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