322 Prakt. Met. Sonderband 46 (2014) 
3.2 
By the 
areas 
area Ic 
2mm i 
Fig. 1: Cross Section of failure position. Source: Institute de Soudure 
3. INVESTIGATION OF THE FRACTURE SURFACE 
The fracture surface was investigated macroscopic by photographic documentation, using 
Zeiss Stereo Microscope (LMS), and Scanning Electron Microscopy (SEM) LEO 1450 VP 
(Zeiss) 
Follow 
which 
towarc 
70um. 
These 
samp! 
Fig. 2: Fracture Surface after forced fracture under liquid nitrogen as received (left) and 
after deoxidation (right) 
33 © 
3.1 DEOXIDATION OF THE FRACTURE SURFACE The mr 
failure 
As shown in Fig. 2 (left) the original fracture surfaces received are covered with heavy entire 
corrosion products (rust) which prevent the full access to the original fracture surface from By ap 
which information about the mechanism of the causes and development of the fracture can to the 
be achieved. be obs 
By the application of the Fe R2 Method [1] the corrosion layer could be fully removed can b« 
without any degradation of the micro-topographic condition of the fracture surface. All called 
details which represent the surface condition of the fracture surface can be maintained by failure 
application of that method. optime 
weldir