carried out and 6 J was used as the first impact energy and the second impact energy gradually increased to 12 J,the surface micro-pit depth after the superimposed gradient energy reached 58.61μm.For the impact of different energy and different pulse width,when the pulse width was 26 ns,the micro-pit depth under the impact of different energy reached the deepest and gradually increased to a stable depth with the increase of pulse width.After laser shock processing,different energies were used for secondary impact,and the depth of the micro-pits reached 19.79μm when the secondary impact energy was 12 J.After laser shock processing,the depth of the micro-pits reached 13.61μm when the secondary impact pulse wid

关 键 词：9Cr18钢 激光诱导 表面织构 表面形貌 激光参数 

分 类 号：TH142.2[一般工业技术—材料科学与工程]