舒林森,林冉

• 1:陕西理工大学机械工程学院
• 2:陕西省工业自动化重点实验室

摘要(Abstract)：

为了在Q235钢基材上制备出性能优良的铁基合金熔覆涂层,开展基于均匀设计的铁基合金粉末激光熔覆工艺参数优化方法研究。根据熔覆机工艺能力和实践经验选取待优化工艺参数范围,运用均匀化设计方法产生混合水平实验表。采用"光内送粉"在Q235钢基材上制备铁基合金(Fe45)熔覆层,利用超景深显微镜和维式显微硬度计分析了熔覆层的表面形貌、稀释率及硬度。基于实验数据逐步回归分析扫描速度、离焦量、激光功率、送粉速度对熔覆层稀释率和显微硬度的影响。结果表明:不同工艺参数对熔覆层的稀释率及显微硬度具有显著影响;回归分析的三次多元多项式适合于表征工艺参数对熔覆层稀释率和显微硬度的影响规律,回归方程的交互项表明扫描速度、离焦量、激光功率、送粉速度的交互作用影响着稀释率和显微硬度;对稀释率和显微硬度进行数学回归,分析发现该铁基合金粉末的激光熔覆最佳工艺参数为:扫描速度7 mm/s、离焦量2 mm、送粉速度22 g/min、激光功率2.7 kW。验证实验表明,以最优参数制备的熔覆层硬度均匀度高、与基材形成了连续的白亮凝合线,无裂纹及气孔,熔覆层整体质量较好。

关键词(KeyWords)： 铁基合金;激光熔覆;均匀设计;稀释率;显微硬度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51505268);; 装备预研领域基金重点项目(61400040404);; 陕西省教育厅重点项目(20JS020);; 陕西省工业自动化重点实验室开放课题研究基金(SLGPT2019KF01-16)

作者(Author): 舒林森,林冉

DOI: 10.13289/j.issn.1009-6264.2020-0425

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