激光表面熔凝对镍铝青铜组织演变和空蚀行为的影响  

Effect of laser surface melting on microstructure evolution and cavitation behavior of nickel aluminum bronze

作　　者：曾思琪 田静静 胡树兵[1] 肖明 彭博[1] Si-qi ZENG;Jing-jing TIAN;Shu-bing HU;Ming XIAO;Bo PENG(State Key Laboratory of Material Processing and Die and Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学材料科学与工程学院,材料成形与模具技术国家重点实验室,武汉430074

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第7期2090-2109,共20页中国有色金属学报（英文版）

基　　金：financially supported by the Major State Basic Research Development Program of China (No.2020YFB2010304);the National Natural Science Foundation of China (No.92066202)。

摘　　要：采用激光表面熔凝对镍铝青铜进行表面强化以提高其抗空蚀性能。通过XRD、SEM和TEM等手段对微观结构进行表征,并在超声空泡试验机上进行空泡测试。结果表明:采用功率为3 kW和扫描速度为10mm/s的激光参数时,耐蚀性和抗空蚀性能较铸态合金得到提高。熔凝处理过程中晶粒细化强化、位错强化和析出相强化的协同强化机制以及均匀组织消除选相腐蚀主导了熔凝后镍铝青铜的抗空蚀性能。The laser surface melting was employed on the nickel aluminum bronze to augment the cavitation performance.To investigate the effect of laser treatment,the microstructure was characterized by X-ray diffraction,scanning electron microscopy,and transmission electron microscopy.And the cavitation behavior was tested on an ultrasonic vibratory machine.The results show that the optimal process parameter with laser power of 3 kW and scanning speed of 10 mm/s contributes to the increased corrosion resistance and reduced cavitation mass loss,compared with the cast sample,respectively.The enhancement of the cavitation resistance is dominated by the synergistic mechanism of grain refinement strengthening,dislocation strengthening,and precipitate strengthening,with the homogeneous structure eliminating selective corrosion.

关 键 词：镍铝青铜 激光表面熔凝 析出相 位错 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG146.11[一般工业技术—材料科学与工程]