Inconel600合金高温微动磨损特性

采用SRV-Ⅳ高精度微动磨损试验机研究核电材料Inconel600合金的高温微动磨损行为和机制.温度升高有利于黏着区的形成,抑制微滑区的产生,促使摩擦系数和磨损量逐渐减小.摩擦氧化主要发生在环状滑动区,中心黏着区相对很少.高温下氧元素分布较室温下的更加聚集.中心黏着区表面氧含量较低,表层大量存在Ni、Cr和Fe的单质.磨痕表面氧化物由NiO、Cr₂O₃和Fe₃O₄组成.室温和高温条件下磨痕表面中心黏着区和环状滑动区交界处产生了微裂纹,高温下裂纹萌生在微滑区,与室温下相比,高温下裂纹萌生的数量更少,长度更短.

Fretting wear properties of Inconel600 alloy at high temperature

Fretting test was carried out using an SRV-Ⅳ fretting test rig in order to investigate the fretting behavior and mechanism of Inconel 600 alloy at high temperature. The results indicate that high temperature is beneficial to the formation of an adhesion zone,but restrain the generation of a micro-sliding zone. The friction coefficient and wear loss decrease with the increase of temperature. Friction oxidation mainly occurs in the sliding zone of wear scars,while there is little oxidation in the adhesion zone. Oxygen concentration in the sliding zone at high temperature is more obvious than that at room temperature. At the center of the adhesion region,the oxygen content is low and there is a lot of single Ni,Cr and Fe. At the wear scar surface,the oxides are composed of NiO,Cr₂O₃ and Fe₃O₄. At both room temperature and high temperature,microcracks are usually found in the sliding/adhesion junction zone,while the position of crack initiation at high temperature is in the micro-sliding zone. However,the number and length of cracks at high temperature are less than those at room temperature.