应用激光, 2018, 38 (3): 387, 网络出版: 2018-08-24  

激光冲击波调控NiCrBSi熔覆层表面应力状态研究

Study on Laser Shock Wave Control Surface Stress State of NiCrBSi Cladding Layer
作者单位
1 温州大学激光与光电智能制造研究院, 浙江 温州 325035
2 温州市质量技术监督检测院, 浙江 温州 325027
摘要
为探究熔覆涂层表面加载激光冲击波对其应力状态、大小及微观组织的影响, 采用高能量脉冲灯抽运YAG 激光器对NiCrBSi合金涂层进行激光冲击调控, 利用X射线衍射应力分析仪对激光冲击调控前后的合金涂层表面应力状态进行分析, 利用扫描电镜观察涂层微观组织, 探究涂层组织与激光冲击波植入拉应力的关系。结果表明, 激光双点离散冲击后, 冲击区与近冲击区均呈压应力, 最大压应力为-350 MPa。单道单层连续激光冲击后, 熔覆层压应力最大值为-328.74 MPa, 植入压应力最大可达489 MPa。激光冲击前熔覆层未搭接区较搭接区的组织更均匀, 初始晶粒更细小。激光冲击前熔覆层搭接处的最大主应力平均值约130 MPa, 与单道单层相近, 最小主应力表现为压应力均值约-20 MPa, 但激光冲击后搭接处的应力降幅仅250 MPa, 比单道单层小。
Abstract
In order to investigate the influence of laser shock wave loading on the surface of the cladding coating on its stress state, size and microstructure, a high-energy pulsed light pump YAG laser was used to control the laser shock of the NiCrBSi alloy coating. The surface stress state of the alloy coating before and after laser shock control was analyzed by X-ray diffraction stress analyzer. The microstructure of the coating was observed by scanning electron microscopy, and the relationship between coating microstructure and laser shock wave implanted tensile stress was explored. The results show that after the laser double point discrete impact, both the impact zone and the near impact zone show compressive stress, the maximum compressive stress is -350 MPa. After a single-pass single-layer continuous laser shock, the maximum cladding stress is -328.74 MPa, and the maximum implanted compressive stress can reach 489 MPa. Before laser shock, the unclad area of the cladding layer is more even than that of the overlapping area, and the initial grains are finer. The average value of the maximum principal stress at the overlap of the cladding coating before laser shock is about 130 MPa, which is similar to single-pass single-layer. The minimum principal stress shows an average compressive stress of about -20 MPa, but the stress drop at the overlap after laser shock is only 250 MPa, which is smaller than a single-pass single-layer.

陈啸, 陈志斌, 张健, 潘晓铭, 刘文文, 曹宇, 朱德华, 冯爱新. 激光冲击波调控NiCrBSi熔覆层表面应力状态研究[J]. 应用激光, 2018, 38(3): 387. Chen Xiao, Chen Zhibin, Zhang Jian, Pan Xiaoming, Liu Wenwen, Cao Yu, Zhu Dehua, Feng Aixin. Study on Laser Shock Wave Control Surface Stress State of NiCrBSi Cladding Layer[J]. APPLIED LASER, 2018, 38(3): 387.

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