Fretting wear behavior and wear mechanism of IN738LC alloy formed by selective laser melting
In this paper,tangential fretting wear experiments on IN738LC alloy produced by SLM technology were carried out using a high-precision fretting friction and wear testing machine(SRV-V)in the point contact mode of ball-on-flat,and the fretting wear behavior of specimens and their wear mechanisms were systematically investigated for different displacement amplitudes(50,100,150 and 200 μm)under constant load conditions(50 N).The results indicate that the friction coefficient and wear volume of the specimen gradually increase with the increase of displacement amplitude.The fretting wear evolves gradually from the mixed fretting regime to the gross slip regime.The wear mechanism for the 50 μm specimen is characterized by slight oxidation wear and fatigue wear,while that of the 200 μm specimen involves oxidation wear,fatigue wear and abrasive wear.Additionally,the distribution of micro-cracks in abrasion mark is significantly reliant on the micro-motion regime type,fretting cracks can occur both at the intersection of adhesion and slip regime and within the gross slip regime.The wear mark shape transforms from circular to oval as a result of the ploughing activity of the mark edges.
NETL
NSTL
万方数据
维普
