激光重熔对Cu-18Pb-2Sn激光熔覆层组织和性能的影响  

Influence of laser remelting on microstructure and property of Cu-18Pb-2Sn layer prepared by laser cladding

作　　者：邓德伟[1,2] 郑海彤[1] 马玉山 孙奇[2] 张勇[2] 李天澍 赵祥路 DENG De-wei;ZHENG Hai-tong;MA Yu-shan;SUN Qi;ZHANG Yong;LI Tian-shu;ZHAO Xiang-lu(Key Laboratory of Solidification Control and Digital Preparation Technology,School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China;R&D Division of Shenyang Blower Works Group Corporation,Shenyang 110869,China;Wuzhong Instrument Co Ltd,Wuzhong 751100,China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁省凝固控制与数字化制备技术重点实验室,辽宁大连116024 [2]沈阳鼓风机集团股份有限公司研究院,辽宁沈阳110869 [3]吴忠仪表有限责任公司,宁夏吴忠751100

出　　处：《材料热处理学报》2021年第6期140-146,共7页Transactions of Materials and Heat Treatment

基　　金：辽宁重大装备制造协同创新中心基金(DUT2017031);高端控制阀产业技术协同创新中心基金(2018WZ003)。

摘　　要：激光熔覆制备熔覆层后,选用相同功率的激光再次扫描熔覆层对其进行重熔,探究不同激光功率下Cu-18Pb-2Sn激光熔覆层重熔后组织和性能的变化。采用着色探伤法对熔覆层的孔洞缺陷进行检测,利用光学显微镜(OM)、场发射扫描电镜(FE SEM)和X射线衍射仪(XRD)对熔覆层的显微组织、元素分布和物相组成进行检测,使用维氏硬度计测试熔覆层的显微硬度,并采用往复高速摩擦试验机对熔覆层的摩擦磨损性能进行评价。结果表明,相比于未处理的熔覆层,激光重熔后熔覆层内的孔洞数量明显减少,熔覆层组织仍由网状的Pb相和Cu相基体构成,但网状Pb相的数量相对减少,点状Pb相增多。重熔后熔覆层的显微硬度有所上升,平均硬度最高可达到93 HV0.1。试样在摩擦磨损形式下的磨损机理主要为磨粒磨损,激光功率为900、1100、1300和1500 W的熔覆层的平均摩擦系数分别为0.305、0.308、0.296和0.289。The laser remelting of laser cladding Cu-18 Pb-2 Sn layer under the same power with laser cladding was carried out,and the changes of microstructure and properties of the laser cladding Cu-18 Pb-2 Sn layer after laser remelting with different laser powers were investigated.Dye-penetrant inspection was used to detect the porosity of the cladding layer.Microstructure,element distribution and phase component of the cladding layer were studied by means of optical microscopy(OM),field-emission scanning electron microscopy(FESEM)and X-ray diffractometer.Microhardness and wear resistance of the cladding layer were tested by Vickers hardness tester and high speed reciprocating friction testing machine.The results show that compared with the cladding layer without laser remelting,the number of holes in the cladding layer after laser remelting is obviously reduced,and the microstructure of the cladding layer is still composed of reticular Pb phase and Cu phase matrix,but the number of reticular Pb phase is relatively reduced,and point-like Pb phase increases.After laser remelting,the microhardness of the cladding layer increases,and the maximum value of average hardness can reach 93 HV0.1.The wear mechanism of the cladding layer after laser remelting is mainly abrasive wear,and the average friction coefficients of the cladding layers produced under laser powers of 900 W,1100 W,1300 W and 1500 W are 0.305,0.308,0.296 and 0.289,respectively.

关 键 词：激光重熔 铜合金 显微组织 耐磨性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]