为实现直径为0．1 mm微孔的良好封接，采用低功率脉冲激光对0．40 mm厚的工业纯钛（ CP－Ti Grade 1）进行了封焊，采用扫描电镜、显微硬度计及光学显微镜，研究了激光功率对焊缝表面成形、焊接接头横截面形貌和显微硬度的影响规律，分析了接头的微观组织结构．结果表明：当激光功率不低于19．2 W时，微孔可以实现完全封接，且熔核直径随着激光功率的增大而增大，但随着激光功率增大，焊缝凹陷和烧蚀现象越加严重；当激光功率增大时，焊缝表面显微硬度呈上升趋势，激光功率为19．2 W时，焊缝成形良好，且最大显微硬度值可以达到290 HV；焊缝中心微观组织为针状α、锯齿状α以及板条状α晶，焊缝上边缘为锯齿状α晶，而焊缝下边缘为细小的锯齿状α和针状α晶．
Seal welding of 0.40 mm?thick commercially pure grade 1 titanium with 0.1 mm diameter holes was realized using low power impulse laser. The effects of laser power on the weld geometry, cross?section morphology, microhardness and microstructure of the welded joint were studied by using scanning electron microscopy, microhardness tester and optical microscopy. The results show that when the laser power is no less than 19. 2 W, full seal welded joint can be achieved. Nugget size increases whereas welding depression and ablation become more serious with the increase of laser power. Meanwhile, the surface microhardness of the weld bead gradually increases with the increase of laser power. An excellent geometry of the welded joint can be achieved with the maximum microhardness values of 290 HV, when the laser power is 19. 2 W. The microstructure of the welded joint consists of acicularα, serratedα and lathα in the weld center, serratedαon the top edge, and the thin serrated α and fine acicular α on the bottom edge of the welded joint.
参考文献
| [1] | 黄德群.有源植入式医疗器械外壳封装工艺分析[J].中国医疗设备,2009(08):73-75. |
| [2] | A. Pequegnat;Y. D. Huang;M. I. Khan;Y. Zhou.Effects of electrolyte on hardening in laser hole sealing of commercially pure grade 1 titanium[J].Journal of Materials Processing Technology,201210(10):2012-2019. |
| [3] | Y. D. Huang;A. Pequegnat;M. I. Khan;J. C. Feng;Y. Zhou.Laser hole sealing of commercially pure grade 1 titanium[J].Journal of laser applications,20123(3):1-8. |
| [4] | 宁聪琴;周玉.医用钛合金的发展及研究现状[J].材料科学与工艺,2002(1):100-106. |
| [5] | 黄永德 .316L不锈钢与Pt-Ir合金丝微连接工艺及机理[D].哈尔滨工业大学,2012. |
| [6] | 邹贵生;闫剑锋;母凤文;吴爱萍;Zhou Y.Norman;白海林;任家烈.微连接和纳连接的研究新进展[J].焊接学报,2011(4):107-112. |
| [7] | 张华;程东海;黄继华;赵兴科;陈树海.TC4钛合金激光焊接/超塑成形组合工艺研究[J].材料科学与工艺,2013(4):32-36. |
| [8] | 黄永德;何鹏;林铁松;冯吉才;Y.Norman Zhou.铂铱合金与316L不锈钢微激光点焊气孔形成机理[J].稀有金属材料与工程,2013(10):2079-2082. |
| [9] | 蔡重阳.电子封装结构演变与微连接技术的关系[J].电子与封装,2014(01):11-14,18. |
| [10] | 王志彬;贺虎;陈萌炯;黄三玻;王训春.太阳电池阵新型互连片微连接技术探讨[J].航天器环境工程,2015(1):104-107. |
| [11] | 张向东;郝胜智;高泰瑞;董闯.强流脉冲电子束处理纯钛的表面组织与性能[J].核技术,2011(1):22-26. |
| [12] | 崔丽;李晓延;贺定勇;沓名宗春.工业纯钛光纤激光-MIG复合焊接工艺及性能[J].焊接学报,2009(11):33-36. |
| [13] | 刘冰;周清;瞿瑞锋;常王桃.CP-Ti和Ti-0.2Pd合金的显微组织对其耐蚀性的影响[J].中国有色金属学报,2015(4):959-966. |
| [14] | 倪聪;石岩;陈俊科;蒋士春;刘佳.工业纯钛板激光焊接工艺研究[J].应用激光,2015(2):212-215. |
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