基于因瓦效应的高耐磨原位复合涂层激光沉积机理

The laser deposition coating is widely used in the field of surface strengthening and remanufacturing for the key part. But the crack of the laser deposition coating limits the application of the technology. Accordingly, based on the invar effect and in situ reinforce, the low residual stress and high strengthening coating can be obtained, which ensures the coating with the free crack can be achieved. A new type of laser deposition technology is presented based on the low expansion of the alloy matrix in this project. The existence of invar effect in composite coating, the dependence of invar effect on the crack in coating and the strengthening mechanism of in situ reinforce on the coating will be studied, which is favor to understand mechanism of laser deposition of in situ anti-wear composite coating based on invar effect. After finishing the project, the control of the crack in laser deposition coating will be provided as a new method, which is important to investigate the scientific problem and apply the laser surface strengthening technology.

激光沉积涂层在关键零部件的表面强化与再制造领域具有广阔的应用前景，但涂层的高残余应力容易诱发涂层开裂，限制了该技术的广泛应用。针对激光沉积涂层易开裂难题，本项目充分利用因瓦效应的“反常热膨胀行为”，实现涂层的低残余应力，确保涂层的零开裂，同时应用复合材料的原位增强提高涂层的硬度和耐磨性，提出了基于因瓦效应的激光沉积无裂纹高耐磨原位复合涂层的方法。探索原位复合涂层中因瓦效应的稳定性，揭示因瓦效应和原位复合涂层开裂的关联性，分析复合涂层原位增强机制，阐明基于因瓦效应的高耐磨原位复合涂层激光沉积机理。本项目的实施，将有助于进一步认识激光沉积涂层裂纹控制机理，为激光沉积零开裂涂层提供了新思路，对于科学问题的探索和加快我国激光表面强化技术应用具有重大的意义。

激光沉积涂层在关键零部件的表面强化与再制造领域具有广阔的应用前景，但涂层的高残余应力容易诱发涂层开裂，限制了该技术的广泛应用。针对激光沉积涂层易开裂难题，本项目充分利用因瓦效应的“反常热膨胀行为”，实现涂层的低残余应力，确保涂层的零开裂，同时应用复合材料的原位增强提高涂层的硬度和耐磨性，提出了基于因瓦效应的激光沉积无裂纹高耐磨原位复合涂层的方法。探索原位复合涂层中因瓦效应的稳定性，揭示因瓦效应和原位复合涂层开裂的关联性，分析复合涂层原位增强机制，阐明基于因瓦效应的高耐磨原位复合涂层激光沉积机理。本项目的实施，将有助于进一步认识激光沉积涂层裂纹控制机理，为激光沉积零开裂涂层提供了新思路，对于科学问题的探索和加快我国激光表面强化技术应用具有重大的意义。