F- Chen et aL/ Engineering Failure Analysis 37(2014)29-41 a SE1 20m cBdax3zgenesisgenmaps spe 01-Jur-21s KEnt 1002003.004005.006,007,008.009.00100 Fig. 13. EDS analysis of the wear zone(a)deposit morphology(b)EDS analysis of the deposit. EDS results of the deposit. The main cause of the thinning of this titanium tube was still the improper processing of the internal borings as well as the sagging of corrosion products on the vertical support plates into the internal borings. But as we know, the grindings and corrosion products can only result in fine and shallow wear traces as in the first case. Hence the deep and wide furrow crack must have been created by larger and harder particles. It is highly possible that foreign hard particles were left in the condenser during inspection and repair. Some of these particles were brought into the internal borings by airflow. Under the undulation of water and steam during operation, the hard particles moved irregularly on the tube surface. The force erted on the particles by the inner wall of the internal borings pressed them into the surface of the tube in the vertical direction and led to the relative motion between them in the horizontal direction. The particles pushed titanium to both sides and forward, leaving deep furrow cracks on the tube surface. This was the three-body contact wear between the outer wall of the tube the hard particles and the internal boring.The main cause of the thinning of this titanium tube was still the improper processing of the internal borings as well as the sagging of corrosion products on the vertical support plates into the internal borings. But as we know, the grindings and corrosion products can only result in fine and shallow wear traces as in the first case. Hence the deep and wide furrow crack must have been created by larger and harder particles. It is highly possible that foreign hard particles were left in the condenser during inspection and repair. Some of these particles were brought into the internal borings by airflow. Under the undulation of water and steam during operation, the hard particles moved irregularly on the tube surface. The force exerted on the particles by the inner wall of the internal borings pressed them into the surface of the tube in the vertical direction and led to the relative motion between them in the horizontal direction. The particles pushed titanium to both sides and forward, leaving deep furrow cracks on the tube surface. This was the three-body contact wear between the outer wall of the tube, the hard particles and the internal boring. Fig. 13. EDS analysis of the wear zone (a) deposit morphology (b) EDS analysis of the deposit. Table 3 EDS results of the deposit. Element O Ti Fe Wt% 28.74 3.86 67.40 F.-J. Chen et al. / Engineering Failure Analysis 37 (2014) 29–41 39