(哈爾濱工業(yè)大學(xué) 現(xiàn)代焊接生產(chǎn)技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，
哈爾濱 150001)
摘 要: 以Ti-6Al-4V薄板材料為研究對(duì)象， 研究了激光彎曲成形技術(shù)在鈦合金上的應(yīng)用特征。通過(guò)實(shí)驗(yàn)描述了不同掃描參數(shù)對(duì)彎曲角的影響規(guī)律， 并對(duì)多次掃描下的板材彎曲動(dòng)態(tài)特性進(jìn)行了研究。 結(jié)果表明： 彎曲角隨掃描次數(shù)呈近似的線性增加關(guān)系； 在掃描次數(shù)一定的情況下，存在一個(gè)最優(yōu)的累積線能量使彎曲角達(dá)到最大； 不同的材料狀態(tài)在加熱和冷卻過(guò)程呈現(xiàn)出不同的彎曲動(dòng)態(tài)特性。 此外， 對(duì)激光彎曲后的材料微觀組織、 力學(xué)性能進(jìn)行了測(cè)量和分析。結(jié)果表明： 掃描參數(shù)的選擇對(duì)發(fā)生相變的區(qū)域形狀與相變區(qū)組織有較大影響； 多次掃描后， 加熱區(qū)材料的強(qiáng)度與硬度均增加， 塑性降低。
關(guān)鍵字: 鈦合金； 激光彎曲； 累積線能量； 微觀組織
（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
