不锈钢表面激光熔覆铁基非晶涂层研究  

Laser Cladding Fe-Based Amorphous Coatings on Stainless Substrate

作　　者：王彦芳[1] 栗荔[1] 鲁青龙[1] 丁伟涛 石志强[1] 

机构地区：[1]中国石油大学(华东)材料科学与工程系,山东东营257061 [2]山东石大胜华化工集团股份有限公司,山东东营257061

出　　处：《中国激光》2011年第6期177-180,共4页Chinese Journal of Lasers

基　　金：山东省自然科学基金(Q2008F12);中国石油大学(华东)博士基金(Y060314)资助课题

摘　　要：采用5 kW横流CO2激光器,在304 L不锈钢基体上激光熔覆了Fe75.5C7.0Si3.3B5.5P8.7非晶涂层。借助光学显微镜、X射线衍射仪、综合热分析仪和显微硬度计,对熔覆层的相组成、组织结构、热稳定性和显微硬度进行了较为系统的研究。实验结果表明,涂层无微观裂纹、夹杂等缺陷,与基体结合良好。涂层主要由非晶相和Fe3P、Fe2Si等金属间化合物组成。涂层具有明显的外延生长特征,在涂层中部区域出现了大片无组织特征的非晶区。涂层的晶化温度为793~835 K,在793 K以下不会发生晶态的转变,具有较高的热稳定性;涂层的显微硬度呈梯度分布,中部硬度最高,最高硬度为441.3 HV,大约是基体硬度的3倍。The Fe75.5C7.0Si3.3B5.5P8.7 amorphous alloy powder is cladded on 304 L stainless substrate by a 5-kW cross flow CO2 laser.The phase,microstructure,thermal stability and microhardness of the coatings are systematically analyzed by optical microscope,X-ray diffractometer（XRD）,integrated thermal analyzer and microhardness meter.No crack or void is observed within the coating.The coating has a good metallurgical bond with substrate.The coating mainly consists of amorphous,Fe3P and Fe2Si phases.The microstructure in the near interface region exhibits obvious extensive growth characteristics.A large area of amorphous region is observed in the middle of the coating.The crystallization temperature of the coating begins at 793 K and ends at 835 K.The coating microhardness shows a graded distribution,and the hardest zone is in the middle of the coatings.The highest hardness of the coating is 441.3 HV,which is about 3 times of that of 304 L stainless substrate.

关 键 词：激光技术 铁基非晶涂层 组织结构 热稳定性 显微硬度 

分 类 号：TG174.4[金属学及工艺—金属表面处理]