Inconel690合金表面HVOF喷涂CoCrW和WC-10Co-4Cr涂层的微动磨损特性研究

发布时间：2018-01-20 06:49

本文关键词： WC-10Co-4Cr涂层 CoCrW涂层超音速火焰喷涂微动磨损　出处：《西南交通大学》2016年硕士论文　论文类型：学位论文

【摘要】：核电系统中,由于流体的运输和能量的传递,引起蒸汽发生器传热管与其支撑板之间发生微小的振动,而导致微动损伤。持续的微动磨损过程,常伴随表层裂纹的萌生和扩展,加剧微动损伤,进而可能会引起传热管爆裂事故,严重影响核电系统的安全运行。在传热管的支撑接触部位涂覆高温耐磨涂层,可以提高传热管的抗微动损伤性能,这对于保障核电系统安全性具有重要意义。本文研究了在Incone1690合金管表面超音速火焰喷涂WC-10Co-4Cr和CoCrW两种涂层的微动磨损特性。两种涂层材料和Incone1690合金管分别与实心圆柱体对磨副刚玉以“十”字交叉接触方式,在PLINT微动磨损试验机上进行试验研究。选择的试验条件为：法向载荷Fn为100～200N,位移幅值D为100～200μm,频率.f为2 Hz,循环次数为10000次,常温条件。在已有的数据基础上,结合扫描电子显微镜(SEM)、光学显微镜(OM)、电子能谱仪(EDX)、X射线衍射仪(XRD)、NanoMap500DLS双模式轮廓仪和三维共聚焦显微镜(OLYMPUS-OLS4100)等分析手段。对两种涂层和Incone1690合金在滑移区的微动磨损特性和损伤机理进行了研究分析,得出了以下结论：(1)法向载荷一定时,涂层和Incone1690合金材料的摩擦系数随着位移幅值的增加而变大；在相同试验条件下(Fn=200 N,D=150μm,f=2 Hz),WC-10Co-4Cr、CoCrW涂层和Incone1690的稳态摩擦系数分别为.0.56、0.59和0.93。(2)两种涂层的耐磨性显著优于Incone1690合金；WC-10Co-4Cr涂层的耐磨性优于CoCrW。(3)两种涂层以磨粒磨损和剥层为主要特征的磨损机制；而Incone1690合金管则是以粘着磨损和磨粒磨损为主要特征。(4)Incone1690合金及两种涂层的磨痕剖面,可清晰显示基体层、塑性变形层和磨屑层等三层结构。
[Abstract]:In nuclear power system, due to fluid transportation and energy transfer, small vibration occurs between the heat transfer tube of steam generator and its supporting plate, which leads to fretting damage and sustained fretting wear process. Often accompanied by the initiation and expansion of surface cracks, the fretting damage may be aggravated, which may lead to the explosion of heat transfer pipe, and seriously affect the safe operation of nuclear power system. The high temperature wear-resistant coating is applied on the supporting contact part of the heat transfer pipe. It can improve the fretting damage resistance of heat transfer tube. It is of great significance to ensure the safety of nuclear power system. The microstructures of WC-10Co-4Cr and CoCrW coatings sprayed by supersonic flame on the surface of Incone1690 alloy tube have been studied in this paper. Dynamic wear characteristics. Two coating materials and Incone1690 alloy tubes, respectively, for grinding corundum with solid cylinders. Ten "cross contact mode." The experimental study was carried out on a PLINT fretting wear tester. The test conditions were as follows: normal load F _ n is 100m ~ 200N, displacement amplitude D is 100m ~ (200 渭 m). The frequency. F is 2 Hz, the number of cycles is 10000, the normal temperature condition. On the basis of the available data, combined with scanning electron microscope (SEM), optical microscope (OM). Electron energy spectrometer (EDX / X ray diffractometer XRD). NanoMap500DLS double mode profilometer and 3D confocal microscope OLYMPUS-OLS4100). The fretting wear characteristics and damage mechanism of two kinds of coatings and Incone1690 alloys in slip zone were studied. The following conclusion is drawn: when the normal load is constant, the friction coefficient between the coating and the Incone1690 alloy material increases with the increase of displacement amplitude. Under the same test conditions, the FnC200 Nu DU 150 渭 m FG 2HzCZN WC-10Co-4Cr is obtained. The steady-state friction coefficient of CoCrW coating and Incone1690 is 0.56, respectively. The wear resistance of the two coatings is better than that of Incone1690 alloy. The wear resistance of WC-10Co-4Cr coating is better than that of CoCrW. 3) the wear mechanism of the two coatings is mainly characterized by abrasive wear and delamination. On the other hand, Incone1690 alloy tube is characterized by adhesive wear and abrasive wear. The wear trace profile of the alloy and two coatings can clearly display the substrate layer. Plastic deformation layer and debris layer are three-layer structure.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG174.4

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