段煜松,席乃园,李新志,等.TC4钛合金选区激光熔化与层间激光冲击强化复合工艺[J].精密成形工程,2023,15(11):31-38.
DUAN Yu-song,XI Nai-yuan,LI Xin-zhi,et al.Preparation of TC4 Titanium Alloy via Hybrid Additive Manufacturing Process Combining Laser Shock Peening and Selective Laser Melting[J].Journal of Netshape Forming Engineering,2023,15(11):31-38. |
| TC4钛合金选区激光熔化与层间激光冲击强化复合工艺 |
| Preparation of TC4 Titanium Alloy via Hybrid Additive Manufacturing Process Combining Laser Shock Peening and Selective Laser Melting |
| 投稿时间：2023-09-10 |
| DOI：10.3969/j.issn.1674-6457.2023.011.004 |
| 中文关键词: 选区激光熔化 层间激光冲击 TC4合金 缺陷 疲劳寿命 后处理 |
| 英文关键词: selective laser melting interlayer laser shock peening TC4 titanium alloy fatigue life post treatment |
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| 中文摘要: |
| 目的 改善激光选区熔化(Selective Laser Melting，SLM)工艺成形的TC4合金的内部缺陷，提高疲劳寿命。方法 选用TC4钛合金为研究对象，提出了SLM结合层间激光冲击(3D-Laser Shock Peening，3D-LSP)与热处理的强化工艺，对复合制造工艺下的微观组织、内部缺陷和力学性能演变进行了研究，并建立了复合强化工艺制造样品的疲劳寿命模型。结果 在激光冲击影响区域内形成了0.2 mm深度的高幅值残余压应力，并在1 mm深度范围内改善了应力场，且显微硬度得到了提升，内部缺陷数量减少了36%，疲劳寿命提升了40%以上。结论 实现了SLM增材制造TC4钛合金的缺陷在线闭合、微观组织改性和疲劳寿命的提升，揭示了层间激光冲击对内部缺陷的闭合机理，为金属SLM复合增材制造的研究与应用奠定了理论基础。 |
| 英文摘要: |
| The work aims to improve internal defects and fatigue life of TC4 alloy molded by Selective Laser Melting (SLM) process. With TC4 titanium alloy as the research object, a hybrid strengthening process of SLM interlayer laser shocking peening (3D-LSP) and heat treatment was proposed to study the microstructure, internal defects and mechanical properties evolution under the composite manufacturing process, and establish the fatigue life model of the samples manufactured by the composite strengthening process. High-amplitude residual compressive stress was formed at a depth of 0.2 mm, and the stress field was improved at a depth of 1 mm, while the microhardness was increased, the number of internal defects was reduced by 36%, and the fatigue life was increased by more than 40%. This study achieves online defect closure, microstructure customization and fatigue life enhancement of TC4 titanium alloy by SLM composite additive manufacturing and reveals the closure mechanism of internal defects caused by interlayer laser shock peening, further laying the theoretical foundation for the research and application of SLM composite additive manufacturing of metals. |
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