(哈尔滨工业大学 现代焊接生产技术国家重点实验室，
哈尔滨 150001)
摘 要: 以Ti-6Al-4V薄板材料为研究对象， 研究了激光弯曲成形技术在钛合金上的应用特征。通过实验描述了不同扫描参数对弯曲角的影响规律， 并对多次扫描下的板材弯曲动态特性进行了研究。 结果表明： 弯曲角随扫描次数呈近似的线性增加关系； 在扫描次数一定的情况下，存在一个最优的累积线能量使弯曲角达到最大； 不同的材料状态在加热和冷却过程呈现出不同的弯曲动态特性。 此外， 对激光弯曲后的材料微观组织、 力学性能进行了测量和分析。结果表明： 扫描参数的选择对发生相变的区域形状与相变区组织有较大影响； 多次扫描后， 加热区材料的强度与硬度均增加， 塑性降低。
关键字: 钛合金； 激光弯曲； 累积线能量； 微观组织
（State Key Laboratory of Advanced Welding and Production Technology,
Harbin Institute of Technology, Harbin 150001, China）
Abstract: Laser forming technology was employed in bending of Ti-6Al-4V sheets and the process characteristic was investigated. The influence of different laser scanning parameters on bending angle and the process dynamic behaviors were analyzed. The results indicate that the increase of bending angle with the scanning numbers is almost linear. Under the constant bending times, the biggest bending angle can be obtained with an optimal accumulative line energy value. Different dynamic bending behaviors with different material states during the heating and cooling process were observed. Moreover, the microstructure and the mechanical property of the material in heated area were measured and analyzed. The results show that the geometry and the microstructure of phase change zone are affected by scanning parameters, and the material tensile strength and hardness in heated area increase, while the plastic property decreases.
Key words: titanium alloy; laser bending; accumulative line energy; microstructure
