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  本文關(guān)鍵詞： WC-10Co-4Cr涂層 CoCrW涂層 超音速火焰噴涂 微動磨損　出處：《西南交通大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：核電系統(tǒng)中,由于流體的運(yùn)輸和能量的傳遞,引起蒸汽發(fā)生器傳熱管與其支撐板之間發(fā)生微小的振動,而導(dǎo)致微動損傷。持續(xù)的微動磨損過程,常伴隨表層裂紋的萌生和擴(kuò)展,加劇微動損傷,進(jìn)而可能會引起傳熱管爆裂事故,嚴(yán)重影響核電系統(tǒng)的安全運(yùn)行。在傳熱管的支撐接觸部位涂覆高溫耐磨涂層,可以提高傳熱管的抗微動損傷性能,這對于保障核電系統(tǒng)安全性具有重要意義。本文研究了在Incone1690合金管表面超音速火焰噴涂WC-10Co-4Cr和CoCrW兩種涂層的微動磨損特性。兩種涂層材料和Incone1690合金管分別與實心圓柱體對磨副剛玉以“十”字交叉接觸方式,在PLINT微動磨損試驗機(jī)上進(jìn)行試驗研究。選擇的試驗條件為：法向載荷Fn為100～200N,位移幅值D為100～200μm,頻率.f為2 Hz,循環(huán)次數(shù)為10000次,常溫條件。在已有的數(shù)據(jù)基礎(chǔ)上,結(jié)合掃描電子顯微鏡(SEM)、光學(xué)顯微鏡(OM)、電子能譜儀(EDX)、X射線衍射儀(XRD)、NanoMap500DLS雙模式輪廓儀和三維共聚焦顯微鏡(OLYMPUS-OLS4100)等分析手段。對兩種涂層和Incone1690合金在滑移區(qū)的微動磨損特性和損傷機(jī)理進(jìn)行了研究分析,得出了以下結(jié)論：(1)法向載荷一定時,涂層和Incone1690合金材料的摩擦系數(shù)隨著位移幅值的增加而變大；在相同試驗條件下(Fn=200 N,D=150μm,f=2 Hz),WC-10Co-4Cr、CoCrW涂層和Incone1690的穩(wěn)態(tài)摩擦系數(shù)分別為.0.56、0.59和0.93。(2)兩種涂層的耐磨性顯著優(yōu)于Incone1690合金；WC-10Co-4Cr涂層的耐磨性優(yōu)于CoCrW。(3)兩種涂層以磨粒磨損和剝層為主要特征的磨損機(jī)制；而Incone1690合金管則是以粘著磨損和磨粒磨損為主要特征。(4)Incone1690合金及兩種涂層的磨痕剖面,可清晰顯示基體層、塑性變形層和磨屑層等三層結(jié)構(gòu)。
[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.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TG174.4

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