中国激光, 2013, 40 (2): 0203001, 网络出版: 2012-11-22
激光冲击强化对激光焊接件气蚀行为的影响
Effects of Laser Shock Processing on Cavitation Erosion Resistance of Laser Weldments
激光技术 激光冲击强化 抗气蚀性能 激光焊接件 laser technique laser shock processing cavitation erosion resistance laser weldments
摘要
采用高能激光束对厚板激光焊接件进行激光冲击强化(LSP)处理,并利用X射线衍射仪(XRD)、显微硬度仪、高精度电子天平和扫描电镜(SEM)观察分析手段研究了激光冲击强化对激光焊接件抗气蚀性能的影响。试验结果表明,增加激光冲击强化脉冲能量气蚀后,激光焊接件马氏体强度相对提高、马氏体剥落得到抑制,表面和横截面硬度增加,累积质量损失和表面气蚀破坏面积减小。随着激光能量的增加,马氏体晶粒细化,气蚀后表面起伏组织变浅、变疏,表面裂纹萌生扩展得到减缓抑制,因此激光焊接件抗气蚀性能增强。另外,激光焊接件焊缝区的抗气蚀性能优于热影响区(HAZ)的抗气蚀性能。
Abstract
Effects of laser shock processing (LSP) on cavitation erosion behaviors of ANSI 304 stainless steel thick sheets treated by laser welding are investigated. Mechanical properties and microstructure of laser weldments are measured and observed by X-ray diffraction (XRD), microhardness, electronic balance and scanning electron microscope (SEM) tests in order to investigate cavitation erosion resistance of laser weldments. Results show that with the increment of LSP pulse energies after cavitation erosion, the martensite intensity is improved relatively and the removal of martensite is restrained, the hardness increases, and the cumulative mass loss and damaged surface areas of laser weldments decrease. Meanwhile, the martensite grains are fined, and undulations and upheavals become shallower and sparser, and the growth and propagation of the cracks on the surface are restrained. Thus, cavitation erosion resistance of laser weldments is enhanced. In addition, cavitation erosion resistance of laser welding zone (LWZ) is better than that of heat-affected zone (HAZ).
张磊, 罗开玉, 鲁金忠, 张永康, 冯爱新. 激光冲击强化对激光焊接件气蚀行为的影响[J]. 中国激光, 2013, 40(2): 0203001. Zhang Lei, Luo Kaiyu, Lu Jinzhong, Zhang Yongkang, Feng Aixin. Effects of Laser Shock Processing on Cavitation Erosion Resistance of Laser Weldments[J]. Chinese Journal of Lasers, 2013, 40(2): 0203001.