刘明霞,姚小凤,畅庚榕,代芳

• 1:西安文理学院陕西省表面工程与再制造重点实验室
• 2:西安文理学院西安市植入器械成形与优化重点实验室
• 3:西安陕鼓动力股份有限公司

摘要(Abstract)：

采用中心送粉式超高速激光熔覆方法在Q460钢基体制备Fe基合金涂层，并对涂层进行激光重熔处理，之后利用激光共聚焦(LCSM)、光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)及电化学工作站、显微硬度计、摩擦磨损仪分析重熔前后熔覆层的宏观形貌、微结构及性能。同时，利用COMSOL软件模拟熔覆和重熔过程涂层热场分布。结果表明：中心送粉式超高速激光单次熔覆可成形微米级厚的Fe基涂层，涂层无裂纹、孔洞等缺陷，稀释率仅为6.82%;重熔后的涂层平整度增加且近表面晶粒明显细化，沿生长方向呈梯度结构；重熔样品具有更高的耐腐蚀性，硬度提高约33%,表现出更优的耐磨性；模拟发现，重熔过程中涂层表面的温度梯度明显高于涂层内部，导致涂层梯度结构的形成，涂层表面晶粒细化有利于其表面耐蚀耐磨综合性能的提升。

关键词(KeyWords)： 超高速激光熔覆;激光重熔;微观组织;晶粒细化;耐蚀性;耐磨性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年基金项目(52101097);; 陕西省自然科学基础研究计划项目(2023KJXX-068,2022CGBX-13,2022JM-253,2021JM-512);; 西安市科协青年人才托举计划(095920221361);; 陕西省表面工程与再制造重点实验室开放基金(2022SSER01)

作者(Author): 刘明霞,姚小凤,畅庚榕,代芳

DOI: 10.13289/j.issn.1009-6264.2023-0297

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