激光技术, 2019, 43 (4): 460, 网络出版: 2019-07-10   

激光参量对血管支架重铸层及热影响区的影响

Effect of laser parameters on recasting layer and heat affected zone of cardiovascular stents
作者单位
山东理工大学 机械工程学院, 淄博 255049
摘要
为了探究光纤微秒激光加工中关键工艺参量对心血管支架重铸层和热影响区的形成机理及变化趋势, 采用了基于不同单因素参量下光纤微秒激光切割316L医用不锈钢的实验方法。通过进行理论分析和实验验证, 得到了单因素参量下316L心血管支架的实物模型及其热影响区及重铸层的检测数据。结果表明, 重铸层厚度主要受脉冲宽度及激光功率影响, 随脉冲宽度和脉冲功率的增大而增大, 当脉宽为20μs时, 最小重铸层厚度为3.0μm; 热影响区厚度与脉冲宽度、脉冲频率、激光功率、切割速率有关, 即随脉冲宽度及脉冲频率的增大而增大,随功率的增大先增大后减小,随切割速率的增大先减小后增大, 当脉冲频率为5000Hz时,最小热影响区厚度为0.2μm。通过研究316L心血管支架重铸层及热影响区的形成机理及变化趋势, 为后续的正交实验及抛光实验奠定了基础。
Abstract
In order to explore the formation mechanism and the changing trend of recast layer and heat affected zone (HAZ) of cardiovascular stents induced by key technological parameters in optical fiber microsecond laser processing, experimental method of cutting 316L medical stainless steel by optical fiber microsecond laser based on different single factor parameters was adopted. Through theoretical analysis and experimental verification, the physical model of 316L cardiovascular stent and the detection data of HAZ and recast layer were obtained under single factor parameters. The results show that the thickness of recast layer is mainly affected by pulse width and laser power. It increases with the increase of pulse width and power. The minimum thickness of recast layer is 3.0μm when the pulse width is 20μs. The thickness of HAZ is related to pulse width, pulse frequency, laser power and cutting rate. It increases with the increase of pulse width and frequency. With the increase of power, it increases first and then decreases. With the increase of cutting rate, it decreases first and then increases. When pulse frequency is 5000Hz, the minimum HAZ thickness is 0.2μm. The study of the formation mechanism and trend of recast layer and HAZ of 316L cardiovascular stents gives a foundation for subsequent orthogonal and polishing experiments.

张晋烨, 张海云, 李志永, 孙晓宇, 王永琪. 激光参量对血管支架重铸层及热影响区的影响[J]. 激光技术, 2019, 43(4): 460. ZHANG Jinye, ZHANG Haiyun, LI Zhiyong, SUN Xiaoyu, WANG Yongqi. Effect of laser parameters on recasting layer and heat affected zone of cardiovascular stents[J]. Laser Technology, 2019, 43(4): 460.

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