激光功率对27SiMn钢激光熔覆力学性能的影响  

Effect of Laser Power on Mechanical Properties of Laser Cladded 27SiMn Steel

作　　者：衡钊 舒林森[1,2] Heng Zhao;Shu Linsen(School of Mechanical Engineering,Shaanxi University of Technology,Hanzhong,Shaanxi 723001,China;Shaanxi Key Laboratory of Industrial Automation,Hanzhong,Shaanxi 723001,China)

机构地区：[1]陕西理工大学机械工程学院,陕西汉中723001 [2]陕西省工业自动化重点实验室,陕西汉中723001

出　　处：《中国激光》2022年第8期112-120,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(51505268);陕西省教育厅重点项目(20JS020);陕西省教育厅专项科研计划项目(21JK0562);陕西省工业自动化重点实验室开放课题研究基金(SLGPT2019KF01-16);国防科技重点实验室基金(JCKY61420052022)。

摘　　要：为了获知激光功率对激光熔覆修复立柱用钢的影响规律,并找出熔覆层力学性能最优时的激光功率参数,采用单因素变量法,保持扫描速度20mm/s、送粉量18g/min、离焦量0和光斑直径2mm不变,分别研究了激光功率为1500,1800,2100,2400 W时熔覆层的显微组织、拉伸性能及其断口形貌。结果表明:当激光功率为1800 W时,在立柱用钢表面上制备的FeCrNiSi合金涂层的热影响区深度最小值约为360μm;涂层显微组织主体由均匀的胞状晶和柱状晶组成;涂层的延伸率在熔覆试件中最高,约为5.3%;拉伸试件涂层断口呈韧性特征,涂层的塑性在熔覆试件中最强。综合考虑激光功率对27SiMn钢激光熔覆涂层的截面形貌、显微组织、力学行为特征以及断口形貌的影响,得出1800 W是最佳激光熔覆功率,在此功率下可制备出结合紧密且塑性较好熔覆涂层。Objective The laser cladding technology can generate a functional coating based on metallurgical combination of high strength,anti-wear,and corrosion resistance on the 27SiMn steel surface of hydraulic support column by rapidly melting and solidifying high performance alloy materials with laser energy,thus the strength and support safety performance of the column can be improved.However,during the coating generation process,a sub-stable material structure of multi-phase heterogeneous materials is formed inside the coating due to the complex thermo-physical field reaction of the laser with the powder and the substrate.The laser parameters directly influence the microstructure and mechanical properties of the cladded coating,in which laser power is an important factor influencing the tissue characteristics and the mechanical properties of the cladded coating.However,there are few studies on the effect of laser power on the characteristics of the organization and the mechanical behaviors of laser cladded 27SiMn steels,which is not conducive to the engineering application of laser cladding and remanufacturing of column parts.In order to obtain the effect of laser power on the organization and properties of the 27SiMn steel repaired by laser cladding,and to find out the optimal laser power parameters for the cladding layer,the laser cladding process and the mechanical properties of the 27SiMn steel are studied experimentally.Methods In this paper,the FeCrNiSi alloy powder is used as the material for preparing the coating.The alloy powder is blown onto the surface of the 27SiMn steel base material by a high-purity argon gas(mass fraction of 99.99%),while the alloy powder and the part of the metal on the surface of the base material are rapidly melted under the action of a high-energy laser beam to generate the alloy coating.First,a single-factor variable approach is used in the experiments.Four different laser cladding schemes with 1500 W,1800 W,2100 W,and 2400 Wpowers are designed to produce the specimens.The specimen

关 键 词：激光技术 激光功率 显微组织 拉伸性能 断口形貌 

分 类 号：TG495[金属学及工艺—焊接]