Hardness test on part 4 as below...
From the analysis of the photo the micro structure and the violence / hardness test in the area 4 pipe damaged can be inferred:
1 Defect happened because of a conflict from the outside so plastic deformation occurs. Plastic deformation allegedly happened at a high temperature ( above a recrystallization ), because seen no change the micro structure occurring significantly.
2 The results of the violence / hardness test also show the possibility of a conflict at high temperatures where the value of violence / hardness tends to decline.
3 Of the results of a photograph of SEM visible cracks that happened due to plastic deformation.
4 From the EDX found indications of those compounds from outside the pipe as al2o3 4 , sio2 , fe2o3 that might exist or attached to objects that hit pipes 4 .
Pictures 3.30 is passage in a tubular 3 that experienced rips. Appear to be any differences in the hues deposit around the area rips. The XRD analysis done in three locations such as can be seen in such a figure.
The results of the analysis XRD pipe 3 was in this picture 3.31 until a picture 3.33, as well as table 3.8 up to table 3.10.
Of the analysis result of XRD it is evident that there is a fine coating deposit vary in several locations. This indicates that such a possibility a crack that happened was long enough. Hematite , magnesium and calcium hydroxide carbonat is deposit of a kind of water-formed deposits
to be continue to Boiler Tube Research Part 6.
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