不同表面处理工艺的40Cr与涂层复合处理的组织与性能

发布时间：2018-07-07 07:38

  本文选题：强流脉冲电子束 + 离子氮化　； 参考：《重庆理工大学》2015年硕士论文

【摘要】：齿轮作为在机械装备中重要基础部件之一,得到了广泛的应用。由于工作中受到弯曲应力、接触应力、冲击力等多种力的综合作用,齿轮极易产生失效而影响齿轮传动的稳定性、可靠性和寿命。根据统计,齿轮失效导致的各种机械故障占到60%以上,齿轮的应用环境复杂、载荷复杂,导致齿轮的失效形式也是多种多样。随着机械工业高速发展,齿轮技术向高速、重载、高可靠性方向发展,这就对齿轮性能提出更高的要求,开展齿轮材料和齿轮表面改性的研究成为重要的研究方向。课题主要对典型的中碳合金调质钢40Cr进行研究,在对40Cr基体渗氮的基础上进行物理气相沉积TiN、TiAlN涂层以及与强流脉冲电子束相结合的复合工艺,研究离子氮化40Cr表面沉积TiN、TiAlN涂层、电子束照射后表面沉积TiN、TiAlN涂层和电子束照射后表面沉积TiN、TiAlN涂层再电子束照射的组织与性能特征。经过研究可以得到以下结果:(1)离子氮化后物理气相沉积TiAlN与TiN涂层均匀致密、厚度均匀,与基体结合良好,Ti N涂层主要组成是TiN与Ti2N,TiAlN涂层则主要由Fe4N、(Ti,Al)N和TiN等相组成。TiAlN和TiN的表面硬度分别达到3000HV0.2和2700HV0.2,比氮化表面高3倍多,TiAlN与TiN涂层结合力分别为17N和15N。(2)离子氮化40Cr表面沉积TiN、TiAlN涂层工艺,TiAlN的磨损量最低,在载荷15N时为离子氮化磨损量的32%,TiN的磨损量为离子氮化磨损量的58%;在相同的加载条件下,TiAlN涂层磨痕宽度均匀,TiN磨痕边缘涂层变形与剥落更加明显,涂层磨损严重。(3)40Cr经电子束在27kV不同次数照射后,表面产生典型的“熔坑”形貌,随着次数的增加熔坑数量呈先减少再增大的趋势,经过电子束照射和未经电子束照射XRD检测物相结果表明,电子束照射后出现新的物相γ-Fe,电子束照射后镀膜的物相主要是由TiAlN、TiN、AlN组成。(4)电子束照射后表面沉积TiN、TiAl N涂层,在27kV、45次时磨损体积最大为39.475×10-3mm3,在27kV、25次最小为24.11×10-3mm3。在27kV、25次电子束照射下的残余应力为495.5MPa,27kV、25次照射后涂覆TiAlN的残余应力值为27.4MPa。电子束照射后的阳极极化曲线表明自腐蚀电流密度最小的是2号样也就是27kV、5次,说明2号样的耐蚀性能是最好的。电子束照射后镀膜的阳极极化曲线结果表明在27kV、35次参数下Icorr4=0.652μA/cm2说明试样耐蚀性能是最好。(5)电子束照射后表面沉积TiN、TiAlN涂层再电子束照射工艺40Cr表面涂覆TiN经过15kV、5次电子束照射后的截面组织膜层与未照射状态相比厚度减薄,膜层连续,经过18kV5次照射后的截面涂层不连续。(6)40Cr表面涂覆TiN和TiAlN涂层后经过电子束照射后摩擦磨损的磨损体积,40Cr表面涂覆TiN涂层在18kV、5次时磨损体积最小为10.961×10-3mm3。40Cr表面涂覆TiAlN涂层在21kV、5次时最小为10.256×10-3mm3。
[Abstract]:As one of the important basic parts in mechanical equipment, gear has been widely used. Due to the combined action of bending stress, contact stress, impact force and other forces, gear is prone to failure, which affects the stability, reliability and life of gear transmission. According to statistics, all kinds of mechanical faults caused by gear failure account for more than 60%, the application environment of gear is complex, the load is complex, and the failure forms of gear are also varied. With the rapid development of mechanical industry, gear technology develops to high speed, heavy load and high reliability, which puts forward higher requirements for gear performance. It is an important research direction to carry out the research on gear material and gear surface modification. In this paper, the typical medium carbon alloy quenched and tempered steel 40Cr was studied. Based on the nitriding of 40Cr substrate, the physical vapor deposition of TiN- TiAlN coating and the combination of TiAlN coating with high current pulsed electron beam were carried out to study the TiN- TiAlN coating deposited on the 40Cr surface by ion nitridation. The microstructure and properties of TiN- TiAlN coating after electron beam irradiation and TiN- TiAlN coating after electron beam irradiation were studied. The results are as follows: (1) after ion nitriding, TiAlN and tin coatings are uniform and dense, and the thickness is uniform. The surface hardness of tin and tin is 3000HV0.2 and 2700HV0.2 respectively, which is more than three times higher than that of nitrided surface. The bonding force between tin and tin coating is 17N and 15N, respectively. The coating process of TiAlN on the surface of 40Cr by ion nitridation is the lowest, and the wear rate of TiAlN is the lowest. When the load is 15 N, the wear amount of 32% tin is 58% of the amount of ion nitrided wear, and under the same loading conditions, the wear trace width of TiAlN coating is uniform, and the deformation and spalling of the edge coating of tin wear mark are more obvious. The coating wear is serious. (3) when 40Cr is irradiated by electron beam at 27kV for different times, the surface of 40Cr produces a typical "melting pit" morphology, and with the increase of the number of times, the number of melting pits decreases first and then increases. The results of X-ray diffraction and electron beam irradiation showed that a new phase 纬 -Fe appeared after electron beam irradiation, and the coating was mainly composed of TiAlN, TiN and AlN. (4) TiN- TiAlN coating was deposited on the surface after electron beam irradiation. The maximum wear volume is 39.475 脳 10 ~ (-3) mm ~ (-3) at 45 times and 24.11 脳 10 ~ (-3) mm ~ (-3) at 27 kV ~ (25) times. The residual stress of TiAlN coating is 27.4MPa after 25 times of electron beam irradiation, and the residual stress is 495.5 MPA ~ (27) KV ~ (2 +). The anodic polarization curve after electron beam irradiation shows that the minimum corrosion current density is the second sample, that is, 27 kV ~ (-1) for 5 times, which indicates that the corrosion resistance of sample 2 is the best. The anodic polarization curve of the coating after electron beam irradiation shows that the corrosion resistance of the sample is the best under the parameters of 27kV ~ (35) times Icorr _ 4N _ (0.652) 渭 A/cm2. (5) after electron beam irradiation, tin coating on 40Cr surface is coated with tin after 15 kV ~ (5) times of electric irradiation. (5) after electron beam irradiation, tin coating is deposited on the surface of TiAlN coating and then irradiated by electron beam. The thickness of the cross-section tissue film after sub-beam irradiation was thinner than that of the non-irradiated state. The film is continuous, (6) the wear volume of 40Cr coated with tin and TiAlN coating after electron beam irradiation is different. (6) the wear volume of 40Cr coated with tin coating is 10.961 脳 10 ~ (-3) mm ~ (3) mm ~ (40) Cr and the wear volume is 10.961 脳 10 ~ (-3) mm ~ (3) mm ~ (40) Cr at 18 kV ~ (5) times. The minimum value is 10.256 脳 10 ~ (-3) mm ~ (-3) at 21 kV ~ (-1) 5 times.
【学位授予单位】：重庆理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG174.4

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