高速激光熔覆Fe基非晶涂层裂纹及组织分析  

Crack and Microstructure Analysis of High-speed Laser Clad Fe-based Amorphous Coating

作　　者：俞伟元[1] 景瑞 董鹏飞 吴保磊 李扬[1] 强潇 YU Weiyuan;JING Rui;DONG Pengfei;WU Baolei;LI Yang;QIANG Xiao(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050

出　　处：《材料导报》2025年第7期134-139,共6页Materials Reports

基　　金：甘肃省科技重点研发计划(20YF8GA053)。

摘　　要：为了减小激光喷涂熔覆层中的裂纹率,采用高速激光熔覆技术,在增大激光功率的条件下大幅增大激光扫描速度,制备了Fe基非晶熔覆层。采用X射线衍射仪(XRD)、光学显微镜以及配置能谱仪(EDS)的电子显微镜等研究了熔覆层的形貌和不同区域物相;用Jade软件计算了熔覆层的相对非晶含量;用多物理场仿真软件COMSOL Multiphysics模拟了熔覆层的温度场和热应力。研究发现,高速激光熔覆得到的Fe基熔覆层晶粒尺寸、非晶相含量和裂纹率分别随激光扫描速度的增大而减小、升高和减小。与常规扫描速度得到的熔覆层相比,不同扫描速度下的高速激光熔覆层非晶相含量均较低。模拟结果证明,通过增大激光扫描速度可以减小熔覆层中的热输入,从而减小其热应力,降低熔覆层的开裂倾向。In order to reduce the crack rate in the laser spraying clad layer,the Fe-based amorphous clad layer was prepared by using high speed laser cladding technology and greatly increasing the laser scan speed under the condition of increasing the laser power.The morphology and different phases of the clad layer were studied by means of X-ray diffractometry(XRD),optical microscopy,and electron microscopy accompanied by energy dispersive spectrometry(EDS).The relative amorphous content of the clad layer was calculated by Jade software.The temperature field and thermal stress of clad layer were simulated by COMSOL Multiphysics.It was found that the grain size,amorphous phase content,and crack rate of the clad layer changed inversely,positively,and inversely with the increase of laser scan speed,respectively.The prepared clad layer,compared with that clad with the conventional scan speed,had a lower amorphous phase content.The simulation results confirmed that increasing the laser scan speed led to the reduction of the heat input in the clad layer,thus mitigating the thermal stress and suppressing the cracking tendency of the clad layer.

关 键 词：Fe基非晶涂层 激光熔覆 裂纹率 非晶相含量 

分 类 号：TG174.445[金属学及工艺—金属表面处理]