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针对NC30Fe镍基合金管与1Cr13不锈钢圆柱配副件,采用“十”字交叉接触方式,在改进的PLINT微动试验机上进行交变载荷条件下微动磨损试验.试验环境温度为25℃(air)、300℃(air)和300℃(N2);切向位移幅值为100~200μm,切向微动频率为2 Hz;法向载荷为20和50 N,法向激振频率为10和50 Hz.结果表明:在法向激振力叠加作用下,NC30Fe镍基合金Mises等效应力幅值较静载荷时大,疲劳累积损伤严重,微裂纹更易萌生并扩展.微动疲劳剥落成为磨损中后期主要损伤形式,清洗后磨痕表面形貌呈现大量剥落坑.第三体层形成后具有承载、传递和吸收激振能量作用,三种环境下,第三体层厚度和氧化程度不同,对疲劳剥落作用结果影响较大.
Aiming at NC30Fe nickel-base alloy tube and 1Cr13 stainless steel cylinder, the fretting wear test is carried out on an improved PLINT fretting tester under the condition of alternating load by using “10” cross contact method. The test environment temperature is 25 ℃ (air), 300 ℃ (air) and 300 ℃ (N2). The amplitude of tangential displacement was 100 ~ 200μm, the tangential fretting frequency was 2 Hz, the normal loads were 20 and 50 N, the normal excitation frequency was 10 and 50 Hz respectively.The results show that the Mises equivalent stress amplitude of NC30Fe Ni-base alloy is larger than that under static load, the cumulative fatigue damage is serious and the micro-cracks are easy to sprout and extend under the superposition of normal exciting force. Become the main damage form in the mid-and-late period of abrasion.After washing, the surface morphology of the wear scar presents a large number of peel pits.The third layer has the effect of bearing, transmitting and absorbing excitation energy after the formation of the third layer.The thickness and oxidation degree of the third layer Different, the result of fatigue spalling effect a greater impact.