Abstract
Mechanical components such as steam turbine blades may experience heavy damage when subjected to repeated impingement of liquid droplets. In order to evaluate the erosion damage quantitatively, a high-speed erosion test rig utilizing water droplets was used to study the erosion resistance of 12Cr steel, cobalt base alloy and titanium alloy. From the experimental results, it reflects that erosion does not proceed at a constant rate. The characteristic erosion-time curve consists four stages : the incubation period, the acceleration period, the deceleration period, and the steady-state region. In this paper, a universal curve fitting approach is proposed in an attempt to define this erosion process. With optimal values of the five main parameters, it may be possible to more closely correlate the experimental data with the proposed model. Furthermore, the relation-ships among these parameters, impact velocity, droplet diameter and material hardness are discussed, and a prediction method of erosion resistance is presented.
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