中国激光, 2011, 38 (6): 0603017, 网络出版: 2011-05-18
不锈钢表面激光熔覆铁基非晶涂层研究 下载: 590次
Laser Cladding Fe-Based Amorphous Coatings on Stainless Substrate
激光技术 铁基非晶涂层 组织结构 热稳定性 显微硬度 laser technique Fe-based amorphous coating microstructure thermal stability microhardness
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。
Abstract
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.
王彦芳, 栗荔, 鲁青龙, 丁伟涛, 石志强. 不锈钢表面激光熔覆铁基非晶涂层研究[J]. 中国激光, 2011, 38(6): 0603017. Wang Yanfang, Li Li, Lu Qinglong, Ding Weitao, Shi Zhiqiang. Laser Cladding Fe-Based Amorphous Coatings on Stainless Substrate[J]. Chinese Journal of Lasers, 2011, 38(6): 0603017.