增材制造钛合金激光喷丸组织及热稳定性研究进展

Research progress on laser shock peened microstructure and thermal stability of additive manufactured titanium alloy

首先对激光喷丸作用机理进行了概述;其次回顾了国内外激光喷丸改进增材制造钛合金组织性能的研究现状,在此基础上重点讨论了激光喷丸在增材制造中应用受到限制很大程度是由于存在大量非平衡组织,在热力学作用下会转向平衡态致性能改变;进而总结了目前一些从热力学及动力学上对稳定激光喷丸纳米晶组织所做的尝试及难题,创新提出利用激光喷丸良好扩散性能引入渗氮可析出氮化物、固溶原子等阻碍晶界迁移;最后提出该领域的研究方向以及全面建立增材制造钛合金-激光喷丸-热稳定性数据库以促进本领域发展。

Firstly, the action mechanism of laser shock peening(LSP) is summarized. Then the research status of laser peening to improve the microstructure and properties of titanium alloys additive manufactured at home and abroad is reviewed. On this basis, it is discussed that the limitation of the application of LSP in additive manufacturing is largely due to the existence of a large number of non-equilibrium structures, which will turn to an equilibrium state to change the properties under thermodynamics. Furthermore, some attempts and problems in thermodynamics and kinetics to stabilize the nanocrystalline structure induced by LSP are summarized, and it is innovatively proposed that nitrides and solid solution atoms can be precipitated by nitriding with good diffusion properties of LSP to hinder the migration of grain boundaries. Finally, the future research direction in this field and the establishment of a database of additive manufacturing titanium alloy-LSP-thermal stability are proposed to promote the development of the field.