摘要
为了进一步提高激光原位熔覆层的质量,利用激光重熔方法对TC4钛合金表面激光原位熔覆层进行了处理。采用扫描电镜(SEM)、X射线衍射仪(XRD)和显微硬度计分别对比研究了熔层的显微组织、相分布和显微硬度。结果表明,适当工艺参数的激光重熔处理可以消除位于原位熔覆层底部的大气孔,可以使熔层中的陶瓷相分布更均匀,从而提高熔层的组织致密性;激光重熔处理后熔层硬度值的梯度变化减弱,熔层的平均显微硬度与质量的稳定性均得到提高。
In order to improve the in-situ synthesized coating quality by laser cladding,in-situ laser cladding coating on TC4 titanium alloy surface is processed by laser remelting.Microstructure,phase,and microhardness of the coatings are studied by scanning electron microscope（SEM）,X-ray diffractometer（XRD） and micro-hardness tester.The results show that the pore of in-situ coating bottom is eliminated and the ceramic phase of coating is distributed homogeneously by laser remelting so that microstructure becomes denser.After laser remelting,the microhardness gradient is reduced.The average microhardness and coating quality are enhanced by laser remelting.
出处
《激光与光电子学进展》
CSCD
北大核心
2012年第4期106-112,共7页
Laser & Optoelectronics Progress
基金
湖南省自然科学基金(05JJY300092)
湖南省教育厅科学研究项目(09C856)资助课题
关键词
激光技术
激光熔覆
激光重熔
TC4钛合金
显微组织
laser technique
laser cladding
laser remelting
TC4 titanium alloy
microstructure
