激光熔覆工艺创新发展及其在材料创制中的应用
Novel progress of laser cladding and its applications in material fabrication
激光熔覆利用高能激光将熔覆材料与基体表层快速熔化并凝固为冶金结合涂层,是金属零件表面高性能涂层制备和再制造修复的先进技术手段。近年来,激光熔覆技术已从最初的表面涂层制备技术,发展为集高性能涂层制备、损伤件再制造修复及增材制造于一体的综合性材料加工技术,并在新材料研发与高性能涂层制备方面展现出巨大的发展潜力。本文在系统阐述激光熔覆过程冶金特点的基础上,重点综述了激光熔覆工艺的创新发展,涵盖高效化、复合化、专用化及智能化四个主要方向。在此基础上,本文聚焦于激光熔覆在材料创制中的功能与应用,系统梳理了其在传统合金体系、高熵合金、非晶合金、金属基复合材料及功能梯度材料等领域的制备与性能调控研究进展,归纳了各类材料的强化机制与典型应用场景。基于激光熔覆的材料创制仍面临突出挑战,主要包括非平衡凝固理论不完善、工艺-组织-性能定量模型缺失、过程监控与性能评价技术不足。展望未来,该领域应着力推进工艺数智化、新材料体系创新、极端环境适配、多能场复合与工艺链集成等方向发展。
Laser cladding uses a high-energy laser to rapidly melt cladding materials with the substrate surface, forming a metallurgically bonded coating upon solidification. It is a key technology for producing high-performance surface coatings and remanufacturing metallic components. Recently, laser cladding has evolved from a surface coating technique into a comprehensive process integrating coating fabrication, repair of damaged parts, and additive manufacturing, showing great potential in new material development. This review first elaborates the metallurgical characteristics of laser cladding metals, then highlights process innovations in four directions: high efficiency, hybridization, specialization, and intellectualization. It further addresses the role of laser cladding in material development and fabrication, systematically reviewing research progress on conventional alloys, high-entropy alloys, amorphous alloys, metal matrix composites, and functionally graded materials, and summarizing their strengthening mechanisms and typical applications. However, challenges remain for laser cladding fabricating materials, including incomplete non-equilibrium solidification theories, lack of quantitative process-microstructure-property models, and inadequate monitoring and evaluation techniques. Future efforts should prioritize data-driven intelligent optimization, novel material system design, extreme-environment adaptability, and integration of multi-energy-field hybrid processes and combined process chains.
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国家重点研究计划重点专项(2023YFB4606600)
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