690合金与1Cr13不锈钢及其爆炸喷涂WC-25Co涂层高温微动磨损特性研究

发布时间：2018-06-23 12:45

  本文选题：微动磨损 + 高温　； 参考：《西南交通大学》2012年硕士论文

【摘要】：微动通常指两固体接触面之间发生的极小位移的相对运动。由于微动主要是由于微观偶然振动引起的,这种无征兆的微动损伤积累下来将会对机械零件造成灾难性的损伤。流体流动导致的在蒸汽发生器传热管与支撑板处的小幅运动积累下来便会导致蒸汽发生器传热管的微动磨损失效。尽管前人做了很多工作,时至今日也没有一种系统解决蒸汽发生器传热管微动磨损失效的办法。 本文在PLINT微动磨损试验机上以“管/平面”接触方式分别进行了“690合金管/1Cr13不锈钢”及“690合金管/爆炸喷涂WC-25Co涂层”的微动磨损试验。分析了两种不同摩擦配副的摩擦三维特性曲线、摩擦系数曲线,测量了两种不同摩擦配副之间的磨损体积,利用光学显微镜、扫描电子显微镜观察了其磨痕形貌,探究了两种不同摩擦配副之间的微动磨损机理。主要结论如下： (1)位移幅值对690合金/1Cr13不锈钢、690合金/WC-25Co涂层摩擦系数影响较小；法相载荷对摩擦系数影响较大,体现在随着法相载荷的增大690合金/1Cr13不锈钢、690合金/WC-25Co涂层摩擦系数随之增大。 (2)位移幅值及法向载荷对690合金/1Cr13不锈钢及690合金/WC-25Co涂层的微动磨损特性有重要影响。随着位移及载荷的增大,690合金/1Cr13不锈钢、690合金/WC-25Co涂层磨损量均增大。 (3)温度对690合金/1Cr13不锈钢磨损体积的影响体现在,200℃时磨损体积最大,300℃磨损体积居中,室温25℃磨损体积最小；而690合金/WC-25Co涂层则随着温度的升高,磨损体积随之减少。 (4)室温条件下,690合金的磨损机理为磨粒磨损和剥层的共同作用,1Cr13不锈钢的磨损机理为磨粒磨损、塑性变形以及剥层,WC-25Co涂层磨损机理为磨粒磨损；高温条件下,磨损机理分别为690合金-氧化磨损、粘着磨损、剥层,1Cr13不锈钢-氧化磨损、塑性变形、剥层,WC-25Co为磨粒磨损。 (5)690合金/WC-25Co涂层配副时在各种工况条件下的磨损体积均小于690合金/1Cr13不锈钢,由此可得出结论,在蒸汽发生器传热管支撑板材料1Cr13不锈钢上通过爆炸喷涂制备WC-25Co涂层能有效降低SG传热管因微动磨损而导致的损伤。
[Abstract]:Fretting usually refers to the relative motion of a minimal displacement between two solid contact surfaces. Since fretting is mainly caused by microcosmic accidental vibration, the accumulation of this kind of fretting damage without warning will cause disastrous damage to mechanical parts. The accumulation of small motion between the heat transfer tube and the supporting plate of the steam generator caused by fluid flow will lead to the fretting wear failure of the heat transfer tube of the steam generator. Although much work has been done, there is no systematic method to solve the fretting wear failure of steam generator tube. In this paper, the fretting wear tests of "690 alloy tube / 1Cr13 stainless steel" and "690 alloy tube / explosive sprayed WC-25Co coating" have been carried out on the PLINT fretting wear tester. The friction characteristic curves and friction coefficient curves of two kinds of friction pairs were analyzed. The wear volume between two kinds of friction pairs was measured. The wear marks were observed by optical microscope and scanning electron microscope. The mechanism of fretting wear between two different friction pairs was investigated. The main conclusions are as follows: (1) the displacement amplitude has little effect on the friction coefficient of 690 alloy / 1Cr13 stainless steel alloy / WC-25Co coating, and the normal phase load has a great effect on the friction coefficient. The friction coefficient of 690 alloy / 1Cr13 stainless steel / WC-25Co coating increases with the increase of normal phase load. (2) displacement amplitude and normal load have important influence on fretting wear characteristics of 690 alloy / 1Cr13 stainless steel and 690 alloy / WC-25Co coating. With the increase of displacement and load, the wear volume of WC-25Co coating / 1Cr13 stainless steel alloy / WC-25Co coating increases. (3) the effect of temperature on wear volume of 690 alloy / 1Cr13 stainless steel is in the middle of the maximum wear volume of 300 鈩，

本文编号：2057167