重熔时间对热喷焊件疲劳寿命及磨损性能的影响  

Effects of remelting time on fatigue life and wear performance of thermal spray welding components

作　　者：赵志平[1,2] 李有堂[2] 李新勇[1] 

机构地区：[1]兰州工业学院基础学科部,甘肃兰州730050 [2]兰州理工大学机电工程学院,甘肃兰州730050

出　　处：《材料热处理学报》2013年第7期169-174,共6页Transactions of Materials and Heat Treatment

基　　金：甘肃省教育厅基础研究项目(0612B-04)

摘　　要：采用粉末火焰喷焊技术制备了以40Cr为基体,Ni60A镍基自熔性合金粉末为涂层材料的试样,利用疲劳试验机及摩擦磨损试验机研究了经不同重熔时间处理后试样的弯扭疲劳寿命及耐磨损性能,并采用扫描电子显微镜(SEM)、能谱分析(EDS)、显微硬度计及非接触三维表面轮廓仪对涂层的磨损形貌、组织成分、表面硬度进行了分析。结果表明:合理的重熔时间长度为10 min。当重熔时间合理时,热喷焊件弯扭疲劳性能最强、涂层表面硬度最高、耐磨损能力最强。当重熔时间长度不合理时,涂层中Cr元素的偏析、SiO2颗粒物的生成等因素均显著影响了涂层的微观组织结构,降低了涂层件的疲劳寿命及耐磨损能力。Specimens with Ni-based self-fluxing alloy coatings on 40Cr steel substrate were prepared by thermally spraying.Wear resistance and torsion fatigue property of the coated samples,for which the coatings were remelted for different time,were investigated by wear tester and fatigue testing machine,respectively.Morphology,phase components and hardness of the coating layer were examined by means of scanning electron microscopy（SEM）,energy dispersive X-ray spectrometer（EDS） analysis and micro-hardness tests,and a non-contact three-dimensional profilemeter was used to observe the morphology of the worn coatings.The results show that the optimum remelting time is 12 min,and the performance of combined bending and torsion fatigue of thermal spray welding specimens,wear resistance and surface hardness of the coatings are excellent.The microstructure of the coatings is influenced significant by Cr segregation,SiO2 particles formed by Si reacted with oxygen when the un-proper remelting time is employed,and the fatigue performance of the samples and the wear resistance of the coatings decrease.

关 键 词：火焰热喷焊 弯扭疲劳 涂层硬度 摩擦磨损 组织成分 

分 类 号：TG115.5[金属学及工艺—物理冶金]