摘要
针对农业触土部件因耐磨性能差、冲击韧性低而导致刀具寿命短、失效频繁等问题,采用等离子堆焊技术在Q235钢基材上成功制备了Fe/WC/CeO_(2)金属陶瓷复合涂层,分析了CeO_(2)对Fe/WC/CeO_(2)金属陶瓷复合涂层性能的影响及其对涂层的作用机理。以堆焊电流、堆焊速度、送粉速率、堆焊距离为试验因素,磨损量为评价指标,通过正交试验优化了Fe/WC/CeO_(2)等离子堆焊层制备工艺参数:堆焊电流50 A,堆焊距离5 mm,堆焊速度15 cm/min,送粉速率25 g/min。利用扫描电子显微镜、X射线衍射仪、能谱仪分析了堆焊层显微组织、物相组成,采用维氏显微硬度计、摩擦磨损试验机、冲击试验机、土槽试验台等测试了堆焊层显微硬度、耐磨性和冲击韧性,利用电化学工作站分析了堆焊层的耐蚀性。结果表明,堆焊层与基体呈良好的冶金结合,涂层主要有鱼骨状、长杆状、球状、六方形状等组织构成,堆焊层主要由γ-Fe、Fe-Cr-Ni固溶体、WC、M_(7)C_(3)、Cr_(7)C_(3)、Cr_(23)C_(6)、W_(2)C等物相组成。与Fe/WC堆焊层相比,Fe/WC/CeO_(2)堆焊层平均显微硬度提高22%,冲击韧性提高29%。土槽试验与田间试验表明,与65Mn旋耕刀相比,Fe/WC/CeO_(2)堆焊层旋耕刀的磨损量分别降低71%和65%;与Fe/WC堆焊层旋耕刀相比,Fe/WC/CeO_(2)堆焊层旋耕刀的磨损量分别降低17%和15%。Fe/WC/CeO_(2)堆焊层具有较好的耐磨、耐蚀和耐冲击综合性能,研究结果可为犁铧、深松铲等农业触土部件强化提供参考。
This study aims to improve the wear resistance,impact toughness,and free of frequent failure of contacting parts with soil in the agricultural machinery.A Fe/WC/CeO_(2) ceramic composite coating was prepared on the Q235 steel substrate by plasma surfacing technology.An analysis was also made to clarify the influence of the CeO_(2) compound on the wear resistance of Fe/WC cermet composite coating and the action mechanism.An orthogonal test was used to optimize the preparation process parameters of the Fe/WC/CeO_(2) plasma surfacing layer,where the surfacing current,surfacing speed,powder feeding rate,and powder feeding distance were taken as the test factors and the wear quality as the evaluation index.Specifically,the welding current was 50 A,welding distance 5 mm,welding speed 15 cm/min,and power transport rate 25 g/min.The microstructure and phase composition of the surfacing layer were characterized by a scanning electron microscope,energy dispersive spectrometer(EDS),and X-ray diffractometer(XRD).The results showed that there was an outstanding interface between the surfacing layer and the matrix bonding zone,indicating that the surfacing layer and matrix permeated each other to form an excellent metallurgical bonding.The size of the hard phase in the surfacing layer decreased outstandingly in presence of a dispersion distribution,particularly with the shape like a fishbone,long rod,ball,and hexagonal.The surfacing layer was composed ofγ-Fe,Fe-Cr-Ni solid solution,WC,M_(7)C_(3),Cr_(7)C_(3),Cr_(23)C_(6),and W_(2)C.The carbide hard phase(such as WC,Cr_(7)C_(3),and Cr_(23)C_(6))was effectively improved the hardness and wear resistance of the surfacing layer.In addition,the addition of CeO_(2) decarbonized the WC hard phase to form W_(2)C hard phase for better wear resistance.The Vickers microhardness tester,friction and wear testing machine and impact testing machine were used to measure the microhardness,wear resistance,and impact toughness of the surfacing layer.The corrosion resistance was also analyzed by a
作者
郝建军
占志国
侯俊英
赵建国
刘敬春
殷常峰
Hao Jianjun;Zhan Zhiguo;Hou Junying;Zhao Jianguo;Liu Jingchun;Yin Changfeng(College of Mechatronical and Electrical Engineering,Hebei Agricultural University,Baoding 071001,China;Technology Innovation Center of Intelligent Agricultural Equipment,Hebei Provincial,Baoding 071001,China;Key Laboratory of Cutting Tools for Agricultural Machinery,Hebei Provincial,Dingzhou 073000,China;Shandong Xutuo New Material Technology Co.,LTD.,Weifang 261000,China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2021年第24期1-8,共8页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家重点研发计划(2017YFD0300907)。
关键词
显微结构
性能
等离子堆焊
堆焊层
旋耕刀
microstructure
performance
plasma surfacing
surfacing layer
rotary blade
