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首页> 美国卫生研究院文献>Materials >The Evolution of Fretting Wear Behavior and Damage Mechanism in Alloy 690TT with Cycle Number
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The Evolution of Fretting Wear Behavior and Damage Mechanism in Alloy 690TT with Cycle Number

机译：具有循环次数的690TT合金微动磨损行为及损伤机理的演变

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摘要

The evolution of fretting wear behavior and damage mechanism in Alloy 690TT with cycle number was investigated via laser scanning confocal microscopy (LSCM), scanning electron microscopy (SEM), focus ion beam (FIB), and transmission electron microscopy (TEM). The results showed that the fretting running status underwent a transition from partial slip and mixed stick-slip to final gross slip with the transformation of Ft–D curves from the ellipse to the parallelogram. The coefficient of friction (COF) experienced three drops throughout the fretting process, which indicated the transformation from high-friction wear to low-friction wear. The first drop was due to the transition from two-body to three-body contact. The second and third drops were mainly related to the evolution of the glaze layer from a localized distribution to completely covering the whole contact surface. The competition between fretting induced fatigue cracking (FIF) and fretting induced wear (FIW) ran through the entire fretting wear process. Before the 1.2 × 10 th cycle, the fatigue crack growth was faster than wear, and FIF won the competition. As the fretting cycle continued to increase, the wear velocity was obviously faster than that of FIF, which indicated that FIW defeated FIF. The tribologically transformed structure (TTS) participated in the competition between FIF and FIW. The gain boundaries and dislocations in the TTS were a suitable pathway for crack initiation and propagation and oxygen permeation.
机译：通过激光扫描共聚焦显微镜（LSCM），扫描电子显微镜（SEM），聚焦离子束（FIB）和透射电子显微镜（TEM）研究了690TT合金在循环次数下的微动磨损行为和损伤机理。结果表明，随着Ft–D曲线从椭圆形变为平行四边形，微动运行状态经历了从部分滑移和混合粘滑滑移到最终总滑移的过渡。在整个微动过程中，摩擦系数（COF）经历了三滴下降，这表明从高摩擦磨损到低摩擦磨损的转变。第一次下降是由于从两体接触转变为三体接触。第二滴和第三滴主要与釉层从局部分布到完全覆盖整个接触表面的演变有关。微动引起的疲劳裂纹（FIF）和微动引起的磨损（FIW）之间的竞争贯穿于整个微动磨损过程。在1.2×10周期之前，疲劳裂纹的增长快于磨损，FIF赢得了竞争。随着微动周期的增加，磨损速度明显快于FIF，这表明FIW击败了FIF。摩擦变形结构（TTS）参与了FIF和FIW之间的竞争。 TTS中的增益边界和位错是裂纹萌生，扩展和氧气渗透的合适途径。

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